Depositional System of Lower Jurassic Baitianba Formation in Northwestern Sichuan Basin
详细信息
- 责任者：He Jiang (College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Hu Xin
- 刊名：Petroleum Geology & Experiment
- 出版年：2013
- 卷期：35(5)
- 关键词：砂岩储集层 ; sandstone reservoirs ; 沉积体系 ; depositional system ; 四川盆地 ; Sichuan Basin
- 页码：p.515-522
- 图表：7 illus., 1 table, 22 refs.
- 分类号：1003
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
Glutenite reservoirs are widespread in the Baitianba Formation of the Lower Jurassic in the northwestern Sichuan Basin,showing a new field for expanding exploration of intrabasinal clastic rock gas pools. Based on detailed field profile observation,tracking contrast of strata and glutenite,and fine description of typical phase sequence,systematic studies of geologic background,source distribution,depositional system and evolution mode have been carried out. During the late Triassic,the Indosinian Movement laid the palaeostructure pattern of "steep west and gentle north"in early deposits of the Lower Jurassic in the northwestern Sichuan Basin. In the front of the Micang Mountain in the northeast,there was a closed stair-step thrust fold belt and the deformation intensity decreased progressively to the basin,which was favorable for the long distance transportation of deposits and served as the main sources. In the Longmen Mountain in the northwest,compressive orogenic activities took place,leading to steep terrain. Different sizes of alluvial fans formed from seasonal mountain stream before mountain,serving as the secondary sources. From mountain front to basin center,a depositional system from alluvial fan,fan delta to lacustrine developed.
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