Articles

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January 2018

A Glimpse into the World of Seismic Attributes

Rainer Tonn

The Flemish Pass, offshore east coast Canada, has been an area of increased exploration activity since the discovery of Bay du Nord in 2013. The Flemish Pass is one of the core exploration areas within Statoil’s international portfolio. Additional recent discoveries have demonstrated further exploration success, while the award of…

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January 2018

Why We Should Perform PSDM and Calculate Seismic Attributes in the Depth Domain, Examples from the Woodford Formation

Marianne Rauch-Davies

We are commonly challenged to generate a drill plan in depth from time migrated seismic. In order to meet the needs of interpreters and drillers, PSTM volumes are frequently converted to pseudo depth volumes by stretching. This process affects every part of the drill planning procedure as these pseudo-depth data…

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January 2018

Introduction to January Focus: Emerging Technologies: Machine Learning

Hoda Rashedi

Surprisingly, the first time I was exposed to the basic concept of Machine Learning was at one of my undergraduate course called, “Philosophy of mind”. That was the first time, I was learning about how our brain functioning and how it could be biased. The year after, I took General…

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January 2018

A Gentle Introduction to Machine Learning

Mark Dahl

Machine learning has generated a lot of excitement in recent years. It is only a matter of time before machine learning becomes commonplace in geoscience. There are many reasons for this that I could argue, but two come immediately to mind: machine learning has enjoyed incredible success in similar data-rich…

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January 2018

Machine Learning in Geoscience V: Introduction to Classification with SVMs

Matteo Niccoli

In this machine learning tutorial, I intend to provide readers with an intuitive understanding of how Support Vector Machines (SVMs) work and how they are used to solve classification problems. I will utilize Scikit-learn [2], a Python library, and a few toy datasets inspired by classic examples with an added…

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January 2018

Geochemical Facies Analysis Using Unsupervised Machine Learning

Brendon Hall

This tutorial will demonstrate step-by-step how to build a practical geoscience machine learning workflow using Python and scikit-learn. The practice of extracting insights from large datasets has certainly caught mainstream attention in recent years. Software packages are emerging with multivariate statistics and machine learning algorithms built in to workflows. As…

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January 2018

Denoising Seismic Records with Image Translation Networks

Graham Ganssle

Denoising data is the essence of discovery. Raw seismic data are a jumbled collection of bits bearing little resemblance to geology. All of the steps in the seismic data processing workflow, including deconvolution, migration, and stacking are noise reduction techniques designed by geophysicists to highlight a certain type of signal…

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January 2018

Properties of Propagating Wavelets with Severe Short-Period Internal Multiples

Fred Hilterman and Leila NAILI DOUAOUDA

Seismic waves propagating through cyclical thin beds, which have a large acoustic impedance (AI) contrast to the surrounding sedimentary sequence, have distinct wavelet signatures. At depth, the wavelets have a low-frequency Gaussian-shaped signal followed by high-frequency noise coda. These complex wavelets often yield seismic with discontinuous primary reflections that have…

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December 2017

Forecasting bitumen state and production from 3C-4D seismic

David Gray and Dragana Todorovic-Marinic

Assessing the liquid state of bitumen and its production is now possible from 4D seismic. From conventional 4D seismic data, steam chamber volume can be determined. From 3C-4D (3-component, 4-dimensional) PS (P-wave down, converted S-wave up) seismic data, the liquid state of the bitumen, immediately produceable bitumen, and future produceable…

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December 2017

Introduction to December Focus: Developments in Groundwater Geophysics

Melvyn Best

Issues related to groundwater continue to grow in importance throughout the world, and geoscience techniques to deal with these issues are developing rapidly. Methods are needed to map the extent and quality of groundwater resources, water depletion and pollution, and subsurface flow related to engineering projects such as dams. Increasingly,…

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December 2017

Interpreted Water Quality Calculated from Borehole Resistivity Measurements in the Gulf Coast Aquifer, Lower Rio Grande Valley, Texas, U.S.A.

John Meyer and Andrea Croskrey

Texas has significant brackish groundwater resources estimated at over 2.7 billion acre-feet within 26 of the 30 designated major and minor aquifers. Brackish groundwater ranges from 1,000 to 10,000 milligrams per liter total dissolved solids (TDS) concentration, which includes the slightly saline and moderately saline zones. The Texas Water Development…

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December 2017

The Application of Airborne Geophysics for Water Exploration

Bill Brown and Flemming Effersø

Airborne electromagnetic methods (AEM) have been widely used for more than 60 years by the oil and mineral industries as a primary exploration method. In the last 30 years, water resource management challenges have prompted the application of AEM methods to basin- or watershed-scale mapping (e.g. Abraham et al., 2012;…

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December 2017

Hydrogeophysical Investigations of Earthen Dams – Two California Case Studies

Bethany L. Burton, Paul A. Bedrosian, Burke J. Minsley, Scott Ikard, Michael H. Powers

Excessive groundwater seepage can be a common engineering concern with earthen dams. The application of geophysical methods, whether for characterization or for long-term monitoring, to help inform mitigation strategies is becoming a more common addition to these investigations. The U.S. Geological Survey (USGS) has completed geophysical investigations at several earthen…

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December 2017

Integrating Airborne Electromagnetic and Gamma Log Data for Regional Aquifer Mapping: Montney Play Area, NE British Columbia

Melvyn Best, Vic Levson, Carlos Salas

The Peace region of NE British Columbia is an important agricultural area. It also contains significant gas reserves in the Montney natural gas play area. Agriculture and gas production require considerable volumes of water. There are also communities and First Nations within the region that require potable water for domestic…

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December 2017

CSEG 2018/2019 Executive Election

CSEG Executive Committee

Summary of candidates for the 2018/2019 CSEG Executive election.

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December 2017

In Memoriam of Barry Korchinski

Neil Rutherford and Barry Johnson

Barry’s honest and pleasant manner earned him professional respect and many friends over the years. The Calgary geophysical industry and his friends will truly miss the quiet, always smiling, always supportive man, who created many years of fond memories for those who knew him.

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October 2017

The Final Shakeout Phase of the 2014 Energy Bear Market is Now Underway – What Happens from There?

Josef Schachter

Many factors have an impact on the energy market and the market for hydrocarbons in particular. As well as addressing the current factors at the time of the DoodleTrain Luncheon the following items will be addressed and analyzed.

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October 2017

Introduction to October Focus: Intro to Seismic Processing

Rob Holt

This month we feature four articles on different aspects of seismic processing. As a whole they capture many of the recent advances in the field of seismic processing, which slowly but surely evolves as time goes by.

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October 2017

6D Interpolation of Seismic Data – Rationale, Practice and FAQs

Mark Ng and Dan Negut

For many reasons, such as acquisition limitations, economic constraints, and merging data of various shooting parameters from different vintages, seismic data needs to be regularized, upsampled, reconstructed and interpolated. Furthermore, a common deliverable of interpolation is regularized prestack data which will improve many state-ofthe- art inversion processes and migration imaging.

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October 2017

A Well-Guided Processing Approach

Regan Kennedy, Josh Curtis, Greg Staples and Kristof De Meersman

In any processing flow countless parameter choices are made, including which processes to apply, what order to apply them in, and how to parametrize them. In seismic processing, many different but sound choices can all produce similar images. These similar images may not be geologically equivalent when examining all products…