古地理学报2025，Vol.27Issue(4)：870-885,16.DOI:10.7605/gdlxb.2025.019
塔西南山前地区甫沙断陷侏罗系物源与沉积相
Provenance and sedimentary facies of the Jurassic in Fusha fault depression,piedmont area of southwestern Tarim Basin
摘要
Abstract
A significant breakthrough in the exploration of Jurassic sandstone oil and gas was achieved in well Fusha 8,located in the piedmont area of the southwestern Tarim Basin.However,the overall exploration level of the Jurassic remains low.The characteristics of the provenance and the sedimentary systems within the basin are still unclear,which hinders the process of exploration.This paper uses logging data,core samples,and seismic data to clarify the types and distribution of sedimentary facies through a systematic analysis of the Jurassic provenance characteristics in the Fusha fault depression.It is concluded that there are two major provenance systems in the Jurassic strata of the Fusha fault depression:the western Kunlun Mountains in the south exhibit a strong provenance supply capacity,while the northern slope area displays a weaker provenance.The provenance areas are mainly composed of Proterozoic metamorphic rocks,Paleozoic magmatic rocks and Permian sedimentary rocks.The Jurassic basin underwent a complete rifting cycle,which can be categorized into three evolution stages:the initial rifting stage,the intense rifting stage,and the rifting-depression transition stage.In the study area,three sedimentary facies were identified:fan delta,braided river delta and lacustrine facies.The southern steep slope zone mainly develops an alluvial fan-fan delta-lacustrine sedimentary system,while the northern gentle slope zone is mainly characterized by a braided river delta-lacustrine sedimentary system.The distribution of the Jurassic sedimentary system in the Fusha fault depression,located in the piedmont area of the southwestern Tarim Basin,exhibits vertical inheritance development,and is influenced by factors such as palaeogeomorphology,provenance supply,and basin rifting activities.Based on this research,it is proposed that the braided river delta sandbodies controlled by the southern tectonic transition zone during the sedimentary period of the Shalitashi Formation(initial rifting stage)represent favorable exploration targets within the region.关键词
物源分析/沉积相/甫沙断陷/侏罗系/塔里木盆地Key words
provenance analysis/sedimentary facies/Fusha fault depression/Jurassic/Tarim Basin分类
天文与地球科学引用本文复制引用
黎立,孙春燕,董尧,罗强,屈洋,朱世发..塔西南山前地区甫沙断陷侏罗系物源与沉积相[J].古地理学报,2025,27(4):870-885,16.基金项目
中国石油天然气集团有限公司科技项目"超深层碎屑岩油气分布规律与区带目标优选"(编号:2023ZZ14YJ02)资助.[Financially supported by the Science and Technology Project of China National Petroleun Corporation"Oil and gas distribution and zone target optimization of ultra-deep clastic rock"(No.2023ZZ14YJ02)] （编号:2023ZZ14YJ02）
