Focus Article

A Bayes’ Theorem Tutorial

BRIAN RUSSELL VICE-PRESIDENT, GEOSOFTWARE. BRIAN.RUSSELL@GEOSOFTWARE.COM   Introduction This tutorial is intended to illustrate the power of Bayes’ theorem using a straightforward seismic exploration example. This example will show how to evaluate the effectiveness of combining AVO attribute analysis with drilling results. As a tutorial, it is like many others used in the explanation of Bayes’ theorem, but instead of using examples like apples and oranges or white and black balls, I will use terminology that you can relate to as exploration geoscientists. Even with this relatively simple example, you will find Bayes’ theorem is not an easy concept to understand, [...]

A Bayes’ Theorem Tutorial2024-02-28T22:11:38-07:00

CCS value written in a bowtie

LEE HUNT GEOPHYSICIST, CARBON ALPHA, LHUNT@CARBONALPHA.COM All aspects of a CCS project are tied back to risk management; value in the geosciences, including seismic, are directly related to their role in reducing project risk.   Summary Much of the world is looking to carbon capture and storage (CCS) to reduce anthropogenic carbon dioxide (CO2) emissions. The number of carbon storage projects under development has exploded - with over 200 currently proposed projects worldwide (Hauber, 2023). Geoscientists engaged in subsurface work on these projects are interested in providing the most value possible to these projects. But where is that value added? [...]

CCS value written in a bowtie2024-01-04T21:32:14-07:00

Bandwidth Extension of Seismic Data and its Impact on Seismic Unsupervised Facies Classification

SATINDER CHOPRA SAMIGEO, CALGARY, CANADA, SATINDER.CHOPRA@SAMIGEO.COM RITESH KUMAR SHARMA SAMIGEO, CALGARY, CANADA JOHN P. CASTAGNA THE UNIVERSITY OF HOUSTON, USA KURT J. MARFURT THE UNIVERSITY OF OKLAHOMA, NORMAN Abstract Bandwidth extension of seismic data is a desirable goal when the available data has inadequate frequency content to delineate thin beds, facies changes, and subtle faults. Though significant efforts are expended to preserve frequency content during processing of seismic data, processes such as multi-window statistical deconvolution, inverse-Q filtering, as well as time-varying spectral whitening, are not effective enough when the intervals to be characterized are below tuning. Consequently, methods have been [...]

Bandwidth Extension of Seismic Data and its Impact on Seismic Unsupervised Facies Classification2023-12-19T23:08:45-07:00

Impact of Spectral Balancing of Seismic Data on some Unsupervised Facies Analysis

SATINDER CHOPRA SAMIGEO, CALGARY, SATINDER.CHOPRA@SAMIGEO.COM RITESH KUMAR SHARMA SAMIGEO, CALGARY, RITESH.SHARMA@SAMIGEO.COM KURT J. MARFURT THE UNIVERSITY OF OKLAHOMA, NORMAN HEATHER BEDLE THE UNIVERSITY OF OKLAHOMA, NORMAN ALEXANDRO VERA-ARROYO THE UNIVERSITY OF OKLAHOMA, NORMAN Abstract The interpretation of discrete stratigraphic features on seismic data is limited by its bandwidth and its signal-to-noise ratio. Unfortunately, well-resolved reflections from the top and base of subtle stratigraphic geologic boundaries occur only for features thick enough to be imaged by the bandlimited data. In contrast, seismically thin stratigraphic features approaching a quarter-wavelength in thickness give rise to composite, or “tuned,” seismic reflections. Data conditioning to [...]

Impact of Spectral Balancing of Seismic Data on some Unsupervised Facies Analysis2023-11-02T22:55:19-06:00

Quantifying Saturation in the Sleipner CO2 Storage: A Rock Physics-Based Approach for Seismic Data Analysis

MANZAR FAWAD KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS (KFUPM)/ RESEARCH SCIENTIST II, MANZAR.FAWAD@KFUPM.EDU.SA NAZMUL HAQUE MONDOL UNIVERSITY OF OSLO/ PROFESSOR, M.N.H.MONDOL@GEO.UIO.NO NORWEGIAN GEOTECHNICAL INSTITUTE/ ADVISOR-ADJUNCT POSITION, NHM@NGI.NO Abstract This research aims to evaluate the underground CO2 storage site at Sleipner in the North Sea, Norway, by applying a newly proposed rock physics model to extract saturation from seismic data. Our focus is the CO2 storage reservoir unit of the Utsira Formation (a shallow saline formation where CO2 from produced natural gas is injected and stored) to validate the new rock physics model. The saturation information was used to determine [...]

Quantifying Saturation in the Sleipner CO2 Storage: A Rock Physics-Based Approach for Seismic Data Analysis2023-10-12T20:58:16-06:00

Geophysical Field Schools at the University of Saskatchewan

IGOR MOROZOV, JIM MERRIAM, and SAM BUTLER UNIVERSITY OF SASKATCHEWAN, DEPTARTMENT OF GEOLOGICAL SCIENCES, SASKATOON, SK, CANADA, IGOR.MOROZOV@USASK.CA Abstract Mineral resources are a foundation of the economy in western Canada and particularly in Saskatchewan. With recent changes in the markets and emphasis on sustainability and the green economy, there is an increasing demand for geophysics professionals. This article gives an overview of the geophysics program at the University of Saskatchewan and describes how it meets these new challenges. Field schools designed around continuous data acquisition projects have been the central element of our program for many years. This article gives [...]

Geophysical Field Schools at the University of Saskatchewan2023-10-03T12:26:19-06:00

PSDM velocity model building using a Deep Convolutional Neural Network

GREG CAMERONTHRUST BELT IMAGING, GREG@TBI.CAAbstractBuilding PSDM velocity models in complex structure land environments is difficult. A machine-learning method using a convolutional neural network (CNN) incorporates both human and artificial intelligence to overcome these difficulties. The supervised learning process used a large representative dataset to train the CNN, learning the convolutional weights that best map the input seismic shot records to the target velocity model. With careful consideration of both training data and network architecture, the CNN can accurately predict velocity models on both synthetic and field data.IntroductionConvolutional neural networks have been successfully used for many tasks, from computer vision to natural [...]

PSDM velocity model building using a Deep Convolutional Neural Network2023-09-26T12:09:57-06:00

CCS expertise and analogical reasoning

LEE HUNT CARBON ALPHA, LHUNT@CARBONALPHA.COM ERIC STREET CARBON ALPHA GRAHAM HACK CARBON ALPHA We provoke the development of geoscientific expertise for the early stages of CCS through analogy with fields that geoscientists already command. Introduction Recently, there has been a tremendous increase of interest in the safe and permanent underground storage of carbon dioxide (CCS). This has been driven by governmental enactment of climate goals in many parts of the world. These goals have been powerfully manifested in several ways, including through penalties and incentives. Canadian efforts in this regard have included the Government of Canada’s (GOC) rapidly escalating carbon [...]

CCS expertise and analogical reasoning2023-09-07T20:18:23-06:00

Lithium Exploration: Successes and Challenges into the 21st Century

KATHLEEN DOREY, H.BSC. PETREL ROBERTSON CONSULTING LTD., KDOREY@PETRELROB.COM Introduction While many people think of lithium only in the context of batteries, it is a critical mineral supporting development of diverse new technologies in the 21st century. Global supply chains of years past must be rapidly expanded to meet new demands. Traditionally, lithium has been produced from both hard-rock mines and from highly saline brines brought to the surface and concentrated through evaporation. New mines can be developed, but surface concentration of lithium brines is limited to specific areas and is coming under increased environmental scrutiny. To address the demand, exploration [...]

Lithium Exploration: Successes and Challenges into the 21st Century2023-06-29T17:04:55-06:00

Geophysics at the University of Alberta: A longstanding and vibrant tradition

MIRKO VAN DER BAAN DEPARTMENT OF PHYSICS, UNIVERSITY OF ALBERTA, EDMONTON, ALBERTA, CANADA. MIRKO.VANDERBAAN@UALBERTA.CA Introduction Geophysical research at the University of Alberta has a long and rich history, starting in 1954, investigating both applied and fundamental questions such as: Why do the Earth and planets have magnetic fields? Can we forecast earthquakes? What was the climate like in the past? How did plate tectonics form the Rocky Mountains? How do we locate hydrocarbons and other resources underground? Does hydraulic fracturing cause earthquakes? Is geothermal energy an option for Canada? What happens to CO2 stored underground? The early years: The 1950s [...]

Geophysics at the University of Alberta: A longstanding and vibrant tradition2023-05-19T12:31:41-06:00

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