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Exploration Geophysics
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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 21 July 2014
Geobandwidth: comparing time domain electromagnetic waveforms with a wire loop model 
Greg Hodges and Tianyou Chen

The effect of time domain EM waveform, power and receiver sampling times are effectively compared for a wide range of time constants using a wire loop conductor model. Peak time constant and equivalent frequency can be determined analytically or numerically. Arbitrary waveforms can be modelled as a sum of simple short ramps.

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Published online 17 July 2014
First application of airborne gravity to oil exploration in the Shengli oil province, eastern China 
Wenyong Li, Jianxin Zhou, Yanxu Liu and Jianchun Xu

An airborne gravity survey was successfully conducted over the onshore and offshore regions of the south-west Bohai Sea. The derived Bouguer gravity data and inversed results correlate well with features such as known faults, swells, sags, and oilfields identified by earlier seismic survey and drilling data.

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Published online 16 July 2014
Methods for determining remanent and total magnetisations of magnetic sources – a review 
David A. Clark

Assuming without evidence that magnetic sources are magnetised parallel to the geomagnetic field can seriously mislead interpretation and can result in drillholes missing their targets. This paper reviews methods that are available for estimating the natural remanent magnetisation and total magnetisation of magnetic sources, noting the strengths and weaknesses of each approach.

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Published online 14 July 2014
Efficient forward modelling using the self-consistent impedance method for electromagnetic surface impedance 
Hugo G. Espinosa and David V. Thiel

The two-dimensional self-consistent impedance method was used to calculate the electromagnetic surface impedance above subsurface structures at very low frequencies. The technique has been applied to the analysis of a coal seam with various structural anomalies and line of oxidation. This improved technique allows in-field inverse modelling of surface impedance data.

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Published online 26 June 2014
Edge enhancement of potential field data using an enhanced tilt angle 
Xu Zhang, Peng Yu, Rui Tang, Yang Xiang and Chong-Jin Zhao

An edge-detection technique for the enhancement of potential field data, which is based on the tilt angle of the first order vertical derivative of the total horizontal gradient, is presented. The new filter clearly enhances the edges of superimposed sources sharply and generates more subtle detail.

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Published online 03 June 2014
Comments on: Christensen, N., and Lawrie, K., 2012. Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system, Exploration Geophysics, 43, 213–227 
Adam Smiarowski and Shane Mulè

The AEM in-line component is added to the posterior model covariance matrix analysis done by Christensen and Lawrie, who estimated resolution of data in an inversion program. They compared two AEM systems: SkyTEM and CGG’s TEMPEST™. Here, we clarify points made about TEMPEST™ and extend the analysis to include the in-line component.

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Published online 03 June 2014
Response to comments by Adam Smiarowski and Shane Mulè on: Christensen, N., and Lawrie, K., 2012. Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system, Exploration Geophysics, 43, 213–227 
Niels B. Christensen and Ken Lawrie

We analyse and compare the resolution improvement that can be obtained from including x-component data in the inversion of AEM data from the SkyTEM and TEMPEST systems. Except for the resistivity of the bottom layer, the SkyTEM system, even without including x-component data, has the better resolution of the parameters of the analysed models.

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Published online 20 May 2014
Practical considerations: making measurements of susceptibility, remanence and Q in the field 
Phillip W. Schmidt and Mark A. Lackie

The measurement of magnetic susceptibility, magnetic remanence and Königsberger ratios can be made in the field, either using a total field magnetometer or a new portable fluxgate device that is described. Various problems of using a magnetic susceptibility meter on non-ideal rock, core and chip samples can be avoided.

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Published online 15 May 2014
Airborne electromagnetic detection of shallow seafloor topographic features, including resolution of multiple sub-parallel seafloor ridges 
Julian Vrbancich and Graham Boyd

An airborne EM survey over shallow waters in Backstairs Passage, South Australia, detected a mini-seamount and a series of sub-parallel seafloor ridges that vary in peak height and inter-peak spacing. The interpreted resolution of these ridges based on 1D and 3D inversion is consistent with the expected EM footprint.

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Published online 14 May 2014
Radiowave imaging research (RIM) for determining the electrical conductivity of the rock in borehole section OL-KR4-OL-KR10 at Olkiluoto, Finland 
Arto Korpisalo and Eero Heikkinen

The radiowave imaging method (RIM) was tested in the possible area for a repository of spent nuclear fuel in Finland to reveal the properties of granitic bedrock. The detected low and high resistivity zones and their apparent shapes and orientations are in fair agreement with geological and other geophysical results.

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Published online 13 May 2014
Changes in P-wave velocity with different full waveform sonic transmitter centre frequency 
Majed Almalki, Brett Harris and J. Christian Dupuis

We have studied the concept of apparent P-wave dispersion and its implications in shallow, moderately consolidated to unconsolidated sandstones. Although quantitative results of apparent P-wave dispersion were difficult to obtain from the field data, it is reasonably clear that small-scale structures are significant factors in determining variations in velocity dispersion.

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Published online 30 April 2014
Implementation of adaptive edge-preserving smoothing regularisation technique for simultaneous multi-frequency full waveform inversion 
Yunhui Park and Sukjoon Pyun

An adaptive smoothing regularisation method for full waveform inversion is proposed. The proposed regularisation method is designed using the local slope and implemented in the form of a preconditioning filter for pure-gradient-based full waveform inversion. It can yield more reliable and precise inverted results compared with conventional regularisation.

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Published online 22 April 2014
Memoryless quasi-Newton (MLQN) method for 2D acoustic full waveform inversion 
Cai Liu, Fengxia Gao, Xuan Feng, Yang Liu and Qianci Ren

In this paper, a memoryless quasi-Newton (MLQN) method is applied in full waveform inversion to invert velocity from surface seismic data for the first time. This method can attain acceptable results with low computation cost and small memory storage requirements. Synthetic model tests show that the MLQN method is feasible and reliable.

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Published online 16 April 2014
Comparison of numerical dispersion in acoustic finite-difference algorithms 
Wen-Quan Liang, Yan-Fei Wang and Chang-Chun Yang

Different methods were developed to suppress the grid dispersion in numerical simulation of the acoustic wave equation. This paper compares the performance of these methods in the space and time–space domains. Dispersion analysis and numerical simulation indicate that a linear method without iteration performs comparably to the optimised methods.

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Published online 09 April 2014
Iterative reweighted least M-estimate AVO inversion 
Yang Liu, Jiashu Zhang and Guangmin Hu

In this paper, an IRLM algorithm which uses Hampel’s three-part redescending M-estimate function as the misfit measure is proposed for robust AVO inversion. By combining the advantages of the Huber norm and biweight norm, the proposed IRLM algorithm performs better in the complex noise environment.

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Published online 24 March 2014
Evaluation of structural and geological factors in orogenic gold type mineralisation in the Kervian area, north-west Iran, using airborne geophysical data 
Alireza Almasi, Alireza Jafarirad, Hasan Kheyrollahi, Mana Rahimi and Peyman Afzal

This paper introduces exploration clues for orogenic gold prospecting in the north-west of the Sanandaj-Sirjan metamorphic zone, north-west Iran. These are derived based on processing and interpreting airborne magnetic and radiometric data in order to identify favourable host rocks, and surface and subsurface structures.

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Published online 18 March 2014
Gaussian beam prestack depth migration in heterogeneous transversely isotropic media 
Jianguang Han and Yun Wang

Based on anisotropic kinematic and dynamic ray tracing systems, an anisotropic Gaussian beam prestack depth migration method for P-wave data in transversely isotropic media is presented in this paper. Tests of synthetic and field seismic data demonstrate that the method is accurate and efficient.

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Published online 17 March 2014
Mapping pollution and coastal hydrogeology with helicopterborne transient electromagnetic measurements 
Niels B. Christensen and Max Halkjær

We present a helicopterborne transient electromagnetic survey from a region at the North Sea coast in western Jutland, Denmark, carried out at a seriously polluted site with the dual purpose of assessing the extent of the pollution and mapping the coastal hydrogeology to provide data for remediation activities.

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Published online 12 March 2014
Prediction and removal of rotation noise in airborne EM systems 
Terence Kratzer and James Macnae

Limitations to conductive target detection in AEM systems come from the high noise encountered at low base frequencies, caused by rotations of vector magnetic field sensors in the Earth’s magnetic field. We use rotation-rate sensors to predict and subtract the rotation noise from rigidly coupled ARMIT magnetic field sensors.

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Published online 07 March 2014
Identifying damaged areas inside a masonry monument using a combined interpretation of resistivity and ground-penetrating radar data 
Kyosuke Onishi, Tomochika Tokunaga, Yoshihiro Sugimoto, Naoyuki Yamada, Mohamed Metwaly, Katsuro Mogi, Ichita Shimoda and Yoshinori Iwasaki

This study shows results of ground-penetrating radar and electrical exploration surveys, and an interpreted section of the internal structure and moisture distribution in the Bayon Complex in the Angkor heritage site, Cambodia. Rainwater penetrates into the monument through gaps between stone blocks and drains from vertical walls through cavities in the top part.

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Published online 03 March 2014
Seismic-while-drilling data processing with seismic interferometry in the Daqing Oilfield experiment 
Hongtao Liu, Weichuan Huang and Yuquan Li

This paper discusses the methods and applications of seismic interferometry in seismic-while-drilling (SWD) experiments. The results show that the deconvolution method can suppress the source effects and enhance the resolution of the results.

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Published online 27 February 2014
A description of seismic amplitude techniques 
James Shadlow

Analysing seismic data for direct hydrocarbon indicators (DHIs) and amplitude variation with offset (AVO) can be instrumental in identifying the presence of hydrocarbons. Inversion converts seismic data into acoustic impedance, which can be used to estimate geological properties. This paper reviews the literature and commonly used techniques for seismic amplitude analysis.

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Published online 24 February 2014
Least squares staggered-grid finite-difference for elastic wave modelling 
Lei Yang, Hongyong Yan and Hong Liu

In this paper, we derive the staggered-grid finite-difference coefficients of arbitrary even-order accuracy for the first-order spatial derivatives by the dispersion relation and the least squares method, which can satisfy the specific numerical solution accuracy of the derivative on a wide frequency zone for elastic wave numerical modelling.

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Published online 20 February 2014
Optimised edge detection filters in the interpretation of potential field data 
Lili Li, Danian Huang, Liguo Han and Guoqing Ma

A new format of edge detection filter, called the optimised edge detection filter, is presented, which produces maximum values only when the horizontal derivative is a maximum and the vertical derivative is zero. These new filters will not produce spurious edges like those in other methods.

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Published online 01 October 2013
Fault and dyke detectability in high resolution seismic surveys for coal: a view from numerical modelling 
Binzhong Zhou and Peter Hatherly

We use numerical modelling in an ideal noise-free environment and homogeneous layering to investigate the detectability of small faults by seismic reflection surveying. It is shown that the detection of faults relates not only to the seismic wave frequencies and wavelengths, but also to the presence of background structures.

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Published online 24 September 2013
Prestack time imaging algorithm with simultaneous velocity estimation in hard rock environments 
Konstantin Tertyshnikov, Andrej Bóna and Roman Pevzner

This paper describes prestack time migration with simultaneous velocity estimation. The approach is based on an estimation of horizontal slownesses and a subsequent calculation of the migration attributes to obtain a migrated image. The potential application of the method to hard rock seismic exploration is demonstrated on synthetic models.

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Published online 07 June 2013
Pre-stack depth migration for improved imaging under seafloor canyons: 2D case study of Browse Basin, Australia 
Helen Debenham and Shane Westlake

Complex seafloor topography causes problems with seismic imaging related to complex ray paths and sharp lateral changes in velocity. This paper describes the reasons for some of these problems and a selection of imaging techniques, with their pros and cons, in the presence of seafloor canyons.

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blank image Exploration Geophysics
Volume 45 Number 2 2014

 
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Table of Contents 
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A combinatorial filtering method for magnetotelluric time-series based on Hilbert–Huang transform 
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Jianhua Cai
pp. 63-73

Magnetotelluric (MT) time-series are often contaminated with noise from natural or man-made processes. A combinatorial method is described for filtering of MT time-series based on the Hilbert–Huang transform that requires a minimum of human intervention and leaves good data sections unchanged.

 
  
 

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Site characterisation in north-western Turkey based on SPAC and HVSR analysis of microtremor noise 
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Michael W. Asten , Aysegul Askan , E. Ezgi Ekincioglu , F. Nurten Sisman and Beliz Ugurhan
pp. 74-85

Microtremor (passive seismic) array data were used to study sediment thickness in two pull-apart basins located at Düzce and Bolu on the North Anatolian Fault (Turkey). SPAC processing of array data allows estimation of shear-wave velocity in upper layers about 5 m thick (Vs < 200 m/s), and to depths of about 100 m. Inclusion of HVSR data extends the useful frequency range by an order of magnitude and allows resolution of two interfaces of moderate Vs contrast in soft Miocene and Eocene sediments.

 
  
 

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Discovery of a surface wave velocity anomaly in the West Sea of South Korea 
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Kwang Hyun Cho
pp. 86-93

Our study shows that a fracture zone concerning the Permo-Triassic collision exists below the north-eastern sea of the HUK station in South Korea. Recent studies regarding ambient noise tomography in hydro-carbon fields show that the anomaly might have resulted from the hydro-carbon reservoir. In the near future, the ambient noise tomography (ANT) method can replace seismic survey dominantly using body waves to find oil and gas reservoirs.

 
  
 

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Perfectly matched layer on curvilinear grid for the second-order seismic acoustic wave equation 
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Sanyi Yuan , Shangxu Wang , Wenju Sun , Lina Miao and Zhenhua Li
pp. 94-104

Theoretical expressions and analysis of curvilinear-grid PML are presented. PML model 1 with symmetric form and PML model 2 with asymmetric form are derived from the same acoustic wave equation. The examples given show that the symmetric-form PML yields better modelling results than the asymmetric-form PML.

 
  
 

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Converted-wave imaging technology and application for complex structures 
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Pu Wang , Junfeng Liu , Ying Chen and Tianyue Hu
pp. 105-115

Most existing multi-component surveys are deployed in areas with geologically simple structures due to processing challenges. This paper presents a case study of a 3D3C seismic survey with complex structures and faults. We hope that this workflow will provide a technical guide or reference for multi-component exploration with complex structures.

 
  
 

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Numerical simulation using a Hamiltonian particle method for effective elastic properties in cracked media 
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Junichi Takekawa , Hitoshi Mikada and Tada-nori Goto
pp. 116-124

We apply a Hamiltonian particle method (HPM) to simulate seismic wave propagation in a cracked medium. The calculated effective elastic moduli of the cracked medium using the HPM showed good agreement with the modified self-consistent theory.

 
  
 

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The use of GPR attributes to map a weak zone in a river dike 
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Henryk Marcak and Tomislaw Golebiowski
pp. 125-133

In degraded dikes, the crack permeability is increased and damp patches can build up. GPR signal attributes and spectra of GPR traces allow us to locate the more permeable sections of the dike. This has been proven in the interpretation of GPR measurements after the May 2010 flood in Cracow.

 
  
 

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Application of high resolution airborne geophysical data in geological modelling of Mohar Cauldron Complex, Bundelkhand Massif, central India: implications for uranium exploration 
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A. Markandeyulu , A. K. Chaturvedi , B. V. S. N. Raju , P. S. Parihar , Roger Miller and Glenn Gooch
pp. 134-146

High resolution airborne geophysical data were acquired by Fugro Airborne’s GEOTEM system over the Mohar Cauldron Complex (MCC). Advanced processing and interpretation mapped the major geological domains and indicated the presence of three felsic intrusive bodies. The boundary of the sediments within the MCC and subsurface distribution of conductivities are accurately mapped.

 
  
 

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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.

    EG14069  Accepted 18 July 2014
    ESTIMATION OF SURFACE-WAVE PHASE VELOCITY FROM MICROTREMOR OBSERVATION USING AN ARRAY WITH A REFERENCE STATION
    Hiroaki Yamanaka, Kei Kato, Kosuke Chimoto, Seiji Tsuno
    Abstract


    EG14045  Accepted 08 July 2014
    Airborne electromagnetic modelling options and its consequences in target definition
    Alan Ley-Cooper, Andrea Viezzoli, James Macnae, Julien Guillemoteau, Leif Cox, Giulio Vignoli, Tim Munday
    Abstract


    EG14036  Accepted 08 July 2014
    3D-spectral CDIs... a fast alternative to 3D inversion?
    James Macnae
    Abstract


    EG13020  Accepted 02 July 2014
    INVERSE AVO PROBLEM FOR A STACK OF LAYERS
    Liliya Malovichko
    Abstract


    EG14024  Accepted 30 June 2014
    Using the In-line component for Fixed-Wing EM 1D Inversion
    Adam Smiarowski
    Abstract


    EG13050  Accepted 25 June 2014
    Bathymetry, Electromagnetic Streamlines and the Marine Controlled Source Electromagnetic Method
    Andrew Pethick, Brett Harris
    Abstract


    EG14016  Accepted 24 June 2014
    Accelerating Seismic Interpolation with A Gradient Projection Method based on Tight Frame Property of Curvelet
    Jingjie Cao, Yanfei Wang, Benfeng Wang
    Abstract


    EG14022  Accepted 19 June 2014
    Regional TEMPEST survey in North-East Namibia
    Geoff Peters, Gregory Street, Ivor Kahimise, Dave Hutchins
    Abstract


    EG14006  Accepted 19 June 2014
    THE ANALYSIS OF ZTEM DATA ACROSS THE HUMBLE MAGNETIC ANOMALY, ALASKA
    Daniel Sattel, Ken Witherly
    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


    EG14005  Accepted 26 May 2014
    Modelling the SPM response of AEM data
    Daniel Sattel, Paul Mutton
    Abstract


    EG13097  Accepted 26 May 2014
    An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data
    Esben Auken, Anders Christiansen, Casper Kirkegaard, Gianluca Fiandaca, Cyril Schamper, Ahmad Behroozmand, Andrew Binley, Emil Nielsen, Flemming Effersø, Niels Christensen, Kurt Sørensen, Nikolaj Foged, Giulio Vignoli
    Abstract




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 14 March 2014
Grounded electrical-source airborne transient electromagnetics (GREATEM) survey of Aso Volcano, Japan

Hisatoshi Ito, Hideshi Kaieda, Toru Mogi, Akira Jomori and Youichi Yuuki

2. Published 29 November 2013
The ratio of B-field and dB/dt time constants from time-domain electromagnetic data: a new tool for estimating size and conductivity of mineral deposits

Kun Guo, James E. Mungall and Richard S. Smith

3. Published 14 March 2014
Three-dimensional resistivity modelling of grounded electrical-source airborne transient electromagnetic (GREATEM) survey data from the Nojima Fault, Awaji Island, south-east Japan

Sabry Abd Allah, Toru Mogi, Hisatoshi Ito, Akira Jymori, Youichi Yuuki, Elena Fomenko, Kenzo Kiho, Hideshi Kaieda, Koichi Suzuki and Kazuhiro Tsukuda

4. Published 3 September 2013
Three-dimensional magnetotelluric inversion using a heterogeneous smoothness-constrained least-squares method

Tateyuki Negi, Hideki Mizunaga, Koichi Asamori and Koji Umeda

5. Published 3 September 2013
Radiogenic heat generation in the Darling Range, Western Australia

Mike F. Middleton

6. Published 3 September 2013
A 21-point finite difference scheme for 2D frequency-domain elastic wave modelling

Bingluo Gu, Guanghe Liang and Zhiyuan Li

7. Published 29 November 2013
CET exSim: mineral exploration experience via simulation

Jason C. Wong, Eun-Jung Holden, Peter Kovesi, T. Campbell McCuaig and Jon Hronsky

8. Published 29 November 2013
A wavelet-based baseline drift correction method for grounded electrical source airborne transient electromagnetic signals

Yuan Wang, Yanju Ji, Suyi Li, Jun Lin, Fengdao Zhou and Guihong Yang

9. Optimised edge detection filters in the interpretation of potential field data

Lili Li, Danian Huang, Liguo Han and Guoqing Ma

10. Published 30 May 2014
Application of high resolution airborne geophysical data in geological modelling of Mohar Cauldron Complex, Bundelkhand Massif, central India: implications for uranium exploration

A. Markandeyulu, A. K. Chaturvedi, B. V. S. N. Raju, P. S. Parihar, Roger Miller and Glenn Gooch

11. Published 30 May 2014
A combinatorial filtering method for magnetotelluric time-series based on Hilbert–Huang transform

Jianhua Cai

12. Published 29 November 2013
Alternative local wavenumber methods to estimate magnetic source parameters

Guoqing Ma and Lili Li

13. Published 3 September 2013
Geophysical techniques for low enthalpy geothermal exploration in New Zealand

Supri Soengkono, Chris Bromley, Robert Reeves, Stewart Bennie and Duncan Graham

14. Published 14 March 2014
Aeromagnetic 3D subsurface imaging with effective source volume minimisation and its application to data from the Otoge cauldron, Shitara, Central Japan

Tadashi Nakatsuka and Shigeo Okuma

15. Published 14 March 2014
Radiation monitoring using an unmanned helicopter in the evacuation zone around the Fukushima Daiichi nuclear power plant

Yukihisa Sanada, Atsuya Kondo, Takeshi Sugita, Yukiyasu Nishizawa, Youichi Yuuki, Kazutaka Ikeda, Yasunori Shoji and Tatsuo Torii

16. Published 29 November 2013
Structural interpretation of the Ifal Basin in north-western Saudi Arabia from aeromagnetic data: hydrogeological and environmental implications

Eslam Elawadi, Haider Zaman, Awni Batayneh, Saad Mogren, Abdalaziz Laboun, Habes Ghrefat and Taisser Zumlot

17. Published 14 March 2014
Aeromagnetic survey using an unmanned autonomous helicopter over Tarumae Volcano, northern Japan

Takeshi Hashimoto, Takao Koyama, Takayuki Kaneko, Takao Ohminato, Takatoshi Yanagisawa, Mitsuhiro Yoshimoto and Eiichi Suzuki

18. Published 14 March 2014
Precipitation correction of airborne gamma-ray spectrometry data using monitoring profiles: methodology and case study

Andreas Ahl, Klaus Motschka and Peter Slapansky

19. Published 29 November 2013
Robust incident-angle field estimation: a one-way wave propagator approach

Jiangjie Zhang and Hui Zhang

20. Published 30 May 2014
Numerical simulation using a Hamiltonian particle method for effective elastic properties in cracked media

Junichi Takekawa, Hitoshi Mikada and Tada-nori Goto


      
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