Journal
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
Volume 90, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2019.102820
Keywords
Carbon capture and sequestration; CCS; Fault stress; Stress model; East Irish Sea; UKCS
Categories
Funding
- Welsh Government
- HEFCW through the Ser Cymru National Research Network for Low Carbon, Energy and the Environment (NRN-LCEE), via Geo-Carb-Cymru Cluster
- NERC [bgs05017] Funding Source: UKRI
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Carbon Capture and Storage (CCS) is a key technology for a low-carbon energy future and will have an important role on the economic future of the UK Continental Shelf (UKCS). The East Irish Sea Basin (EISB) is a prospective area for CCS in the western UKCS. 3D seismic from the EISB were used in this study to characterise the fault network and potential fault reactivation risks associated with CO2 injection. Two main structural domains are present: a Northern domain with NW-SE faults, and a Southern domain with faults following a N-S orientation. The main storage sites consist of structural closures in Triassic strata of the Sherwood Sandstone Formation (SSF), overlain by alternations of mudstones and evaporites of the Triassic Mercia Mudstone Group (MMG). The closures occur predominantly at fault-bounded horsts, with adjacent grabens filled by thick sequences of the Triassic Mercia Mudstone Group (MMG). The fault framework was used to test, in 3D, the stress model published for the EISB and assess the fault reactivation risk associated with CO2 storage. Slip tendency values were pre-dominantly below 0.6, suggesting the presence of stable structures in the EISB. Under the tested conditions, faults are capable of withstanding pressure increases between 3 MPa and 10 MPa before the onset of slip. The limited fault reactivation risk suggests CCS operations are suitable prospects for the EISB. This work demonstrates the additional value gained from integration of accurately constrained fault geometries in 3D stress models.
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