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- Title
四川盆地平昌地区侏罗系大安寨段 沉积特征及演化模式.
- Authors
孙志民; 胡明毅; 邓庆杰; 熊 壮; 蔡全升; 何嘉郁
- Abstract
Jurassic Da’anzhai Member in Sichuan Basin is rich in oil and gas resources and is an important horizon for tight oil exploration and development. At present, the exploration and research work for Da’anzhai Member is mainly concentrated in central Sichuan Basin, and there is less research for northeast Sichuan Basin, which restricts the tight oil exploration process in this area. Based on the data of field outcrop, cores, thin sections and logging, this paper studies the sedimentary characteristics and sedimentary evolution of Da’anzhai Member. The results show that the sedimentary structure of Da’anzhai Member of Lower Jurassic Ziliujing Formation in Pingchang area of northeast Sichuan Basin is relatively stable, with complete water inflow and regression cycles and lack of terrigenous clastic material supply. It is characterized by lacustrine carbonate rocks and shale, and mainly develops semi-deep lake and shallow lake sub-facies. Controlled by the change of lake level, shell limestone and dark shale are developed alternately. Da 3 sub-member and Da 1 sub-member are mainly medium thick shell limestone and shell bearing mudstone, which are shallow lake shell beach microfacies and can be good reservoirs. The lithology of Da 2 sub-member is mainly a large set of dark shale with thin argillaceous shell limestone, which is a semi-deep lake sedimentary environment. Shale has high organic matter abundance and can be good source rock. The thick shell shoals in Da 3 sub-member and Da 1 sub-member in Pingchang area are favorite targets for tight oil exploration. The research results provide strong basis for oil and gas exploration of Jurassic Da’anzhai Member in Pingchang area in Sichuan Basin.
- Publication
Petroleum Geology & Oilfield Development in Daqing, 2022, Vol 41, Issue 6, p32
- ISSN
1000-3754
- Publication type
Article
- DOI
10.19597/J.ISSN.1000-3754.202108019