Articles

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April 2018

Introduction to April Focus: Induced Seismicity

Wendell Pardasie

Microseismic monitoring in the oil and gas industry is the process whereby typically low magnitude seismic events (below ~1 moment magnitude) are detected and located in the subsurface during hydraulic fracturing utilizing downhole, surface or shallow subsurface arrays. Many definitions have used wording such as small scale or micro earthquakes…

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April 2018

Injection-Induced Seismicity: End of the Beginning?

Shawn Maxwell

For the last several years there have been numerous technical workshops on injection-induced seismicity which, looking back, serve as snapshots documenting the rapid evolution in our understanding of this important topic. With time, the tone of these workshops has changed in step with advancement by industry, regulators and academics managing…

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April 2018

Ranking Operation Scenarios for Effective Mitigation of Hydraulic Fracture-Induced Seismicity

Shawn Maxwell, Devin Garrett, Paige Mamer and Atena Pirayehgar

A magnitude-based, traffic light protocol is the most common mitigation approach to injection-induced seismicity, adopted by both regulators and operators throughout North America. Despite challenges associated with a protocol based on an estimate of seismic source strength, magnitude-based protocols still prevail over alternatives such as using measured ground motions. Regardless…

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April 2018

Economics of Induced Seismicity: Trying to identify faults in the horizontal well planning stage

Brian Wm Schulte

“Induced seismicity” refers to a seismic event that is caused by pore pressure and stress change associated with human activity (Boroumand and Maghsoudi, 2016). The maximum magnitude of induced earthquakes is smaller than what is seen with natural earthquakes (Metz et al., 2017); they tend to occur in swarms (Metz et…

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April 2018

CSEG Changing of the Guard

John L.J. Duhault

While the CSEG Board of Directors would not consider themselves “sentries” they are however, custodians of the not-for-profit association: Canadian Society of Exploration Geophysicists, your society.

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April 2018

Forecasting Bitumen State

D. Gray, D. Todorovic-Marinic, G. Larson, J. Zhang, D.J. Naidu, M. Letizia, K.A. Wagner, and M. Palka

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April 2018

In Memoriam: Dr. Kenneth Duckworth

Neda Boroumand, David Henley and Amanda Hall

Ken Duckworth, retired Professor of Geophysics at the University of Calgary, died peacefully on the evening of February 18, 2018 at the Foothills Hospital.

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April 2018

In Memoriam: Peter Boyd

Ann Mooney

It is with great sadness that we share with you the passing of Peter Boyd, co-founder of Arcis Corporation.

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March 2018

How Widespread is Human-Induced Seismicity in the United States & Canada?

Mirko van der Baan

There has been significant public and scientific interest in the observation of changed seismicity rates in North America since 2008, possibly due to human activities. We find that the seismicity rate in Oklahoma between 2008 and 2016 is strongly correlated to increased hydrocarbon production.

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March 2018

Introduction to March Focus: Salt and Subsalt Imaging in the Gulf of Mexico

Quincy Zhang

Subsalt imaging is one of the most critical technologies driving exploration to farther and deeper frontier areas in the Gulf of Mexico. For almost every project about subsalt imaging in the Gulf of Mexico, the three most important issues always are...

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March 2018

Salt Modeling Challenges and Strategies in the Mississippi Canyon, Gulf of Mexico

Quincy Zhang, Cristina Reta-Tang and Gary Rodriguez

In the Mississippi Canyon a unique characteristic of salt geometries are their stacking hourglass shapes – autochthonous Louann salt forms the lower part, allochthonous Mesozoic salt forms the middle part, and a Cenozoic salt canopy forms the shallow part. Due to this unique characteristic and the numerous overhangs common in…

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March 2018

Enhancing Salt and Subsalt Imaging in Deep Water, Gulf of Mexico, with Common Offset RTM Gathers

Jianshun Sheng, Seung Yoo, Cristina Reta-Tang and Gary Rodriguez

We focus on extracting new value from previously acquired orthogonal WAZ surveys in the Mississippi Canyon area where some of the largest and still active deep water discoveries reside. Some analyses estimate that many large subsalt/presalt fields can still be discovered. In this study, the subsalt images which are critical…

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March 2018

Post-migration Coherent Noise Removal by Dip Decomposition to Enhance Subsalt Imaging in the Gulf of Mexico

Hongyan Li, Peter Winther, Carlos Espinoza, George Zhao, and Neeraj Duhoon

In the Gulf of Mexico (GoM), with complex salt geometry, it is not unusual to see coherent noise in subsalt imaging. Such noise is detrimental to subsalt exploration and appraisal as it often leads to incorrect interpretations. The coherent noise is related to converted waves, intra-salt multiples, residual free-surface multiples, seismic data acquisition noise, and…

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March 2018

Enhancement of Seismic Monitoring in Hydrocarbon Reservoirs

Enrico Caffagni and Götz Bokelmann

The oil and gas industry is currently undergoing an extended period of instability. Technology can be leveraged to improve these difficult circumstances. The challenge is to develop ground-breaking technologies that help manage new projects more efficiently. At the same time, there is a tremendous need for technology to ensure a…

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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…