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Exploration Geophysics
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  The Journal of the Australian Society of Exploration Geophysicists
 
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Exploration Geophysics presents case histories, advances in data interpretation, and theoretical developments in applied geophysics. More

Managing Editor: Mark Lackie

 
 
 

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Published online 23 June 2016
Improved reservoir characterisation using fuzzy logic platform: an integrated petrophysical, seismic structural and poststack inversion study 
Muhammad Kamran Jafri, Aref Lashin, El-Khedr Hassan Ibrahim, Kamal A. Hassanein, Nassir Al Arifi and Muhammad Naeem

In this study, petrophysical properties, seismic structural and poststack seismic inversion results are integrated using the fuzzy logic AND operator to characterise the Tensleep Sandstone Formation at Powder River Basin, Wyoming, USA. The 3D seismic cube and logging datasets of 17 wells are used for enhancing the seismic and petrophysical evaluation.

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Published online 10 June 2016
The amplitude and phase of the derivatives of the magnetic anomalies of thin dykes and contacts 
Gordon R. J. Cooper

If the horizontal and vertical derivatives of the total field magnetic anomalies of thin dykes and contacts are put into an amplitude-phase form, then this can aid in their interpretation. In addition, the relationships between local wavenumber and source-distance semi-automatic interpretation methods are clarified.

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Published online 09 June 2016
Simultaneous seismic interpolation and denoising based on sparse inversion with a 3D low redundancy curvelet transform 
Jingjie Cao and Jingtao Zhao

This paper introduces a low redundancy curvelet transform which can reduce the redundancy to 10 for three dimensional data and simultaneously interpolate and denoise. Numerical experiments on synthetic and field data demonstrate that the low redundancy transform can provide reliable results while at the same time improving the computational efficiency.

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Published online 08 June 2016
New insights into the North Taranaki Basin from New Zealand’s first broadband 3D survey 
Marjosbet Uzcategui, Malcolm Francis, Wai Tin Vincent Kong, Richard Patenall, Dominic Fell, Andrea Paxton and Tristan Allen

The North Taranaki Basin contains widespread (2D) seismic coverage and numerous wells. The basin hydrocarbon potential remains unproven. An active petroleum system is confirmed by hydrocarbon shows and non-commercial oil and gas discoveries (Karewa-1 and Kora-1). 3D seismic interpretation and amplitude-versus-offset (AVO) analysis support the renewed potential of the basin.

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Published online 08 June 2016
Adaptive mixed-norm seismic inversion for non-Gaussian errors 
Zhiyong Li, Guangmin Hu and Jiashu Zhang

Subsurface-property estimation from remote geophysical measurements is subject to non-Gaussian errors. We propose to minimise the misfit with a robust error measure, which is based on a generalised Gaussian distribution. A suboptimal solution is proposed through a mixed-norm functional combination of the l1 and l2 norms.

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Published online 06 June 2016
Three-dimensional inversion of in-line resistivity data for monitoring a groundwater recharge experiment in a pyroclastic plateau 
Keisuke Inoue, Hiroomi Nakazato, Tomijiro Kubota, Mutsuo Takeuchi, Yoshihiro Sugimoto, Hee Joon Kim and Koji Furue

An artificial groundwater recharge experiment was conducted in a pyroclastic plateau in Kagoshima Prefecture in Japan, and time-efficient in-line resistivity surveys were performed along four intersecting lines. The zones of decreased resistivity shifted with time, indicating non-uniform penetration of water from the recharge areas and a horizontal flow of the recharged water.

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Published online 03 June 2016
Ground resistivity method and DCIP2D forward and inversion modelling to identify alteration at the Midwest uranium deposit, northern Saskatchewan, Canada 
Samuel R. M. Long, Richard S. Smith and Robert B. Hearst

Forward and inverse modelling are used to demonstrate that the resistivity method can detect alteration above the Midwest uranium deposit in Canada. The inverse section of the field data is similar to the inverse section of a synthetic model when alteration is present, but dissimilar when there is no alteration.

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Published online 02 June 2016
A Monte Carlo approach to constraining uncertainties in modelled downhole gravity gradiometry applications 
Samuel J. Matthews, Craig O'Neill and Mark A. Lackie

In this paper, we describe the utilisation of numerical models to simulate the downhole application of gravity gradiometry in order to benchmark the impact of a density contrast at depth, with specific application to monitor a density contrast consistent with the sequestration of CO2 displacing brine water in an abandoned oil reservoir.

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Published online 02 June 2016
Near-surface high resolution imaging of a metallogenic zone in the northern fringe of Dalma volcanics in eastern India using electrical resistivity tomography 
P. K. Adhikari, P. K. Yadav, Shalivahan Srivastava, Ved P. Maurya, Shailendra Singh, Anurag Tripathi, Roshan K. Singh and Ashish K. Bage

An ERT survey was conducted over a defined conducting zone through a magnetotelluric survey in the Dalma volcanics, India. The resistivity models resolved four major zones and the results corroborate well with the geological succession. The resistivity values of less than 1 Ωm at a depth of ~25 m correspond to the deposit.

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Published online 31 May 2016
Microtremor exploration for shallow S-wave velocity structure in Bandung Basin, Indonesia 
Andi Muhamad Pramatadie, Hiroaki Yamanaka, Kosuke Chimoto, , Kazuki Koketsu, Minoru Sakaue, Hiroe Miyake, I Wayan Sengara and Imam A. Sadisun

We obtained the shallow S-wave velocity profile distributions in the Bandung Basin, Indonesia, from the inversion of the observed Rayleigh wave phase velocity spectra using a microtremor survey. The profiles will be used for calculation of the average S-wave velocity of the upper 30 m and site amplification factors for seismic hazard evaluation in the area.

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Published online 30 May 2016
Joint inversions of two VTEM surveys using quasi-3D TDEM and 3D magnetic inversion algorithms 
Vlad Kaminski, Domenico Di Massa and Andrea Viezzoli

We present the results of a joint quasi-3D inversion of two VTEM datasets, flown over a VMS-Au prospect in northern Ontario, Canada, six years apart from one another. The TDEM data were inverted jointly using the spatially constrained inversion (SCI) approach and verified against known geology.

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Published online 20 May 2016
New comprehensive standard seismic noise models and 3D seismic noise variation for Morocco territory, North Africa, obtained using seismic broadband stations 
Younes El Fellah, Abd El-Aziz Khairy Abd El-Aal, Mimoun Harnafi and Antonio Villaseñor

New comprehensive seismic noise models and 3D seismic noise variation are constructed for Morocco, North Africa, using 23 broadband stations. The results bring a new perception to noise models and can be considered as a significant contribution. This study supplements the Peterson models and allows future permanent stations to be sited in Morocco.

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Published online 20 May 2016
Discovery of the Eureka volcanogenic massive sulphide lens using downhole electromagnetics 
Jacob Paggi and Daniel Macklin

The Eureka massive sulphide lens forms part of the Stockman Project in north-east Victoria. Eureka was discovered in early 2013, combining the interpretation of two subtle downhole electromagnetic anomalies with a robust geological model, with additional support from short-wave infrared and structural modelling.

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Published online 12 May 2016
Divergence correction schemes in finite difference method for 3D tensor CSAMT in axial anisotropic media 
Kunpeng Wang, Handong Tan, Zhiyong Zhang, Zhiqiang Li and Meng Cao

This paper presents a study on divergence correction in the finite difference method for 3D tensor controlled-source audio-frequency magnetotellurics (CSAMT) in an axial anisotropic media. We show how divergence correction can be performed more efficiently and the study results can be used to help accelerate a whole 3D tensor CSAMT forward modelling and inversion.

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Published online 10 May 2016
Microtremor exploration for shallow S-wave velocity profiles at stations in local strong motion network in Bursa, Yalova, and Kocaeli in north-western Turkey 
Özgür Tuna Özmen, Hiroaki Yamanaka, Kosuke Chimoto, Ulubey Çeken, Mehmet Akif Alkan, Kudret Tekin and Erkan Ateş

We conducted microtremor array surveys for shallow Vs profiles at strong motion stations in Bursa, Yalova and Kocaeli provinces in Turkey. The Vs profiles to a depth of 100 m were deduced from Rayleigh wave phase velocities in frequencies from 1 to 30 Hz. Site amplification factors were discussed with the profiles.

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Published online 05 May 2016
An experimental study of Rayleigh waves based on seismoelectric measurements 
Ziying Xiong, Zhengping Liu and Kai Zhang

Rayleigh wave experiments were performed in homogeneous and lateral inhomogeneous models using acoustic and seismoelectric measurements, respectively. The experimental results suggest a potential application of the seismoelectric conversion effect to improve spatial resolution and meet the requirement of dispersion measurement in the laboratory acoustic experiments involving Rayleigh waves.

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Published online 02 May 2016
Amplification characteristics of seismic observation sites from S-wave energy, coda waves and background noise from the Fukuoka earthquake series 
Jun Kyoung Kim, Tae Seok Oh, Seong Hwa Yoo and Soung Hoon Wee

This study applied a method that uses the H/V spectral ratio of ground motions to analyse site amplification characteristics. Its application was extended to S-waves, coda waves, and background noise. Analysis of data at seismic stations in Korea suggested consistent site amplification characteristics among the three types of seismic energies despite a logarithmic difference in the Fourier transform values.

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Published online 02 May 2016
A time-frequency analysis method to obtain stable estimates of magnetotelluric response function based on Hilbert-Huang transform 
Jianhua Cai

Based on the Hilbert-Huang transform, a time-frequency analysis method is proposed to obtain stable estimates of the magnetotelluric response function. The response function estimation is performed in the time-frequency domain using instantaneous spectra rather than in the frequency domain, which allows for imaging the response parameter content as a function of time and frequency.

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Published online 20 April 2016
3D numerical modelling of negative apparent conductivity anomalies in loop-loop electromagnetic measurements: a case study at a dacite intrusion in Sugisawa, Akita Prefecture, Japan 
Ame Thato Selepeng, Shin'ya Sakanaka and Tadashi Nishitani

Under certain geological conditions, low induction number electromagnetic instruments are known to produce negative apparent conductivity responses. This is particularly the case when the subsurface is characterised by highly conductive bodies. We present 3D numerical modelling results of dacite dike intrusions in Sugisawa, Akita Prefecture, Japan.

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Published online 20 April 2016
Fast residual static correction method using first arrivals in the 3D shot–receiver united domain 
Meng Zou, Qiang Zhou, Luming Li, Rui Zhu and Kun Luo

We introduce a residual static correction method using first arrivals. Since we fit and smooth the first breaks in a 3D shot–receiver united domain, this method has a lower sensitivity to first arrivals and performs better than traditional methods.

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Published online 14 April 2016
Passive airborne EM and ground IP\resistivity results over the Romero intermediate sulphidation epithermal gold deposits, Dominican Republic 
Jean M. Legault, Jeremy Niemi, Jeremy S. Brett, Shengkai Zhao, Zihao Han and Geoffrey C. Plastow

The Romero gold-copper-zinc-silver deposits in the Dominican Republic are of the intermediate sulphidation epithermal type. Ground IP\resistivity results are compared to ZTEM passive airborne electromagnetics over the deposit region. The ZTEM results show good correlation with ground IP\resistivity results and identify a previously unknown deep (>500 m) continuity between the Romero deposits.

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Published online 05 April 2016
Gravity, magnetic and resistivity investigations of the Okauia Low Temperature Geothermal System in alluvial sediments of the Hauraki Depression, New Zealand 
Supri Soengkono and Robert Reeves

Gravity, ground magnetics, DC resistivity and TDEM measurements are used to delineate the near-surface extent of the Okauia Low Temperature Geothermal System, New Zealand. Potential permeable pathways mapped by the geophysical surveys are consistent with the geological environment.

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Published online 01 April 2016
Rapid depth estimation for compact magnetic sources using a semi-automated spectrum-based method 
Roger Clifton

An object program provides hands-on searching through magnetic survey data. The power spectrum is remapped on-screen so that any isolated compact body appears as a straight line in a spectrum of depths. Results are typically noisy, so facilities are provided to change parameters to track down an elusive depth signal.

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Published online 01 April 2016
Statics correction methods for 3D converted-wave (PS) seismic reflection 
Shaun Strong and Steve Hearn

An analysis of three approaches for estimating 3D PS statics is presented. These include a surface-consistent inversion algorithm, PPS refraction statics, and a robust statistical method. This analysis is achieved through the use of synthetic models, and a coal-scale 3D-3C survey acquired in the Bowen Basin.

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Published online 23 March 2016
Testing cluster analysis on combined petrophysical and geochemical data for rock mass classification 
Maria C. Kitzig, Anton Kepic and Duy T. Kieu

We demonstrate the usefulness of fuzzy clustering for semi-automated rock mass classification and the importance of data preconditioning prior to analysis. We also show the impact of choosing different subsets and combinations of the available data on the classification result.

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Published online 18 March 2016
The discovery and geophysical response of the Atlántida Cu–Au porphyry deposit, Chile 
Matthew Hope and Steve Andersson

We provide detailed geophysical characterisation of porphyry style Cu-Au mineralisation of the Atlántida project, located under 25–80 m post-mineral gravels of the Atacama Desert, Northern Chile. Clear geological controls on the geophysical signatures of the deposit are resolved via the use of petrophysical studies and incorporation of drill testing results.

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Published online 16 March 2016
An efficient waveform inversion using the common mid-point gather in the wavenumber-space-time domain 
Yunhui Park and Sukjoon Pyun

We introduce an efficient waveform inversion algorithm using common mid-point gathers. Since we perform both modelling and inversion in the wavenumber-space-time domain, it recovers only a one-dimensional velocity model. However, we can build a two-dimensional velocity model with moderate dips by assuming that reflectors are locally flat.

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Published online 10 March 2016
VTEM airborne EM, aeromagnetic and gamma-ray spectrometric data over the Cerro Quema high sulphidation epithermal gold deposits, Panama 
Karl Kwan, Alexander Prikhodko, Jean M. Legault, Geoffrey C. Plastow, John Kapetas and Michael Druecker

In March 2012, a helicopter-borne VTEM survey was flown over the Cerro Quema high sulphidation (HS) epithermal gold deposits. The geophysical data obtained were analysed for geophysical signatures characteristic of HS epithermal gold deposits. The success of this survey points to the applicability of EM-Mag-Spec surveys for the exploration of similar deposits.

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Published online 16 February 2016
Fast inversion of gravity data using the symmetric successive over-relaxation (SSOR) preconditioned conjugate gradient algorithm 
Zhaohai Meng, Fengting Li, Xuechun Xu, Danian Huang and Dailei Zhang

We describe a new fast gravity inversion method to recover a 3D density model from gravity data. This gravity inversion method introduces a stabiliser model norm with a depth weighting function to produce smooth models and uses a new symmetric successive over-relaxation (SSOR) iterative conjugate gradient (CG) algorithm.

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Published online 12 February 2016
Gas hydrate saturation and distribution in the Kumano Forearc Basin of the Nankai Trough 
Jihui Jia, Takeshi Tsuji and Toshifumi Matsuoka

The spatial distribution and characteristics of gas hydrates in the Kumano Forearc Basin of the Nankai Trough were investigated by using logging data and 3D seismic data. This study demonstrates that tectonic activity of the underlying accretionary prism at the plate convergent margin is responsible for hydrate formation.

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Published online 05 February 2016
Obtaining high-resolution velocity spectra using weighted semblance 
Saleh Ebrahimi, Amin Roshandel Kahoo, Milton J. Porsani and Ali Nejati Kalateh

Accuracy and resolution of velocity spectra are very important in seismic data processing, as they have considerable impact on the quality of the final seismic section. We improve the accuracy and resolution of velocity spectra by introducing two weighting functions to the traditional semblance velocity analysis.

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Published online 05 February 2016
Airborne gravity gradiometer surveying of petroleum systems under Lake Tanganyika, Tanzania 
Doug Roberts, Priyanka Roy Chowdhury, Sharon Jenny Lowe and Asbjorn Norlund Christensen

An airborne gravity gradiometry and high-resolution aeromagnetic survey conducted in Lake Tanganyika within the East African Rift System has been interpreted to demonstrate sedimentary sequences and structures prospective for petroleum. Numerous play types analogous to the Lake Albert oil discoveries further north in Uganda are revealed by further surveys.

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Published online 29 January 2016
Forward modelling of spectral depths using 3D Fourier convolution 
Roger Clifton

3D Fourier convolution is a fast method for forward modelling irregular magnetic bodies. A kernel consisting of the field of a single dipole, convolved over a random distribution of dipoles, simulates the heterogeneity of bulk material. A demonstration studies the depth information collected by different survey parameters.

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Published online 27 January 2016
Converted-wave guided imaging condition for elastic reverse time migration with wavefield separation 
Hyungwook Choi, Soon Jee Seol and Joongmoo Byun

Polarity reversals and cross-talk noises, which degrade the converted wave images (P-S, S-P, and S-S images) of elastic reverse time migration (ERTM), are addressed. To overcome these problems, we derive a new P-S converted wave imaging condition for ERTM based on wavefield separation techniques.

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Published online 21 January 2016
Helicopter AFMAG (ZTEM) EM and magnetic results over sedimentary exhalative (SEDEX) lead-zinc deposits at Howard’s Pass in Selwyn Basin, Yukon 
Jean M. Legault, Ali Latrous, Shengkai Zhao, Nasreddine Bournas, Geoffrey C. Plastow and Gabriel Guang Xue

In 2008, a ZTEM natural field EM and magnetic survey was flown over the world-class, >250 Mt SEDEX deposits at Howard’s Pass in the Selwyn Basin, Yukon. The AEM data provide insights into regional structures and intrusions. They also reveal a correlation between enhanced conductivity along strike and the clustering of deposits at Howard’s Pass.

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Published online 20 January 2016
Electromagnetic exploration in high-salinity groundwater zones: case studies from volcanic and soft sedimentary sites in coastal Japan 
Koichi Suzuki, Yukiko Kusano, Ryota Ochi, Nariaki Nishiyama, Tomochika Tokunaga and Kazuhiro Tanaka

In order to evaluate the freshwater–saltwater interface of three sample areas in the Chugoku-Shikoku region of western Japan, we conducted CSAMT surveys at locations with varying hydrogeological features, and performed laboratory tests to measure the electrical properties of rock core samples from each site.

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Published online 20 January 2016
Fast first arrival picking algorithm for noisy microseismic data 
Dowan Kim, Joongmoo Byun, Minho Lee, Jihoon Choi and Myungsun Kim

We have developed a new fast picking method, optimised for noisy microseismic data, using cross-correlation and stacking. In experiments with synthetic data and field data, this method produces reliable results and the computation time is dramatically reduced.

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Published online 13 January 2016
3D inversion of total magnetic intensity data for time-domain EM at the Lalor massive sulphide deposit 
Dikun Yang and Douglas W. Oldenburg

3D voxel inversion of HeliSAM data at the Lalor massive sulphide deposit suffers from: (1) contamination of early-time data by the near-surface infrastructure and (2) creation of a mathematically acceptable but non-geologic model from inversion of late-time data. We propose a procedure that incorporates the infrastructure in our inversion, and a warm-start approach to overcome the non-uniqueness.

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Published online 23 December 2015
Comparison of artificial absorbing boundaries for acoustic wave equation modelling 
Yingjie Gao, Hanjie Song, Jinhai Zhang and Zhenxing Yao

We provide a thorough review of all typical absorbing boundary conditions and derive their equations in a uniform mathematical form. We examine their performance via numerical experiments and qualitatively show their advantages and disadvantages. Finally, we provide some suggestions on choosing different boundary conditions for practical applications.

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Published online 23 December 2015
Automatic first-arrival picking based on extended super-virtual interferometry with quality control procedure 
Shengpei An, Tianyue Hu, Yimou Liu, Gengxin Peng and Xianghao Liang

We have developed an automatic first-arrival picking method that combines extended super-virtual interferometry with quality control. The field data examples show that the proposed method yields stacked sections of similar quality to those obtained by laborious and costly manual picking.

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Published online 22 December 2015
3D joint inversion of gravity-gradient and borehole gravity data 
Meixia Geng, Qingjie Yang and Danian Huang

We perform 3D joint inversion of surface and borehole data using cokriging. The examples presented demonstrate that the method is remarkable in its ability to include the geological information and physical property. Also, both depth and horizontal resolution of the recovered model can be improved by joint inversion.

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Published online 11 December 2015
Automatic detection of multiple UXO-like targets using magnetic anomaly inversion and self-adaptive fuzzy c-means clustering 
Gang Yin, Yingtang Zhang, Hongbo Fan, Guoquan Ren and Zhining Li

A method for automatically detecting UXO-like targets based on magnetic anomaly inversion and self-adaptive fuzzy c-means clustering is proposed. Magnetic anomaly inversion methods are used to estimate the initial locations of targets. The self-adaptive fuzzy c-means clustering algorithm is then used to cluster these initial locations, giving the number and locations of magnetic targets.

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Published online 29 October 2015
A seismic diffraction extraction method for the study of discontinuous geologies using a regularisation algorithm 
Caixia Yu, Yanfei Wang and Jingtao Zhao

By considering two constraints from the Sobolev penalty function and the difference operator, we have developed an optimised regularisation model for extracting seismic diffractions. An efficient iterative method based on projection onto a convex set has been developed to solve the minimisation problem. The proposed method has high-resolution capability for detecting small-scale discontinuities.

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Published online 27 October 2015
Azimuthal AVO signatures of fractured poroelastic sandstone layers 
Zhiqi Guo and Xiang-Yang Li

Frequency-dependent seismic responses from a fractured sandstone layer show complex azimuthal variations due to anisotropic propagation and attenuation of transmission waves associated with fluid flow. It would be practical to investigate wavetrains reflected from the fractured layers that are regarded as integrated units.

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Published online 26 October 2015
Acquisition, processing and interpretation of high-resolution seismic data using a small-scale multi-channel system: an example from the Korea Strait inner shelf, south-east Korea 
Dong-Geun Yoo, Nam-Hyung Koo, Ho-Young Lee, Byoung-Yeop Kim, Young-Jun Kim and Snons Cheong

The results of the present study show that a small-scale multi-channel seismic system is an effective way to improve the quality of seismic records and to document the evolution of shallow sediment deposits. The shelf deposits in the Korea Strait inner shelf consist of three distinct seismic units formed during the late Quaternary.

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Published online 01 October 2015
Initialising reservoir models for history matching using pre-production 3D seismic data: constraining methods and uncertainties 
Mohammad Emami Niri and David E. Lumley

A fundamental step in reservoir characterisation and modelling is the preconditioning of the initial reservoir model to honour both the geological knowledge and seismic data. In this paper, we analyse the issues that have significant impact on the (mis)match of the reservoir model with well logs and inverted seismic data.

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Published online 17 September 2015
Joint elastic and petrophysical inversion using prestack seismic and well log data 
Zhiyong Li, Beibei Song, Jiashu Zhang and Guangmin Hu

We present a strategy for the joint estimation of elastic and petrophysical properties from prestack seismic data based on Gassmann equations with deterministic optimisation techniques. Given poor-quality prestack seismic data, two regularisation parameters are introduced to control the trade-off between fidelity to the data and the smoothness of the solution.

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Published online 13 August 2015
An efficient hybrid scheme for fast and accurate inversion of airborne transient electromagnetic data 
Anders Vest Christiansen, Esben Auken, Casper Kirkegaard, Cyril Schamper and Giulio Vignoli

We present a hybrid inversion scheme for airborne TEM data that introduces approximation only in the calculation of partial derivatives. The objective function is evaluated with a full nonlinear one-dimensional (1D) forward model.

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Published online 28 July 2015
Tools used in mineral exploration for measuring the conductivity and the resistivity in drillholes and on drill core: observations on their range of sensitivity 
Devon Parry, Richard S. Smith and Omid Mahmoodi

We investigated the range of sensitivity of five tools for measuring the conductivity or resistivity in drillholes and on drill core. Each tool has a limited range of sensitivity, so one or more tools should be used to cover the range of values expected on a particular project.

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Published online 22 July 2015
A simple method for depth determination from self-potential anomalies due to two superimposed structures 
El-Sayed M. Abdelrahman, Eid R. Abo-Ezz, Tarek M. El-Araby and Khalid S. Essa

A method to determine the depth to two superimposed sources from a self-potential anomaly profile has been developed. The method uses a relationship between the depths to the two superimposed structures determined from a combination of observations at symmetric points with respect to the coordinate of the sources’ centre.

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blank image Exploration Geophysics
Volume 47 Number 2 2016

 
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Table of Contents 
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The distortion tensor of magnetotellurics: a tutorial on some properties 
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Frederick E. M. Lilley
pp. 85-99

The magnetotelluric distortion tensor is analysed by two methods of linear algebra: eigenvalue analysis and singular value decomposition. Mohr diagrams display the results, and emphasise important characteristics of the distortion. Examples compare traditional Groom-Bailey decomposition with singular value decomposition.

   |        Open Access Article
 

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Correction of magnetotelluric static shift by analysis of 3D forward modelling and measured test data 
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Kun Zhang , Wenbo Wei , Qingtian Lu , Huafeng Wang and Yawei Zhang
pp. 100-107

A new zero-cost method of correcting static shift in magnetotelluric data is proposed based on 3D forward modelling and field tests. The method has been verified using synthetic and real data.

 
  
 

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Denoising time-domain induced polarisation data using wavelet techniques 
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Ravin N. Deo and James P. Cull
pp. 108-114

We have conducted the first application of wavelet-based denoising techniques for processing raw TDIP data. Our investigation included laboratory and field measurements to better understand the advantages and limitations of these techniques. It was found that distortions arising from conventional filtering can be significantly avoided with wavelet-based methods.

 
  
 

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Microtremor response of the Cheongcheon dam in Korea 
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Ki Young Kim and Young-Gyu Park
pp. 115-122

Microtremors were analysed using the H/H and H/V methods to estimate site effects of the Cheongcheon earthen dam in Korea. The peak near 3 Hz may correspond to depth to the bedrock, whereas the other peaks at higher frequencies may reflect the geometrical effect of the dam or overtone responses.

 
  
 

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High lateral resolution exploration using surface waves from noise records 
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Francisco José Chávez-García and Toshiaki Yokoi
pp. 123-132

We use seismic interferometry to process ambient noise recorded in measurement lines. The Rayleigh wave component of the Green’s Functions is obtained with a high S/N ratio. Using CMPCC analysis, we can identify lateral variations of phase velocity inside the seismic line with higher resolution compared to conventional analysis.

 
  
 

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Time–quefrency analysis of overlapping similar microseismic events 
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Koji Nagano
pp. 133-144

This paper describes a cepstrum analysis using window functions to determine the interval between P-waves in similar, overlapping microseismic events. The window functions isolate the two P-waves and suppress the second S-wave. Applications of the method to both synthetic and field data show that it can identify the P-wave interval.

   |        Open Access Article
 

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A comparison of binary and multiclass support vector machine models for volcanic lithology estimation using geophysical log data from Liaohe Basin, China 
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Dan Mou and Zhu-Wen Wang
pp. 145-149

This paper describes the use of binary and multiclass support vector machine models with geophysical log data to estimate the volcanic lithology of the Liaohe Basin in China. A comparison between predicted data and actual data from four wells indicates that binary and multiclass support vector machine models are effective methods for classifying volcanic lithology.

 
  
 

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The 3D inversion of airborne gamma-ray spectrometric data 
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Brian Minty and Ross Brodie
pp. 150-157

A new method is presented for the inversion of airborne gamma-ray spectrometric line data to a regular grid of radioelement concentration estimates on the ground. The method incorporates the height of the aircraft and the topography. It eliminates terrain effects and improves the interpolation between flight lines.

 
  
 

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Numerical dispersion analysis for three-dimensional Laplace-Fourier-domain scalar wave equation 
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Jing-Bo Chen
pp. 158-167

Based on the phase velocity and attenuation propagation velocity, a method for performing numerical dispersion analysis of three-dimensional Laplace-Fourier-domain scalar wave equation is presented. This method is applied to a 27-point average-derivative optimal scheme and a 27-point finite-element scheme.

 
  
 

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These articles have been peer reviewed and accepted for publication. They are still in production and have not been edited, so may differ from the final published form.

    EG15077  Accepted 13 June 2016
    Relationship between bulk mineralogy and Induced Polarization responses in IOCG and Porphyry Copper mineralization, Northern Chile
    Sebastian Aguilef, Jaime Araya Vargas, Gonzalo Yañez
    Abstract


    EG16063  Accepted 08 June 2016
    Multi-parameter full waveform inversion using Poisson’s ratio for elastic media
    Ju-Won Oh, Dong-Joo Min
    Abstract


    EG15095  Accepted 01 June 2016
    Short-offset grounded-wire TEM for efficient detection of mined-out areas in vegetation-covered mountainous coalfields
    Nan zhou, Guoqiang Xue, Dongyang Hou, Hai Li
    Abstract


    EG15105  Accepted 29 May 2016
    IDENTIFICATION OF MASSIVE SULPHIDE TARGETS USING THE GALVANIC SOURCE EM SIGNAL FROM A SUB-AUDIO MAGNETIC SURVEY AT THE FAR SOUTH PROJECT, WESTERN AUSTRALIA
    Daniel Card, Yvonne Wallace, Bill Peters
    Abstract


    EG16015  Accepted 29 May 2016
    AIRBORNE IP: EXAMPLES FROM MOUNT MILLIGAN DEPOSIT, CANADA AND AMAKINSKAYA KIMBERLITE PIPE, RUSSIA
    Andrea Viezzoli, Vlad Kaminski
    Abstract


    EG15124  Accepted 11 May 2016
    Effects of the Symmetry Axis Orientation of a TI Overburden on Seismic Images
    Chih-Hsiung Chang, Young-Fo Chang, Cheng-Wei Tseng
    Abstract


    EG14050  Accepted 08 June 2014
    Errata for Clark, D.A., 2012. New methods for interpretation of magnetic vector and gradient tensor data I: eigenvector analysis and the normalised source strength. Exploration Geophysics, 43, 267–282, http://dx.doi.org/10.1071/EG12020.
    David Clark
    Abstract


7


The Most Read ranking is based on the number of downloads from the CSIRO PUBLISHING website of articles published in the previous 12 months. Usage statistics are updated daily.

Rank Paper Details
1. Published 1 September 2015
Edge enhancement of potential field data using an enhanced tilt angle

Xu Zhang, Peng Yu, Rui Tang, Yang Xiang and Chong-Jin Zhao

2. Published 1 June 2016
The 3D inversion of airborne gamma-ray spectrometric data

Brian Minty and Ross Brodie

3. Published 1 September 2015
Magnetic depths to basalts: extension of spectral depths method

Roger Clifton

4. Published 1 September 2015
An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data

Esben Auken, Anders Vest Christiansen, Casper Kirkegaard, Gianluca Fiandaca, Cyril Schamper, Ahmad Ali Behroozmand, Andrew Binley, Emil Nielsen, Flemming Effersø, Niels Bøie Christensen, Kurt Sørensen, Nikolaj Foged and Giulio Vignoli

5. Published 1 June 2016
Denoising time-domain induced polarisation data using wavelet techniques

Ravin N. Deo and James P. Cull

6. Published 26 February 2016
Frequency-wavenumber implementation for P- and S-wave separation from multi-component seismic data

Zhiyuan Li, Xiaona Ma, Chao Fu, Bingluo Gu and Guanghe Liang

7. Published 26 February 2016
Benefits of using multi-component transmitter–receiver systems for determining geometrical parameters of a dipole conductor from single-line anomalies

Jacques K. Desmarais and Richard S. Smith

8. Published 1 June 2016
High lateral resolution exploration using surface waves from noise records

Francisco José Chávez-García and Toshiaki Yokoi

9. Published 1 June 2016
The distortion tensor of magnetotellurics: a tutorial on some properties

Frederick E. M. Lilley

10. Published 26 November 2015
Integrated interpretation of overlapping AEM datasets achieved through standardisation

Camilla C. Sørensen, Tim Munday and Graham Heinson

11. Published 26 February 2016
Depth and shape solutions from second moving average residual magnetic anomalies

El-Sayed M. Abdelrahman, Khalid S. Essa, Tarek M. El-Araby and Eid R. Abo-Ezz

12. Published 26 February 2016
3D unconstrained and geologically constrained stochastic inversion of airborne vertical gravity gradient data

Euloge Budet Tchikaya, Michel Chouteau, Pierre Keating and Pejman Shamsipour

13. Published 1 June 2016
Correction of magnetotelluric static shift by analysis of 3D forward modelling and measured test data

Kun Zhang, Wenbo Wei, Qingtian Lu, Huafeng Wang and Yawei Zhang

14. Published 26 February 2016
Monitoring CO2 drainage and imbibition in a heterogeneous sandstone using both seismic velocity and electrical resistivity measurements

Jongwook Kim, Myung Jin Nam and Toshifumi Matsuoka

15. Published 26 February 2016
Drill-rig noise suppression using the Karhunen-Loéve transform for seismic-while-drilling experiment at Brukunga, South Australia

Baichun Sun, Andrej Bóna, Binzhong Zhou, Andrew King, Christian Dupuis and Anton Kepic

16. Published 1 September 2015
Accelerating seismic interpolation with a gradient projection method based on tight frame property of curvelet

Jingjie Cao, Yanfei Wang and Benfeng Wang

17. Published 1 September 2015
mCSEM inversion for CO2 sequestration monitoring at a deep brine aquifer in a shallow sea

Seogi Kang, Kyubo Noh, Soon Jee Seol and Joongmoo Byun

18. Fast inversion of gravity data using the symmetric successive over-relaxation (SSOR) preconditioned conjugate gradient algorithm

Zhaohai Meng, Fengting Li, Xuechun Xu, Danian Huang and Dailei Zhang

19. Published 1 September 2015
Inverse AVO problem for a stack of layers

Liliya Malovichko

20. Published 1 September 2015
First application of airborne gravity to oil exploration in the Shengli oil province, eastern China

Wenyong Li, Jianxin Zhou, Yanxu Liu and Jianchun Xu


      
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