Filling model of lowstand system tract of Cretaceous Qingshuihe Formation in Fukang Sag in Junggar Basin and its signifi cance on petroleum exploration

doi:10.3969/j.issn.1672-7703.2021.05.007

Abstract

Abstract: The deposition conditions, sedimentary characteristics and deposition pattern of lowstand system tract sandstone are
analyzed and hydrocarbon accumulation conditions studied, so as to identify the development degree of lowstand system tract
sandstone of Qingshuihe Formation in Fukang Sag in Junggar Basin and its exploration potential. The study results show that base
Cretaceous Qingshuihe Formation is a third-order sequence boundary, and multi-stage slope breaks are developed near the
depo-center of Fukang Sag, providing favorable conditions for the deposition of lowstand system tract sandstone. Multi-stage
lowstand system tract sandstones are developed below the slope break of large-scale depressed lake basin, with large thickness,
widespread area, superior reservoir physical property and lateral sealing capacity, which have good conditions for developing
lithologic traps. In addition, two sets of faults are developed in deep and shallow formations, forming a “Y” shaped configuration
in vertical direction, and connecting source rock with lowstand system tract sand bodies. As a result, the lowstand system tract fan
sand body in the study area has excellent hydrocarbon accumulation conditions, which is the most favorable field for lithologic oil
reservoir exploration in the near future.

CLC Number:

TE111

Hou Gangfu, Song Bing, Chen Yang, Wang Libao, Zeng Delong, Jia Kaifu, Dou Yang, Li Yazhe, Chen Xiguang, Peng Bo, Guo Huajun, Zou Zhiwen. Filling model of lowstand system tract of Cretaceous Qingshuihe Formation in Fukang Sag in Junggar Basin and its signifi cance on petroleum exploration[J]. China Petroleum Exploration, 2021, 26(5): 74-82.

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