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Geomechanical Effects of CO2 Saturated Brine on Reservoir and Seal Rocks

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Course Credit: 0.15 CEU, 1.5 PDH

Reducing the amount of CO2 in our atmosphere is a critical goal that we all recognize as essential. Addressing the issue requires careful consideration of different reservoirs that can be utilized for sequestration purposes, including coal seams, enhanced oil recovery, depleted hydrocarbon reservoirs, and deep saline aquifers. Currently, there is a growing interest in deep saline aquifers due to their vast storage potential and the absence of previous penetrations that may lead to CO2 leakage. Nevertheless, the long-term consequences of CO2 injection on the seal and reservoir rocks remain uncertain, specifically with respect to water pH levels. Research suggests that significant CO2 equilibration with lowsalinity waters could result in the pH of brine reaching 3.5 pH, exhibiting a deleterious effect on calcite, potassium feldspars and high surface area clay minerals. Furthermore, multiple minerals could be adversely impacted by prolonged exposure to CO2. Fortunately, software packages such as PHREEQC and OLI permit static and dynamic geochemical models, while established core analysis methods can assess variations in strength, texture, and visual appearance of both seal and injection reservoir rocks. As such, we will delve into these conventional core analysis methods to evaluate potential changes in rocks with very low permeability and porosity, as well as high-quality target injection reservoirs. All content contained within this webinar is copyrighted by Kory Holmes and its use and/or reproduction outside the portal requires express permission from Kory Holmes.

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Course Chapters

  • 1Geomechanical Effects of CO2 Saturated Brine on Reservoir and Seal Rocks - Chapter 1
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Earn credits by completing this course0.15 CEU credit1.5 PDH credits


Kory HolmesKory Holmes is a Technical Director for the Petroleum Services division of Core Laboratories in their Houston office. He graduated from the West Texas State University with a BS degree in geology in 1985 and began his career with C W Logging Services in Midland Texas as a wellsite Geologist. He joined Core Laboratories in 1991, and has held a variety of laboratory, supervisor and managerial positions, including Technical Manager for the Flow Studies Group. In 2010, Kory began helping John Dacy, Core Laboratories’ primary instructor, present Core Analysis seminars on the technology and applications of Advanced Rock Properties. As a Technical Director, he provides remote and on-site support to Core Lab’s worldwide network of rock properties laboratories on issues of technology transfer, testing protocols, data applications, and quality assurance.
S. Mark MaS. Mark Ma is currently a Senior Consultant at Reservoir Description Division, Saudi Aramco, responsible for petrophysical supports and technology development. Before joining Aramco in 2000, Mark worked as a core analyst at Exxon Production Research Company, Wyoming Western Research Institute, and New Mexico Petroleum Recovery Research Center and as a teacher at Jianghan Petroleum Institute in China. Ma received his bachelor’s degree from China Petroleum University, MS and PhD from New Mexico Tech, all in petroleum engineering. A Petrophysics Associated Editor and a JPT Editor, Mark is SPWLA Saudi Chapter VP for technical events, SPWLA Regional Director (2018-20), SPE FE Award Committee Chair (2013), SPE ATCE FE Committee Chair (2018), IPTC Ed Week Committee Co-Chair (2019), and has published widely. In the last two decades, Mark has received a few awards including the 2010 SPE KSA Technical Contribution award, 2019 SPE MENA regional FE award, 2020 SPE Distinguished Membership award, 2021 SPWLA Distinguished Service award, and 2022 SPWLA Distinguished Technical Achievement award.