陕西省东南部下寒武统页岩气资源潜力分析  

Lower Cambrian Shale Gas Resources Potential Analysis in Southeastern Shaanxi Province

作　　者：赵雪娇[1,2] 吴彦君[3,4] 杨甫[1,5] 田涛[1,5] Zhao Xuejiao Wu Yanjun Yang Fu Tian Tao(Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi＇ an, Shaanxi 710016 Shaanxi Provincial Coal Geological Exploration Research Institute Co. Ltd., Xi＇an, Shaanxi 710016 Northwest University, Xi＇an, Shaanxi 710069 Qinghuabian Oil Production Plant, Yanchang Oilfield Co. Ltd., Yan＇an, Shaanxi 716003 Shaanxi Coal Geology Group Co. Ltd., Xi＇an Shaanxi 710021)

机构地区：[1]国土资源部煤炭资源勘查与综合利用重点实验室,西安710016 [2]陕西煤田地质勘查研究院有限公司,西安710016 [3]西北大学,西安710069 [4]延长油田股份有限公司青化砭采油厂,陕西延安716003 [5]陕西省煤田地质有限公司,西安710016

出　　处：《中国煤炭地质》2017年第2期29-34,64,共7页Coal Geology of China

基　　金：国土资源部煤炭勘查与综合利用重点实验室自主科研项目(编号ZP2013-2)

摘　　要：陕西省东南部下寒武统黑色页岩发育,厚度较大,目前对该地区页岩的相关研究极少。通过烃源岩分析、薄片鉴定、扫描电镜分析、X线衍射、液氮吸附等实验方法,对页岩的有机地球化学特征、矿物组成、孔隙结构特征等储层物性参数及页岩气勘探开发潜力进行了分析。结果表明,该套黑色页岩有机质类型以Ⅰ型干酪根为主,总有机碳(TOC)平均为2.24%。烃源岩有机质成熟度平均为2.07%,处于高或过成熟阶段,有利于页岩气的生成及吸附。页岩储层发育溶蚀孔隙、黏土矿物微孔隙和微裂缝。从矿物组成看,脆性矿物含量较高,利于后期压裂改造。从孔隙结构看,孔隙具有较大的比表面积,平均值为2.75 m^2/g,以中孔为主。综上所述,虽然研究区构造复杂,但有机地化特征、矿物组成、孔隙发育及孔隙结构特征等均表明下寒武统黑色页岩具有一定的页岩气资源潜力。In the southeastern Shaanxi Province has developed rather thick lower Cambrian black shale, but very few relevant stratigraphic researches on the shale in the area. Through source rock analysis, thin section identification, SEM analysis, X-ray diffraction and liquid nitrogen adsorption etc. carried out studies on reservoir physical parameters of black shale geochemical features, mineral composition; pore structural features etc. Then analyzed study area shale gas exploration and exploitation potential. The result has shown that the black shale organic matter type is mainly kerogen type I, average TOC 2.24%. Average organic matter maturity of source rock is 2.07%, at high or over mature stage, propitious to shale gas generation and adsorption. In shale reservoir has developed dissolved pores, clay mineral micropores and microfissures. See from mineral composition, brittle mineral content is rather high, propitious to succeeding fracturing. See from pore structure, pores have rather large specific surface area, average 2.75m2/g, mainly medium pores. In summary, although structures in study area are complex, but organic geochemical features, mineral composition, pore development and pore structures are all indicated the lower Cambrian black shale has certain shale gas resource potential.

关 键 词：陕西省 下寒武统 页岩气 储层特征 

分 类 号：TE112[石油与天然气工程—油气勘探]