Analysis of the stress field in the DeSoto canyon Salt Basin for ensuring safe offshore carbon storage
| Autor: | Runar Nygaard, Jack C. Pashin, Jingyao Meng, Avinash Chandra |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Canyon
geography geography.geographical_feature_category Flow (psychology) Hydrostatic pressure Borehole 010501 environmental sciences Management Monitoring Policy and Law 010502 geochemistry & geophysics 01 natural sciences Pollution Industrial and Manufacturing Engineering Stress field Stress (mechanics) General Energy Submarine pipeline Hydrostatic stress Petrology Geology 0105 earth and related environmental sciences |
| Zdroj: | International Journal of Greenhouse Gas Control. 79:279-288 |
| ISSN: | 1750-5836 |
| DOI: | 10.1016/j.ijggc.2018.11.006 |
| Popis: | Offshore geologic CO2 storage offers an attractive option to reduce greenhouse gas emissions. Vast CO2 storage capacity exists in Cretaceous-Neogene sandstone in the DeSoto Canyon Salt Basin. Understanding the stress and pressure regimes in the basin can help evaluate the geomechanical integrity of the formations, thus minimizing the risk of CO2 migrating out of the storage complex. Borehole breakouts were identified using four-arm dipmeter logs. Elongation of the breakouts is aligned with the minimum horizontal compressive stress (Shmin), which tends to be oriented northeast-southwest. Vertical reservoir stresses are influenced by rock and fluid density. Lithostatic and hydrostatic stress each have a power-law relationship to depth. The average lithostatic stress (Sv) gradient is ∼21.4 kPa/m. Hydrostatic pressure gradient increases with brine density to a maximum of ∼12.2 kPa/m. Geometric mean of the Shmin-depth values correspond to an effective Shmin - effective Sv quotient of ∼0.5. Injection pressure can be maintained safely below the estimated effective minimum horizontal stress, thereby reducing the risk of cross-formational flow. Future study should focus on further constraint of geomechanical properties, reservoir integrity, and seal integrity. |
| Databáze: | OpenAIRE |
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