Journal
TRANSPORT IN POROUS MEDIA
Volume 96, Issue 1, Pages 39-62Publisher
SPRINGER
DOI: 10.1007/s11242-012-0072-3
Keywords
Numerical cementation; Drainage and imbibition; X-ray images; Level set method; Burial history
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Funding
- Exxon Mobil Upstream Research Company, Houston, TX
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In this study, we numerically cemented a segmented X-ray microtomography image of a sandstone to understand changes to pore space connectivity, capillary control on gas, and water distributions, and ultimately production behavior in tight gas sandstone reservoirs. Level set method-based progressive quasi-static algorithm (a state-of-the-art direct simulation of capillarity-dominated fluid displacement) was used to find the gas/water configurations during drainage and imbibition cycles. Further, we account for gas-water interfacial tension changes using 1D burial history model based on available geologic data. We have found the displacement simulation method robust, and that diagenetic changes impart a significantly larger effect on gas trapping compared with interfacial tension changes.
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