石油实验地质2019，Vol.41Issue(1)：56-67,12.DOI:10.11781/sysydz201901056
中扬子宜昌地区寒武系水井沱组页岩含气性及影响因素
Gas-bearing characteristics and controls of the Cambrian Shuijingtuo Formation in Yichang area, Middle Yangtze region
摘要
Abstract
The Yichang area in the Middle Yangtze region is a new exploration target for shale gas outside the Sichuan Basin. The shale of the Cambrian Shuijingtuo Formation has an enormous gas resource potential in view of gas shows in most wells. Gas contents vary in different wells. We investigated the gas-bearing characteristics and controls of shale in the Cambrian Shuijingtuo Formation in the Yichang area integrating geological and geochemical data. The black rock series of the Shuijingtuo Formation in this area is mainly carbonaceous shale and gray shale, about 50-140 m thick. They have a high organic carbon content and are mainly of typeⅠ, generally thermally over-mature, showing a good hydrocarbon generation potential. The on-site measured gas content is 0.32-5.48 m3/t, and the cumulative thickness of shale with gas content>2 m3/t is 44.05 m, which reflects a good overall gas content of shale in this area. The gas-bearing capacity of the Shuijingtuo Formation shale is affected by various factors such as sedimentary facies, organic carbon content, mineral composition, porosity, extent of fracture and formation pressure. The black carbonaceous shale deposited in the continental shelf facies has higher gas content than the gray calcareous shale of the slope facies, while the limited platform facies has the lowest gas content. The gas content has a positive correlation with the organic carbon and quartz mineral contents, a weak negative correlation with the carbonate mineral content, and a poor correlation with the clay mineral content. Organic carbon content has a more significant control on gas content. Shale porosity and pore distribution variations are important factors leading to the differences in gas content. In addition, shale gas content is also closely related to reservoir fracture development and formation pressure.关键词
含气性/页岩气/水井沱组/寒武系/宜昌地区/中扬子地区Key words
gas-bearing capacity/shale gas/Shuijingtuo Formation/Cambrian/Yichang area/Middle Yangtze region分类
能源科技引用本文复制引用
罗胜元,刘安,李海,陈孝红,张淼..中扬子宜昌地区寒武系水井沱组页岩含气性及影响因素[J].石油实验地质,2019,41(1):56-67,12.基金项目
国家科技重大专项"中扬子高演化页岩气赋存机理与富集规律研究"(2016ZX05034001-002) （2016ZX05034001-002）
中国地质调查局"宜昌斜坡页岩气有利区战略调查"(DD20179615)联合资助 （DD20179615）
