Different Orders of Unconformities and Their Oil-Gas Accumulations in Bohai Bay Basin

Abstract

Abstract: Based on the characteristics of tectonic movement and sequence stratigraphy in Bohai Bay basin, the stratigraphic trap development and oil-gas accumulation related with unconformities are presented. It is suggested that there are two first-order unconformities in the basin, i.e. Neogene/Paleogene and Paleogene/Mz-Pz unconformities. The former contains overlap trap reservoir in the sag's steep slope belt, and both overlap trap and unconformable barrier reservoirs in the ramp belt. The latter contains the buried hill reservoirs in swell and sub-swell. In the Paleogene, there are three second-order and ten third-order unconformities, and the stratigraphic reservoirs occur above and beneath the second-order unconformities, while the stratigraphic reservoirs related to the third-order unconformities appear in small scale and many numbers. Hence they are the main targets for recent fine exploration here. Through many- year exploratory practices in Jiyang depression, numerous such stratigraphic reservoirs have been discovered, making great contributions to the energy strategy for keeping a stable production in eastern China.

Key words: Bohai Bay basin, unconformity, unconformity-barrier trap, stratigraphic trap, oil-gas accumulation

CLC Number:

TE112.422

JIN Qiang, YAN Zhao-min, CHENG Fu-qi, SU Chao-guang. Different Orders of Unconformities and Their Oil-Gas Accumulations in Bohai Bay Basin[J]. Xinjiang Petroleum Geology, 2009, 30(4): 440-444.

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