鄂尔多斯盆地神府地区上古生界山西组烃源岩地球化学特征  

Geochemical characteristics of source rocks of the Upper Palaeozoic Shanxi Formation source rocks in Shenfu Area,Ordos Basin

作　　者：郝烃 杜佳 孔令强 Hao Ting;Du Jia;Kong Lingqiang(CNOOC Beijing New Energy Branch,Beijing 102200,China;China United Coalbed Methane Co.Ltd.,Beijing 100020,China)

机构地区：[1]中海石油(中国)有限公司北京新能源分公司,北京102200 [2]中联煤层气有限责任公司,北京100020

出　　处：《地质学刊》2024年第3期247-254,共8页Journal of Geology

基　　金：中海石油(中国)有限公司重大科技专项“中联公司上产60亿方关键技术研究”(CNOOC-KL 135 ZDXM 40)。

摘　　要：通过分析鄂尔多斯盆地神府区块山西组泥岩、煤样品的地球化学数据,对目标层的烃源岩分岩性进行有机质类型、有机质特征及有机质成熟度的探讨,并与邻区同层位烃源岩地球化学特征进行对比,总结研究区目标层烃源岩的地球化学特征。结果表明,神府区块山西组泥岩为中—差等级的烃源岩,炭质泥岩和煤烃源岩的整体有机碳质量分数(w_(TOC))高于泥质烃源岩,属好—很好烃源岩,为主力生烃烃源岩。其中,泥岩烃源岩的有机质类型以Ⅲ型为主,煤和炭质泥岩烃源岩的有机质类型以Ⅱ型为主,指示其原始沉积物主要为高等植物,因此成烃以气为主、生油为辅。山西组烃源岩大部分已达成熟阶段,少部分为低成熟阶段,且自西向南有机质成熟度逐渐变高。Based on the analysis of the geochemical data of mudstone and coal samples of Shanxi Formation in Shenfu Block,Ordos Basin,the types,characteristics and maturity of organic matter of source rocks in the target layer are discussed,and the geochemical characteristics of source rocks in the target layer are compared with those in the adjacent area.The results show that mudstone of the Shanxi Formation in Shenfu Block can be evaluated as a medium-poor source rock.The TOC content of carbonaceous mudstone and coal source rock is higher than that of argillaceous source rock,which can be evaluated as a good-very good source rock and the main source rock of hydrocarbon generation.The organic matter type of mudstone source rocks is mainly typeⅢ,and that of coal and carbonaceous mudstone source rocks is mainly typeⅡ,indicating that the original sediments are mainly higher plants,so hydrocarbon generation is mainly gas,supplemented by oil generation.Most of the source rocks in Shanxi Formation have reached the mature stage,and only a few are at the low mature stage,and the maturity of organic matter gradually increases from west to south.

关 键 词：山西组 烃源岩 有机质类型 有机质成熟度 神府区块 鄂尔多斯盆地 

分 类 号：P534.4[天文地球—古生物学与地层学]