鄂尔多斯盆地南部中生界陆相页岩气地质特征.pdfVIP

294 2014 6 PETROLEUM EXPLORATION AND DEVELOPMENT Vol.41 No.3 文章编号：1000-0747(2014)03-0294-11 DOI: 10.11698/PED.2014.03.04 鄂尔多斯盆地南部中生界陆相页岩气地质特征 王香增，高胜利，高潮 （陕西延长石油（集团）有限责任公司） 基金项目：国家高技术研究发展计划（2013AA064500 ）；国家科技支撑计划项目（2012BAC26B00 ） 摘要：基于鄂尔多斯盆地南部页岩气勘探研究与实践，从盆地陆相页岩分布、页岩气地球化学特征、页岩储集层特 征、页岩气赋存状态等方面，总结鄂尔多斯盆地中生界陆相页岩气的地质特征。鄂尔多斯盆地中生代晚三叠世早、 中期湖盆演化控制页岩气源岩的形成和分布，研究区主力烃源岩为三叠系延长组长7、长9 段页岩层系，其总有机碳 含量较高，处于成熟— 湿气（原油伴生气）阶段。页岩气储集层矿物成分以石英、长石和黏土矿物为主，主要孔隙 类型为原生粒间孔和次生溶蚀孔。研究区陆相页岩气均为偏腐泥型干酪根热演化形成的油型气，以湿气为主，吸附 8 3 态、游离态和溶解态并存。采用容积法估算长 7 段页岩气总资源量为 5 318.27×10 m ，长 9 段页岩气总资源量为 8 3 3 067.29×10 m 。图 17 表 7 参29 关键词：鄂尔多斯盆地；中生界；陆相页岩气；油型气；赋存形式 中图分类号：TE122 文献标识码：A Geological features of Mesozoic continental shale gas in south of Ordos Basin, NW China Wang Xiangzeng, Gao Shengli, Gao Chao (Shaanxi Yanchang Petroleum (Group) Corp. Ltd., Xi’an 710075, China) Abstract: The geological characteristics of Mesozoic continental shale gas are summarized from the following aspects: shale distribution, geochemistry of shale gas, characteristics of shale reservoir, enrichment form of shale gas etc, based on the continental shale gas exploration research and practices in southeast of the Ordos Basin. The geochemical characteristics and thermal evolution degree of shale gas source rocks are controlled by the evolution of lacustrine basin in the early and middle stages of late Triassic Period, and the main hydrocarbon-generation rocks are shale from the Chang 7 and Chang 9 members of the Triassic Yanchang Formation, with high abundance of or