羌塘盆地中侏罗统布曲组烃源岩评价  

Evaluation of middle Jurassic Buqu formation source rock,Qiangtang basin,north Tibet

作　　者：南征兵[1] 张艳玲[2] 李永铁[1] 郭祖军[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国地质环境监测院,北京100081

出　　处：《油气地质与采收率》2012年第3期15-17,21,共4页Petroleum Geology and Recovery Efficiency

摘　　要：迄今为止羌塘盆地已发现200多处油气显示点,其中5处为液态油苗,多处为油页岩,表明盆地已具备生烃基础。中侏罗统布曲组烃源岩在羌塘盆地广泛分布,岩性以碳酸盐岩为主,厚度从几十米到几百米不等,有机碳含量平均为0.117%～0.68%,以中等—好烃源岩为主,少数为较差烃源岩;泥质烃源岩有机碳含量平均为0.44%～4.64%,各剖面差别较大,较差—好烃源岩均有。干酪根显微组分分析结果表明,布曲组烃源岩干酪根显微组分以腐泥组为主,各剖面腐泥组平均含量为62%～88%。布曲组碳酸盐岩烃源岩有机质类型以Ⅱ_1型为主,部分Ⅰ型和少量Ⅱ_2型;泥质烃源岩以Ⅱ_2型为主,少量Ⅱ_1型。布曲组烃源岩镜质组反射率平均为0.98%～3.12%,有机质处于成熟一过成熟阶段。综合评价结果表明,布曲组为盆地最有利生烃层位,主要分布于北羌塘坳陷的中西部地区。More than 200 oil and gas shows are discovered so far in the Qiangtang Basin,including 5 oil shows and abundant oil shale shows.It indicates that the source rocks have favorable conditions to form gas and oil in the Qiangtang basin.The main source rock of Middle Jurassic Buqu formation is carbonate rocks.Its thickness is from tens meters to hundred meters.The mean content of organic carbon is 0.12 to 0.68,and it is mainly medium to good source rock.The following source rock is mudstone, its mean content of organic carbon is 0.44%to 4.64%,it is also good source rock.The organic matter type isⅡ_1 through kerogen analysis.The vitrinite reflectance is 0.98 to 3.12,and the source rock is at stage of mature to post maturity.The research results show that Buqu formation source rock is the best in the basin,and it is mainly distributed in the middle and west of north Qiangtang depression.

关 键 词：烃源岩 有机质丰度 有机质类型 成熟度 布曲组 羌塘盆地 

分 类 号：TE112.115[石油与天然气工程—油气勘探]