Similarities and differences in geology between the Jiudong and Jiuxi basins in northwestern China and petroleum exploration

Chen, J.

Shiyou Kantan Yu Kaifa = Petroleum Exploration and Development 24(6): 12-16

1997


Accession: 020020587

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Abstract
The Jiudong and Jiuxi basins are piedmont basins of the Qilian folding mountains. There are a lot of similarities in sedimentary strata, potential source rocks and evolutionary history of organic matter between them because their development was controlled by the same regional stress field. Many oil fields in shallow structures have been discovered in the Jiuxi Basin since 1930, but none discovered in the Jiudong Basin. The authors indicate that the main formation for petroleum exploration is in the deep Lower Cretaceous to the east of Heiliang Fault, and the main targets are the Changshaling and Xiaheqing traps and the eastern region along the Heiliang Fault in the Yinger Depression, Jiudong Basin. Despite much petroleum exploration, there is exploration potential in the Jiuxi Basin. Qingxi has profitable conditions for forming fractured oil pools in Silurian buried hills and antiforms and unconformable formation traps in the Cretaceous.