摘要
我国中西部前陆盆地油气资源丰富,但是资源探明率仅为9.3%,有必要开展油气成藏条件的系统分析,以指导勘探。在综合分析和对比库车、准南、柴北缘和川西等具有代表性的前陆盆地的油气成藏条件的基础上指出,中西部前陆盆地具有以煤系为主的多套源岩,发育非均质储集层,多套多封闭性的盖层,以背斜为主要圈闭;断裂、不整合和高渗透砂体组成良好输导体系,保存条件较差等特点。依据理论分析及勘探实践,优选出4个有利的勘探区带,它们是:①库车前陆冲断带古近系、新近系膏盐岩、膏泥岩之下的完整背斜圈闭;②准南前陆冲断带第二、第三排构造带;③川西北部及南部燕山运动期古隆起、川中平缓褶皱构造带以及深坳陷内部的非常规天然气;④柴北缘冷湖-南八仙构造带。
The foreland basins in central and western regions of China are rich in oil and gas resources, but the discovery rate of resources is only about 9.3%, so it is necessary to carry out systematic analysis of the hydrocarbon accumulation conditions for guiding the oil-gas exploration in the regions. On the basis of comprehensive analyses on hydrocarbon accumulation conditions in the four representative foreland basins, Kuqa basin, southern Junggar basin, western Sichuan basin and northern margin of Qaidam basin, some conclusions are made as follows： The foreland basins in central and western regions of China are characterized by multi-set source rocks dominated by coal measure; heterogeneous reservoirs; multiple and sealing cap rock; anticline traps; unblocked transport system composed of fault, unconformity and highly permeable sand body; and poor conservative conditions, etc. According to these results combined with exploration practice, four favorable exploration zones are selected, these are the integrated anticline traps below the Tertiary gypsum halite, gypsum mudstone in Kuqa foreland thrust belts, the second and the third row structural belts in southern Junggar foreland thrust belt, the unconventional natural gas pools in the Yanshan palaeohigh in north and south of western Sichuan basin, the gentle fold structural belt in central Sichuan basin and the deep depression in Sichuan basin, and the cold lake and Nanbaxian structural belt in northern margin of Qaidam basin.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2007年第1期1-6,共6页
Xinjiang Petroleum Geology
基金
国家"十五"科技攻关课题(2001BA605-06-03)
国家自然基金项目(40472078)
关键词
中国中西部
前陆盆地
油气成藏条件
库车
准南
川西
柴北缘
central and western China
foreland basin
hydrocarbon accumulation condition
Kuqa
southern Junggar basin
western Sichuan basin
northern margin of Qaidam basin
