塔里木盆地三道桥地区油气成藏特征  

Characteristics of hydrocarbon accumulation in the Sandaoqiao area of Tarim Basin

作　　者：韩强[1] 李宗杰[1] 杨子川[1] 闫亮[1] 石媛媛[1] 苏娟[1] 

机构地区：[1]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《油气地质与采收率》2015年第6期14-20,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"塔里木海相碳酸盐岩优质储层地球物理预测技术及应用"(2011ZX05005-002-001);中国石化先导项目"天山南地区圈闭目标落实与关键技术研究"(2010KTXD03)

摘　　要：为明确塔里木盆地沙雅隆起北部雅克拉断凸西段三道桥地区的油气成藏特征,综合前人研究成果,对研究区新获油气井的原油物性、甾萜烷生物标志化合物等原油地球化学及流体包裹体特征进行对比分析。结果表明,三道桥地区为南、北2个油气生烃灶的有利运移指向区,其海、陆相原油的主成藏期均为喜马拉雅期。海、陆相油气在平面上的分布差异受控于研究区前中生界的地质结构,以前中生界断凸屋脊核部为界;断凸脊部以南桥古1井和桥古102井的原油具有相对低蜡、高硫特征,色谱—质谱分析结果表明,其C19—C21三环萜烷丰度相对较高,以C23三环萜烷为主峰,富含硫芴,形成于还原环境,为海相原油特征;断凸脊部及其以北的桥古3井和沙53井原油则相反,表现为陆相原油特征。In order to ascertain the hydrocarbon accumulation characteristics in the Sandaoqiao area of the western Yakela faulted uplift in northern Tarim Basin,based on previous achievement,the oil geochemistry features such as physical property of crude oil,steranes and terpanes biomarkers and the fluid inclusions obtained from new wells drilled in the study area have been comparatively analyzed. The results show that there are respectively continental and marine hydrocarbon sources in this area where hydrocarbons are likely to migrate into. And the main periods when the continental and the marine hydrocarbon were generated are both in Himalaya period in this area. The different distributions of these oil and gas are controlled by the pre-Mesozoic geological structure. The boundary of the continental and marine oil is in the convex ridge of the Pre- Mesozoic anticline. The physical properties and geochemical characteristics of crude oil from Well Qiaogu1 and Qiaogu102 in the south convex-ridge are relatively low wax and high sulfur. GC-MS analysis results suggest that the C19-C21 tricyclic terpane is relatively high with C23 as the main peak of tricyclic terpane and the oil is also rich in sulphur fluorine. These physical properties and geochemical characteristics of crude oil from Well Qiaogu1 and Qiaogu102 show that it came from the marine hydrocarbon source of the southern carbonate. On the contrary,the physical and geochemical features of the crude oil obtained from Well Qiaogu3 and Well Sha53 drilled at the north of the area are different which indicate continental sourced crude oil.

关 键 词：油气成藏 原油地球化学特征 流体包裹体 三道桥地区 雅克拉断凸 塔里木盆地 

分 类 号：TE111.2[石油与天然气工程—油气勘探]