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作 者:客昆 秦建华 牟必鑫 魏洪刚[1] 何伟[1] 雷玉雪 陈杨[1] 刘治成 Qie Kun;Qin Jianhua;Mou Bixin;Wei Honggang;He Wei;Lei Yuxue;Chen Yang;Liu Zhicheng(Sichuan Coal Geological Engineering Design and Research Institue,Chengdu 610072,Sichuan,China;Institule of Mulipurpose Uilization of Mineral Resources,CAGS,Chengdu 610041,Sichuan,China;Sichuan Institule of Land Science and Technology,Chengdu 610045,Sichuan,China)
机构地区:[1]四川省煤田地质工程勘察设计研究院,四川成都610072 [2]中国地质科学院成都矿产综合利用研究所,四川成都610041 [3]四川省国土科学技术研究院,四川成都610045
出 处:《沉积与特提斯地质》2020年第3期140-150,共11页Sedimentary Geology and Tethyan Geology
摘 要:海陆过渡相富有机质泥页岩是页岩气勘查开发的重要领域。本文以西昌盆地上三叠统白果湾组富有机质泥页岩为研究对象,对研究区内富有机质泥页岩的沉积岩相古地理特征、微观孔隙类型、孔隙结构特征进行研究。白果湾组富有机质泥页岩段沉积相主要为湖泊相、三角洲相、河流相。发育不同类型的微孔隙,孔隙主要以小孔为主,微孔次之,平均孔径分布在5.56-56.89nm之间,比表面积平均为9.44m^2/g,总孔体积平均为0.0187cm^3/g。页岩气主要形成于滨浅湖亚相及半深湖亚相中,并主要吸附于富有机质泥页岩的小孔、微孔内;西昌盆地白果湾组富有机质泥页岩储集空间较好,具有良好的勘探潜力。Organic-rich mud shale in transitional facies is an important target for shale gas exploration.In this paper, the paleogeographic features, micro-pore types and pore structures of the organic-rich mud shale of the Upper Triassic Baiguowan Formation in Xichang Basin were studied.Lake facies and delta facies are the main sedimentary facies of organic-rich mud shale in the Baiguowan Formation. Small pores, which are dominant, followed by micropores, occurred in the organic-rich mud shale in the Baiguowan Formation. The average pore size was between 5.56 nm and 56.89 nm, the average specific surface area was 9.44 m^2/g, and the average total pore volume was 0.0187 cm^3/g. Shale gas was mainly formed in shore-shallow lake subfacies and semi-deep lake subfacies, and mainly adsorbed in the small pores and micropores of the organic-rich mud shale. In general, the organic-rich mud shale of the Baiguowan Formation in Xichang basin is potential for exploration of shale gas.
关 键 词:西昌盆地 白果湾组 富有机质泥页岩 沉积特征 孔隙特征
分 类 号:P534.51[天文地球—古生物学与地层学] TE122[天文地球—地质学]
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