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AAPG Bulletin, V.
Fractured tight sandstone oil and gas reservoirs: A new play type in the Dongpu depression, Bohai Bay Basin, China
1State Key Laboratory of Petroleum Resource and Prospecting in China Petroleum University, Beijing, People's Republic of China; [email protected]
2Zhongyuan Oilfield Branch, China Petroleum Chemical Corporation, Puyang, People's Republic of China; [email protected]
3College of Geosciences, China University of Petroleum, Beijing, People's Republic of China; [email protected]
4Petroleum Exploration and Production Research Institute, Sinopec, Beijing, People's Republic of China; [email protected]
5College of Geosciences, China University of Petroleum, Beijing, People's Republic of China; [email protected]
Although conventional reservoirs dominate the Bohai Basin, China, a new type of sandstone reservoir also exists in the Dongpu depression that has a low matrix porosity (tight) in which natural fractures govern both permeability and porosity. These fractured sandstones are located on a structurally modified buried hill underlying Paleogene mudstones, and are truncated along an angular unconformity. The fractured sandstone oils of the Triassic Liujiagou, Heshanggou, and Ermaying Formations are derived from the Paleogene Shahejie Formation, which reached peak oil generation and expulsion during the Oligocene to early Miocene (32.8–15.6 Ma). Gas was generated primarily during the Paleogene from Carboniferous and Permian coals. Petrographic evidence suggests that oil and gas emplacement followed the compaction and cementation of the Triassic sandstone reservoirs. Fluid inclusion evidence and burial history analysis suggest that fractures developed before oil emplacement but may have coincided with peak gas generation, which suggests that oil and gas mainly migrated and accumulated in fractures.
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