Depositonal systems in the Middle Jurassic Shaximiao Formation in the central part of western Sichuan depression
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摘要: 中侏罗统沙溪庙组沉积体系的研究对川西拗陷中段气藏的勘探和开发具有重要的指导意义。通过物源研究、地震分析得出该区沙溪庙组可划分为东、西两个沉积体系,西部龙门山短轴物源控制的沉积体系主要由冲积扇-冲积平原(辫状河)-辫状河三角洲-湖泊等亚相组成;东部的长轴物源控制的沉积体系主要由冲积平原(曲流河)-曲流河三角洲-湖泊等亚相组成。这一新的认识对川西拗陷中段中侏罗统沙溪庙组的深入勘探和已发现气藏的开发具有一定的指导意义。Abstract: In the light the provenance and seismic analysis, two depositonal systems are recognized for the Middle Jurassic Shaximiao Formation in the central part of western Sichuan depression, including the alluvial fan-alluvial plain (braided stream) -braided delta-lake depositonal system controlled by the Longmenshan provenance in the western part, and alluvial plain (meandering stream) -meandering delta-lake depositonal system controlled by the Micangshan-Dabashan provenance in the eastern part. The oil and gas accumulations reside mostly in the meandering stream-meandering delta depositonal system in the eastern part. Our knowledge of the depositonal systems in this study may be helpful to the future exploration and development of the oil and gas resources in the study area.
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Keywords:
- western Sichuan depression /
- Shaximiao Formation /
- depositonal system
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