页岩岩相划分及含气性评价
——以滇黔北地区五峰组—龙马溪组为例

Shale lithofacies classification and evaluation of gas?鄄bearing property: a case study of the Wufeng?鄄Longmaxi Formation in northern Yunnan and Guizhou

李明隆,谭秀成,李延钧,邹辰,张朝,王高翔

天然气地质四川省重点实验室，四川 成都 610500 中国石油天然气集团有限公司碳酸盐岩储层重点实验室西南石油大学研究分室，四川 成都 610500 西南石油大学地球科学与技术学院，四川 成都 610500 成都创源油气技术开发有限公司，四川 成都 610500 中国石油浙江油田分公司，浙江 杭州 310013 中国石油西南油气田分公司页岩气研究院，四川 成都 610500

针对滇黔北地区页岩岩相划分及含气性评价的研究较少，文中基于岩心分析化验资料，开展该地区五峰组—龙马溪组海相页岩岩相研究。结果表明：滇黔北地区五峰组—龙马溪组岩相划分为富碳硅质页岩、贫碳硅质页岩、富碳钙质页岩、贫碳钙质页岩、贫碳黏土质页岩、富碳钙质硅质页岩、富碳黏土质硅质页岩、贫碳黏土质硅质页岩及富碳黏土质钙质页岩等9种岩相，其中富碳钙质硅质页岩、富碳硅质页岩、富碳钙质页岩岩相为研究区优质岩相；通过低温氮气吸附实验、页岩气现场解析试验和甲烷等温吸附实验，分析了9种页岩岩相的孔隙结构特征和含气性。研究结果可为页岩气富集区预测提供岩相学支撑，有利于滇黔北地区海相页岩气的下步勘探。

There are few studies about shale lithofacies classification and gas-bearing property in northern Yunnan and Guizhou now. Based on core analysis in this paper, marine shale lithofacies of Wufeng-Longmaxi Formation in northern Yunnan and Guizhou are studied. The research results show that 9 kinds of lithofacies such as carbon-rich siliceous shale, carbon-lean siliceous shale, carbon-rich calcareous shale, carbon-lean calcareous shale, carbon-lean clayey shale, carbon-rich calcareous siliceous shale, carbon-rich clayey siliceous shale, carbon-lean clayey siliceous shale and carbon-rich clayey calcareous shale are found in the Wufeng-Longmaxi Formation of northern Yunnan and Guizhou. The carbon-rich calcareous siliceous shale, carbon-rich siliceous shale, carbon-rich calcareous shale have the better gas-bearing property, which are the high-quality shale facies in the study area. Throuth the experiment of low-temperature N2 adsorption, field shale gas content analysis and isothermal methane adsorption， the pore structure characteristics and gas-bearing properties of 9 kinds of shale lithofacies are analyzed. The research results not only provide lithographic support for shale gas distribution prediction, but also facilitate the further exploration of marine shale gas in northern Yunnan and Guizhou.

10.6056/dkyqt202106002