Articles

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March 2017

Introduction To March Focus: Back to Basics

Nicole Willson

The idea for this FOCUS came from a member who replied to one of the CSEG’s member surveys concerning the RECORDER. So, thanks to that member who let us know, and who gave us the great title “Back to Basics.” Many other members also asked for technical content that was…

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March 2017

Datums, Projections and Coordinate Systems

Adam Thomas

Accurately describing locations on Earth is essential to exploration geophysics. The interpretation of fault zones, the surface and bottom locations of a well, and the position and orientation of seismic ground control points and receivers are all dependent on being able to accurately describe where they are. Unfortunately the latitude…

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March 2017

Discovering A Supermodel – A Rock-Physics Tutorial

Carl Reine

Quantitative interpretation (QI) involves making predictions of rock and fluid properties from seismic amplitudes. Within the QI workflow, a number of components can greatly benefit from rock physics, which itself is an incredibly diverse field. Rock physics covers the measurement of rock properties in the lab, the empirical and theoretical…

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March 2017

Knowledge True and False: Scientific Logic and Climate Change

Henry Lyatsky

This scientific “truth” was drilled into me, a young geology undergrad in Calgary, by esteemed professors in basic courses at the beginning of the 1980s. In the 1970s the media were abuzz with global-cooling scares. Cooling was supposedly a scientific fact. Thankfully, the old fears of an impending new ice…

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January 2017

Marcellus/Utica Shale PSDM Case Study – Improved Structural Imaging and Rock Properties

Morgan Brown

In this presentation, we highlight the performance of PreStack Depth Migration (PSDM) on an ION GeoVentures multiclient survey from northwest Pennsylvania, the GroundhogSCAN 3D.

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January 2017

Two Workflows for Image-Based Near-Surface Modeling for Statics Corrections and for Circumventing Velocity Uncertainty in Subsurface Imaging of Complex Structures

Öz Yilmaz

In exploration seismology, the most common type of the near-surface is defined as the depth interval below the topography, composed of a low-velocity, unconsolidated, heterogeneous soil column and weathered rock layer. As such, raypaths are close to vertical incidence within the near-surface – a requirement for statics corrections to be…

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January 2017

Introduction To January Focus: Geostatistics. Big Data. Analytics.

Neda Boroumand

The branch of statistics, “Geostatistics”, the term “Big Data” and the scientific process of “Analytics” have been around for a while. However, their application on data acquired for subsurface evaluation and resource development is becoming increasingly important. The present day Geophysicist/ Geoscientist is having to make sense of more and…

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January 2017

Incorporating Big Data in Geostatistical Modeling for Making Bigger Decisions in the Face of Even Bigger Uncertainty

Jeff B. Boisvert and Clayton V. Deutsch

The main purpose of generating geostatistical models of reservoir properties is to use them to calculate quantities of hydrocarbons or make decisions on how/if to produce the resource. In today’s data rich environment there is increasing data available for building these models; however, it is often difficult to convert this…

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January 2017

Data Analysis of Induced Seismicity in Western Canada

Hoda Rashedi and Alireza Babaie Mahani

Due to the recent increase in the rate of seismicity in western Canada and central eastern US from oil and gas activities, there is a high demand for data from seismographic networks to understand ground motion variability and assessment of seismic hazard to the critical infrastructure. In western Canada, efforts…

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January 2017

Discussion: Let Geologists Do the Geology!

Robert Pickering

If the seismic tool is intrinsically unaware of geology, why do we depend so heavily on the seismic tool to provide geological answers?

The seismic tool, sonic tool, and the check-shot survey are tools designed to record interval transit times. Geologists do geology. Geology is an observational process from which…

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January 2017

Rock Physics Template (RPT) Technology for Reservoir Characterization and 4D Seismic Monitoring

Albert Kabanda

This paper describes the use of Rock Physics Templates (Avseth et al. 2005) in both reservoir characterization and 4D seismic reservoir monitoring. A major challenge in seismic exploration is the mapping of type, location and extent of hydrocarbon fluids. During reservoir production monitoring, the aim is to follow the temporal…

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December 2016

Three Years of Doing ISM in Western Canada: What Have We Learned?

Dario Baturan

Earthquakes can be induced by human activities such as mining, reservoir or dam impoundment, geothermal reservoir stimulation, wastewater injection, hydraulic fracturing or CO2 sequestration. Such events are predominantly small in magnitude, and are rarely felt locally or detected regionally. However, 16 induced earthquakes of magnitude M3.5 or larger have been recorded…

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December 2016

Introduction to December Focus: Microseismic User Group

Paige Mamer

The Microseismic User Group (MUG) has been active for nearly five years, providing an avenue for those interested in learning more about microseismic topics in an open and educational setting. Since its inception, MUG has brought together geoscientists, engineers and microseismic enthusiasts from oil and gas operating companies, service companies,…

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December 2016

An Analytical Approach to Hydraulic Fracturing and Induced Seismicity Monitoring

John L. J. Duhault

The public’s fears about hydraulic fracturing and subsequent potential for induced seismicity are a growing concern, even in tried and true oil fields of Alberta. The stakeholders need to be shown that a well thought out approach to understanding hydraulic fracturing and potential induced seismicity can be done following a…

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December 2016

Determination of the Stress State – An Additional Benefit of Background Seismicity Monitoring

Zuzana Jechumtálová and Dawid Szafrański

What is the benefit of background seismicity monitoring and how long it should be carried out before subsurface injection? This is a typical question an operator may ask when considering the start of a geothermal, salt water disposal or hydraulic stimulation injection. The usual duration estimate is at least one…

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December 2016

Interpreting Microseismic Data from Hydraulic Fracturing: Understanding Subsurface Deformation Through Numerical Modeling

Neda Boroumand and David Eaton

This article is a summary of the results presented in the PhD Thesis written by Boroumand (2016). The developments made in the research sought to find an answer to the question “why and how did the hydraulic fracture(s) grow in a particular direction?” It makes specific use of microseismic observations…

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December 2016

Beyond the Microseismic Clouds: A Comprehensive Approach to Unconventional Gas Development

Jason Hendrick, Adam Baig, Eric von Lunen, and Ted Urbancic

The development of shale and tight sand resource plays over the past decade has dramatically changed the oil and gas industry. Advances in hydraulic fracturing technologies have unlocked vast unconventional hydrocarbon resources. Unfortunately, the vast supply (together with other external factors) has led to a price collapse that has plunged…

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December 2016

CSEG 2017/2018 Executive Election

Summary of candidates for the 2017/2018 CSEG Executive election.

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December 2016

GeoVectra

The GeoVectra Team

This article has evolved from its original idea quite substantially. At first we were planning to do an interview with GeoVectra president Mike Hall, and then we decided to show the story of one successful company during the downturn. When we started writing it, we started to think about the…