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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI:10.1306/10011211181
Measuring and modeling
fault
density for CO2 storage plume-
fault
encounter probability estimation
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Preston D. Jordan,1 Curtis M. Oldenburg,2 Jean-Philippe Nicot3
1Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720; [email protected]
2Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720; [email protected]
3Bureau of Economic Geology, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas 78713; [email protected]
ABSTRACT
Emission of carbon dioxide (CO2) from fossil-fueled power generation stations contributes to global climate change. Capture of CO2 from such stationary sources and storage within the pores of geologic strata (geologic carbon storage) is one approach to mitigating anthropogenic climate change. The large storage volume needed for this approach to be effective requires injection into pore space saturated with saline water in reservoir strata overlain by cap rocks. One of the main concerns regarding storage in such rocks is leakage via faults. Such leakage requires, first, that the CO2 plume encounter a fault
and, second, that the properties of the
fault
allow CO2 to flow upward. Considering only the first step of encounter,
fault
population statistics suggest an approach to calculate the probability of a plume encountering a
fault
, particularly in the early site-selection stage when site-specific characterization data may be lacking. The resulting
fault
encounter probability approach is applied to a case study in the southern part of the San Joaquin Basin, California. The CO2 plume from a previously planned injection was calculated to have a 4.1% chance of encountering a fully seal offsetting
fault
and a 9% chance of encountering a
fault
with a throw half the seal thickness. Subsequently available information indicated the presence of a half-seal offsetting
fault
at a location 2.8 km (1.7 mi) northeast of the injection site. The encounter probability for a plume large enough to encounter a
fault
with this throw at this distance from the injection site is 25%, providing a single before and after test of the encounter probability estimation method.
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