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Ahead of Print Abstract
AAPG Bulletin, Preliminary version published online
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DOI:10.1306/02102625089
Fault 
seal
behavior in porous sandstones: A case study from the Bozhong subbasin, Bohai Bay Basin, China
seal behavior in porous sandstones: A case study from the Bozhong subbasin, Bohai Bay Basin, ChinaXianqiang Song, Zhida Liu, Xiaofei Fu, Haixue Wang, and Peng Xu
Ahead of Print Abstract
seal hydrocarbons, with the maximum sealable hydrocarbon column height reaching 83 m and the buoyancy pressure reaching 0.223 MPa. Owing to the low clay content (15%), and moderate burial depth (1–3 km) of the host rock, cataclasis associated with fault deformation may generate low-permeability cataclasite, which is regarded as the most probable sealing mechanism for faults in porous sandstone. Increased effective fault normal stress during fault movements intensifies sandstone grain cataclasis, further reducing fault permeability and enhancing the fault sealing capacity. A positive correlation was identified between fault sealable buoyancy pressure and effective fault normal stress. These findings highlight the importance of considering stress effects, in addition to clay content, when evaluating the sealing capacity of faults in sand–mudstone sequences. Neglecting the role of stress may lead to underestimation of the fault sealing potential, particularly for faults in porous sandstones. More research is needed to evaluate the sealing capacity of faults in porous sandstone. In addition, data sharing and cooperation between industry and academia should be encouraged so that, in the long run, workflows can be developed specifically for faults in porous sandstones.
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