Preliminary Geologic Characterization of West Coast States for Geologic Sequestration

Myer, Larry R.

doi:10.2172/907916

Cited by 3 publications

(2 citation statements)

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“…The target formation for storage is the Etchegoin, a Pliocene-age marine formation comprised of interbedded siltstones, sandstones, and silty sands. In the region of the proposed site, the Etchegoin is ~1000-2000 ft thick and dips ~9• to the southeast [14]. The porosity from neutron logs is measured between 25 and 33% and the permeability is estimated between 1 and 10 mD (Figure 2).…”

Section: Site Characteristicsmentioning

confidence: 99%

“…Using the southern California earthquake catalog, we examined the recent seismic history of the area and explored different metrics to quantify the natural patterns of seismicity. Due to the limited number of stations and sparse event data in the region of the simulated pressure plume, we are not able to conduct statistically significant Gutenberg-Richter mapping to establish a baseline for the natural frequency-magnitude distribution, e.g., [3,14,15]. This could be a useful metric to evaluate changes in seismicity patterns due to injection, but it requires a dense, near-well monitoring network established before the start of injection.…”

Section: Seismic Analysismentioning

confidence: 99%

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Induced Seismicity Hazard Assessment for a Potential CO2 Storage Site in the Southern San Joaquin Basin, CA

Kohli,

Li,

Kim

et al. 2023

GeoHazards

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California’s Central Valley offers vast opportunities for CO2 storage in deep saline aquifers. We conducted an induced seismicity hazard assessment for a potential injection site in the southern San Joaquin Basin for 18 years of injection at 0.68 MtCO2/yr and 100 years of monitoring. We mapped stress, faults, and seismicity in a 30 km radius around the site to build a geomechanical model and resolve the stresses on major faults. From a 3D hydromechanical simulation of the CO2 plume, we calculated the change in pressure over time on these faults and determined the conditions for safe injection. Lacking any subsurface imaging, we also conducted a probabilistic fault slip analysis using numerous random distributions of faults and a range of geomechanical parameters. Our results show that the change in probability of fault slip can be minimized by controlling the size, migration, and magnitude of the pressure plume. We also constructed a seismic catalog for the last 20 years around the site and characterized the natural patterns of seismicity. We use these results to establish criteria for evaluating potential-induced events during the storage period and to develop a traffic light response system. This study represents a first-order procedure to evaluate the seismic hazards presented by CO2 storage and incorporate uncertainties in hydrological and geomechanical parameters.

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Section: Site Characteristicsmentioning

confidence: 99%

Section: Seismic Analysismentioning

confidence: 99%