Assessing Caprock Integrity through Thermo-Hydro-Mechanical Modeling of CO2 in a Deformable Chalk Depleted Gas Reservoir

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Abstract

This paper presents a hydromechanical simulation of large-scale analysis to assess the risk of CO2 leakage through faults within the reservoir and caprock as potential pathways. The study involves the evaluation of slip tendency and distance to failure of existing faults in both the caprock and reservoir, which are crucial parameters influencing the potential for induced seismicity. To that aim, thermo-hydro-mechanical simulation of cold CO2 injection close to the cap rock and within a hightemperature (110°C) depleted gas reservoir is carried out to quantify the additional stresses and strains caused by the thermal expansion/contraction of the rocks. Since preferential fluid flow is more pronounced through faults and fractures experiencing high slip tendency, here the assessment of slip tendency shows no concerns regarding fault seal and the behavior of faults as pathways for the migration of CO2 injection. In addition, this study utilizes distance to failure analysis by driving data from analyses of stress orientation, magnitude, fault geometry, and temperature. The findings indicate that there are no significant concerns regarding the integrity of fault seals or the behavior of faults as potential routes for CO2 injection migration.
Original languageEnglish
Title of host publicationProceedings of the 58th U.S. Rock Mechanics/Geomechanics Symposium
PublisherAmerican Rock Mechanics Association (ARMA)
Publication date2024
Article numberARMA 24–507
ISBN (Electronic)978-0-9794975-9-9
DOIs
Publication statusPublished - 2024
Event58th U.S. Rock Mechanics/Geomechanics Symposium - Golden, United States
Duration: 23 Jun 202426 Jun 2024
Conference number: 58

Conference

Conference58th U.S. Rock Mechanics/Geomechanics Symposium
Number58
Country/TerritoryUnited States
CityGolden
Period23/06/202426/06/2024

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