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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 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 28 July 2015
The 3D inversion of airborne gamma-ray spectrometric data 
Brian Minty and Ross Brodie

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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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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Published online 25 June 2015
Numerical dispersion analysis for three-dimensional Laplace-Fourier-domain scalar wave equation 
Jing-Bo Chen

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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Published online 12 June 2015
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

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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Published online 15 May 2015
A comparison of binary and multiclass support vector machine models for volcanic lithology estimation using geophysical log data from Liaohe Basin, China 
Dan Mou and Zhu-Wen Wang

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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Published online 15 May 2015
Time–quefrency analysis of overlapping similar microseismic events 
Koji Nagano

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.

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Published online 08 May 2015
Denoising time-domain induced polarisation data using wavelet techniques 
Ravin N. Deo and James P. Cull

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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Published online 01 May 2015
The distortion tensor of magnetotellurics: a tutorial on some properties 
Frederick E. M. Lilley

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.

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Published online 29 April 2015
Microtremor response of the Cheongcheon dam in Korea 
Ki Young Kim and Young-Gyu Park

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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Published online 07 April 2015
High lateral resolution exploration using surface waves from noise records 
Francisco José Chávez-García and Toshiaki Yokoi

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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Published online 25 March 2015
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

We show the advantages of using multi-component transmitter–receiver systems for determining the geometry of a dipole conductor. We find that single transmitter systems are unable to resolve the orientation of an axially symmetric conductor and subsequently determine which measurements from a multi-component transmitter–receiver system are critical to address this problem.

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Published online 25 March 2015
Decomposing the electromagnetic response of magnetic dipoles to determine the geometric parameters of a dipole conductor 
Jacques K. Desmarais and Richard S. Smith

A novel automatic data interpretation algorithm is presented for modelling airborne electromagnetic (AEM) data acquired over resistive environments, using a single-component transmitter, where the position and orientation of a dipole conductor is allowed to vary in three dimensions. This algorithm is tested on both synthetic and field data.

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Published online 13 March 2015
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

This paper presents a modified separation equation of P- and S-waves for multi-component seismic data in the frequency-wavenumber domain. The equation can be applied to the seismic data which are recorded on the laterally heterogeneous free surface.

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Published online 26 February 2015
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

We have developed an efficient method to simultaneously determine the depth and shape of a buried structure from second moving average residual magnetic anomalies. The method is based on computing the standard deviation of the depths for each shape factor, and was applied to synthetic and field data.

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Published online 24 February 2015
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

Seismic velocity and electrical resistivity were measured simultaneously to monitor the behaviour of carbon dioxide (CO2) during CO2 drainage and imbibition within a heterogeneous, clay-containing Tako sandstone sample. Employing Archie’s equation and the Gassmann fluid-substitution equation, electrical resistivities and P-wave velocities were analysed respectively and interpreted to evaluate CO2 saturation.

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Published online 24 February 2015
3D unconstrained and geologically constrained stochastic inversion of airborne vertical gravity gradient data 
Euloge Budet Tchikaya, Michel Chouteau, Pierre Keating and Pejman Shamsipour

This article presents an inversion tool for airborne gravity gradient data that yields a 3D density model using stochastic methods i.e. cokriging and conditional simulation. This method uses geostatistical properties of the measured gravity gradient to estimate a 3D density model. Applications to modelled and survey data demonstrate the performance of the method.

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Published online 19 February 2015
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

To overcome the challenge of surface wave interference generated from drill rigs for seismic-while-drilling, we compare two wavefield separation methods: (1) the Karhunen-Loéve (KL) transform and (2) the fk filter. The results show that drill-rig noise can be effectively suppressed in the correlation domain.

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blank image Exploration Geophysics
Volume 46 Number 4 2015

 
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Table of Contents 
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Integrated interpretation of overlapping AEM datasets achieved through standardisation 
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Camilla C. Sørensen , Tim Munday and Graham Heinson
pp. 309-319

Combining resistivity-depth models obtained from the inversion of airborne electromagnetic data can be challenging, but spatially coherent resistivity-depth images of the ground can assist geological interpretations. We use ground EM data to standardise AEM data so as to be able to combine overlapping AEM datasets acquired with different systems.

 
  
 

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Laboratory modelling of self-potential anomalies due to spherical bodies 
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Mohamad Sadegh Roudsari and Ali Beitollahi
pp. 320-331

This paper presents the experimental design and modelling of self-potential anomalies produced by a sphere-shaped copper–zinc source using a water tank and polarising electrodes. Self-potentials were measured by placing the sphere at a given depth in a rectangular glass tank filled with water.

 
  
 

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Deblending using a space-varying median filter 
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Yangkang Chen
pp. 332-341

In this paper, I propose to use a space-varying median filter (SVMF) to remove blending noise. I demonstrate that this filtering method preserves more useful seismic reflection than does the conventional version of a median filter (MF). SVMF can be regionally adaptive, instead of rigidly using a constant window length through the whole profile for filtering.

 
  
 

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Kirchhoff prestack migration using the suppressed wave equation estimation of traveltime (SWEET) algorithm in VTI media 
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Ho Seuk Bae , Wookeen Chung , Jiho Ha and Changsoo Shin
pp. 342-348

This paper examines anisotropic prestack Kirchhoff migration using the pseudo-acoustic wave equation in a vertical transversely isotropic (VTI) medium. Both amplitudes and traveltimes were calculated efficiently for migration using the suppressed wave equation estimation of traveltime (SWEET) algorithm.

 
  
 

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Imaging tilted transversely isotropic media with a generalised screen propagator 
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Sung-Il Shin , Joongmoo Byun and Soon Jee Seol
pp. 349-358

We expand the vertical transversely isotropic generalised screen propagator into a tilted transversely isotropic generalised screen propagator (TTI-GSP) by adopting tilted coordinates. The validity of the developed algorithm has been tested by increasing the accuracy of wide-angle propagation in TTI-GSP with high-order expansion of the velocity perturbation.

 
  
 

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A modified excitation amplitude imaging condition for prestack reverse time migration 
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Bingluo Gu , Youshan Liu , Xiaona Ma , Zhiyuan Li and Guanghe Liang
pp. 359-370

We propose a process to effectively use the modified shortest path method for extracting the maximum amplitude around the first-arrival events. Then, the excitation amplitude imaging condition is applied to obtain a continuous and clear migration image. Numerical tests show that the improvement is feasible and effective in complex-structure media.

 
  
 

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Direct simulation Monte Carlo method with a focal mechanism algorithm 
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Asep Nur Rachman , Tae Woong Chung , Kazuo Yoshimoto and Sukyoung Yun
pp. 371-380

To simulate the observation of the radiation pattern of an earthquake, the direct simulation Monte Carlo method is modified by implanting a focal mechanism algorithm. The modified method shows more reliable results compared to those of the original one, for events with more than 12 recorded stations.

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Calculation of gravity due to a vertical cylinder using a spherical harmonic series and numerical integration 
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Sung-Ho Na , Hyoungrea Rim , Young-Hong Shin , Mutaek Lim and Yeong-Sue Park
pp. 381-386

In this paper, the spherical harmonic series of the gravitational potential and its gravity field due to a right vertical cylinder was developed. This series can be used at far and intermediate regions, and it is fast and accurate, using only a few terms.

 
  
 

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Identification of leachate from livestock mortality burial using electrical resistivity and small-loop EM survey: case history 
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Sung-Ho Song , In-Ky Cho and Kwang-Jun Choi
pp. 387-393

A small-loop EM survey and electrical resistivity survey were applied to a carcass disposal site to delineate the burial shape and extent of leachate arising from the burial. The small-loop EM survey was adequate for a reconnaissance survey of the burial zone and the resistivity survey was useful for quantitatively interpreting the pathway of leachate flows in the site.

 
  
 

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Case studies of geophysical imaging for road foundation design on soft soils and embankment risk assessment 
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Robert J. Whiteley , Richard B. Kelly and Simon B. Stewart
pp. 394-402

The application of both geophysical imaging and geotechnical testing in road foundation design is a cost-effective enhancement for site characterisation of soft soils and for risk assessment of potentially unstable embankments. The incorporation of geophysics allows concentration on fewer but higher quality soil probings and geotechnical boreholes.

 
  
 

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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.

    EG15041  Accepted 13 January 2016
    Fast inversion of gravity data using the symmetric successive over-relaxation (SSOR) preconditioned CG Algorithm
    Zhaohai Meng, Fengting Li, Xuechun Xu, Danian Huang, Dalei Zhang
    Abstract


    EG15127  Accepted 24 December 2015
    Gas hydrate saturation and distribution in the Kumano Forearc Basin of the Nankai Trough
    Jihui Jia, Takeshi Tsuji, Toshifumi Matsuoka
    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


3


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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 September 2015
Magnetic depths to basalts: extension of spectral depths method

Roger Clifton

3. Published 25 February 2015
Rapid approximate inversion of airborne TEM

Peter K. Fullagar, Glenn A. Pears, James E. Reid and Ralf Schaa

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 25 February 2015
3D-spectral CDIs: a fast alternative to 3D inversion?

James Macnae

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

Camilla C. Sørensen, Tim Munday and Graham Heinson

7. Published 25 February 2015
Airborne electromagnetic modelling options and their consequences in target definition

Alan Yusen Ley-Cooper, Andrea Viezzoli, Julien Guillemoteau, Giulio Vignoli, James Macnae, Leif Cox and Tim Munday

8. Published 25 February 2015
MULTIPULSE – high resolution and high power in one TDEM system

Tianyou Chen, Greg Hodges and Philip Miles

9. 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

10. Published 26 May 2015
Memoryless quasi-Newton (MLQN) method for 2D acoustic full waveform inversion

Cai Liu, Fengxia Gao, Xuan Feng, Yang Liu and Qianci Ren

11. High lateral resolution exploration using surface waves from noise records

Francisco José Chávez-García and Toshiaki Yokoi

12. Published 25 February 2015
Helicopter EM (ZTEM–VTEM) survey results over the Nuqrah copper–lead–zinc–gold SEDEX massive sulphide deposit in the Western Arabian Shield, Kingdom of Saudi Arabia

Jean M. Legault, Carlos Izarra, Alexander Prikhodko, Shengkai Zhao and Emad M. Saadawi

13. Published 25 February 2015
New developments in AEM discrete conductor modelling and inversion

Marc A. Vallée

14. 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

15. 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

16. 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

17. Published 26 November 2015
Calculation of gravity due to a vertical cylinder using a spherical harmonic series and numerical integration

Sung-Ho Na, Hyoungrea Rim, Young-Hong Shin, Mutaek Lim and Yeong-Sue Park

18. Published 25 February 2015
Developing an efficient modelling and data presentation strategy for ATDEM system comparison and survey design

Magdel Combrinck

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

Liliya Malovichko

20. Published 26 November 2015
A modified excitation amplitude imaging condition for prestack reverse time migration

Bingluo Gu, Youshan Liu, Xiaona Ma, Zhiyuan Li and Guanghe Liang


      
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