Provenance and Sedimentary Facies Evolution of Penglaizhen Formation in the Middle Part of West Sichuan Depression
详细信息
- 责任者：Qian Lijun (State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Chen Hongde
- 刊名：Journal of Chengdu University of Technology
- 出版年：2013
- 卷期：40(1)
- 关键词：物源分析 ; provenance analysis ; 沉积相 ; sedimentary facies ; 砂体 ; sand bodies ; 四川盆地 ; Sichuan Basin
- 页码：p.15-24
- 图表：illus., 1 table, 16 refs.
- 分类号：1003
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
Based on the field profile observation,this paper studies the provenance,types of sedimentary facies and the characteristics and evolution rules of the sedimentary environment of the Upper Jurassic Penglaizhen Formation in the middle part of the West Sichuan depression.The results indicate that: 1) according to the analyses of the clastic constituents of sandstone and the tectonic background of provenance,there are the characteristics in study area that the ratio of quartz in sandstones increases gradually while the ratio of debris in sedimentary rocks decreases gradually from the leading edge of Longmenshan to the middle part of the basin and that the provenance is mainly Longmenshan in the west of study area,while the Micang-Daba mountains in the north contribute little; 2) there develop mainly alluvial fans,fluvial,braid river deltas,lakes sedimentary systems in Upper Jurassic Penglaizhen Formation in the middle part of the West Sichuan depression; and 3) people have drawn the contour map of ratio of sandstone and the sedimentary facies diagram of Penglaizhen Formation in the middle part of the West Sichuan depression.They indicate that the sedimentary environment,sand bodies and distribution patterns in the different sedimentary periods of Panglaizhen Formation were mainly controlled by the fluctuation of lake level and the supply of provenance.
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