中上扬子地区二叠系烃源岩评价与油气生成  

Permian hydrocarbon source rock evaluation and hydrocarbon generation in middle-upper Yangzi region

作　　者：张云霞[1] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《石油地质与工程》2014年第2期16-19,146,共4页Petroleum Geology and Engineering

基　　金：国家重点基础研究发展规划(973)项目"中国早古生代海相碳酸盐岩层系大型油气田形成机理与分布规律"(2012CB214800)

摘　　要：中上扬子地区经历了多期原型盆地的复合叠加,按照烃源岩有机碳含量下限标准,在49条踏勘剖面及丰富的烃源岩样品分析基础上,分析了中上扬子地区二叠系烃源岩的沉积环境、分布范围、有机地球化学特征及其油气生成。下二叠统烃源岩分布广泛,为一套区域性优质烃源岩,沉积于深水-次深水陆棚,北部为秦岭南部隆起、西部为康滇古陆-宝兴隆起、南部为黔中隆起和东南部为江南雪峰隆起所包围,母质类型以Ⅰ-Ⅱ1型干酪根为主,是四川盆地二叠系、三叠系气藏的重要气源岩;上二叠统烃源岩主要包括龙潭组、大隆组泥质岩夹煤层,为较好烃源岩,分布广泛,母质类型以Ⅱ2-Ⅲ干酪根为主;研究区二叠系烃源岩总体处于高过成熟热演化阶段。Middle-upper Yangzi region has experienced multiphase composite superposition of prototype basin.According to lower limit standard of organic carbon content in the hydrocarbon source rocks,based on the analysis of 49 reconnaissance profiles and rich hydrocarbon source rock samples,the analysis of the Permian hydrocarbon source rocks of middle-upper Yangtze region covering sedimentary environments,distribution range,organic geochemical characteristics and hydrocarbon generation has been carried out.Lower Permian hydrocarbon source rocks are widely distributed,belong to regional high-quality hydrocarbon source rocks,which deposited in the deep water-deep shelf.In north,it is surrounded by Qinling uplift,in west,by Kangdian Gulu-Baoxing uplift,in south,by Qianzhong uplift and in southeast,by Jiangnan xuefeng uplift.Organic types is mainlyⅠ-Ⅱand kerogen type is given priority to type-1.It is an important gas source rock for Permian and Triassic gas reservoir in Sichuan.Hydrocarbon source rocks in Permian system mainly include argillaceous rock of coal seam from Longtan and Dalong formation,and belong to better hydrocarbon source rocks with wide distribution.The parent material type is of type-Ⅱ2-Ⅲkerogen type.The Permian hydrocarbon source rock is generally at high post-mature thermal evolution stage in the study area.

关 键 词：中上扬子地区 烃源岩 有机碳含量下限 深水陆棚 油气运移 

分 类 号：TE112.115[石油与天然气工程—油气勘探]