川东北及邻区上二叠统吴家坪组烃源岩评价  

Evaluation of Source Rocks in Upper Permian Wujiaping Formation of Northeast Sichuan and Its Adjacent Area

作　　者：冯冲[1,2] 邹华耀[1] 郭彤楼[3] 朱扬明[4] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油天然气股份有限公司新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [3]中国石油化工股份有限公司勘探南方分公司,四川成都610041 [4]浙江大学地球科学系,浙江杭州310027

出　　处：《地球科学与环境学报》2013年第4期18-29,共12页Journal of Earth Sciences and Environment

基　　金：国家科技重大专项项目(2011ZX05005-003-009HZ)

摘　　要：川东北及邻区上二叠统吴家坪组烃源岩为二叠系—三叠系碳酸盐岩大中型气田的主要气源。利用烃源岩样品的地球化学、测井、岩屑录井资料,分析吴家坪组烃源岩的地球化学特征、沉积环境特征和生烃潜力,研究吴家坪组烃源岩的丰度、类型和成熟度,预测烃源岩的厚度,划分烃源岩沉积相类型,讨论烃源岩形成的环境并计算烃源岩的生气强度。结果表明:川东北及邻区吴家坪组烃源岩有机质丰度大,现今在高成熟晚期至过成熟演化阶段,干酪根类型以Ⅱ型为主,烃源岩主要发育在泥质含量高的层段;烃源岩厚度在本区相差很大,达州—开江以北地区厚度最大可达171m,垫江—石柱以南地区厚度小于20m;烃源岩发育受沉积环境的控制,优质烃源岩主要发育在海湾环境中;宣汉—达州—巴中—通江附近地区的吴家坪组烃源岩生气强度大,满足形成大中型气田的烃源岩条件。The source rock in Upper Permian Wujiaping Formation of Northeast Sichuan and its adjacent area is the main gas source of Permian-Triassic large and middle carbonate gas fields. According to the geochemical, logging and sample logging data of source rock, the geochemical characteristics, sedimentary environment and hydrocarbon potential of source rock in Wujiaping Formation were analyzed; the abundance, types and maturity of source rock were studied; the thicknesses of source rock were predicted; the sedimentary facies was divided; the formation environments of source rock were discussed; and the generation intensity of source rock was calculated. The results show that the organic matter abundance of source rock in Wujiaping Formation is large, the present source rock is from the late high mature to overmature evolution stages, the kerogen is mainly type II, and source rock mainly develops in high argilliferous segment; the thicknesses of source rock are different, the thickest exceeds 171 m in the north of Dazhou-Kaijiang area, and the thinnest is less than 20 m in the south of Dianjiang-Shizhu area; the development of source rock is controlled by sedimentary environment, and high-quality source rock mainly develops in bay environment; the generation intensity of source rock in Wujiaping Formation of Xuanhan-Dazhou-Bazhong-Tongjiang area is strong, and is favorable for large and middle gas fields.

关 键 词：天然气 烃源岩 生烃潜力 生气强度 地球化学 吴家坪组 二叠系 川东北 

分 类 号：P618.130.1[天文地球—矿床学] TE122[天文地球—地质学]