湖南石门地区下寒武统牛蹄塘组页岩气储层特征及储集条件分析  

Lower Cambrian Niutitang Formation Shale Gas Reservoir Features and Reserve Condition Analysis in Shimen Area,Hunan

作　　者：康如华 冯经平[1] 刘成鑫 许云舟 罗刚[1] 李福顺[1] 龙长聪 龙安[1] Kang Ruhua;Feng Jingping;Liu Chengxin;Xu Yunzhou;Luo Gang;Li Fushun;Long Changcong;Long An(No.418 Exploration Team,Hunan Province Geology and Mineral Resources Exploration and Exploitation Bureau,Loudi,Hunan 417000;Shenergy Co.Ltd.,Shanghai 201103)

机构地区：[1]湖南省地质矿产勘查开发局四一八队,湖南娄底417000 [2]申能股份有限公司,上海201103

出　　处：《中国煤炭地质》2018年第9期23-28,共6页Coal Geology of China

基　　金：中国地质调查局页岩气资源潜力评价项目(项目编号1212011220802)

摘　　要：主要从岩性组合特征、岩石学特征、孔渗特征、比表面积、储集空间及其吸附性能等方面系统分析了湖南石门地区下寒武统牛蹄塘组页岩气储层特征及储集条件。该地区牛蹄塘组页岩脆性矿物质量分数为40. 8%~79. 6%,平均60. 15%,脆性矿物含量丰富;脆性指数分布在0. 41~0. 82,平均0. 61,脆性指数高。页岩有效孔隙度为0. 69%~16. 07%,平均10. 16%,孔隙度中等偏高,且差异较大;渗透率为0. 27×10-6~5. 7×10-6μm2,平均0. 92×10-6μm2(0. 000 92mD),渗透率相对较低。页岩中发育基质晶间孔、粒间孔、溶蚀孔以及有机质纳米孔等,且页岩原生孔隙系统的渗透率相当低,但原生孔隙内表面积大,拥有较多潜在的吸附空间。等温吸附试验结果表明,石门地区下寒武统牛蹄塘组黑色页岩的吸附含气量范围为0~6. 504 8cm3/g,含气量推测值0. 06~3. 32m3/t,具有较好的吸附气性能,具备较好的页岩气资源前景。From aspects of lithological assemblage features, petrological features, poroperm characteristics, specific surface area, reserve space and adsorptive capacity etc. have analyzed lower Cambrian Niutitang Formation shale gas reservoir features and reserve condition. The abundant brittle mineral content in the Niutitang Formation shale in the area is 40. 8% -79. 6%, average 60. 15% ; with high brittleness index 0. 41 - 0. 82, average 0. 61. The active porosity of shale is 0. 69% - 16. 07% , average 10. 16% , thus medium on the high side with large difference; permeability 0. 27 × 10 -6 -5.7 × 10 -6 μm2, average 0. 92 × 10 -6 μm2 （0. 000 92 mD） , thus relatively low. Matrix intercrystalline pores, intergranular pores, dissolved pores and organic nanopores have been developed in shale. Permeability of shale primary pore system is rather low, but large inner surface area of primary pore has more potential of adsorption space. The result of isothermal adsorption test has shown that the Shimen area lower Cambrian Niutitang Formation black shale adsorption gas content range is 0 - 6. 504 8cm3/g, tentative gas content is 0. 06 - 3.32m3/t with better gas adsorptive capacity, thus has better shale gas resource prospect.

关 键 词：湖南石门地区 下寒武统 牛蹄塘组 页岩气 储集条件 

分 类 号：TE122[石油与天然气工程—油气勘探]