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中上扬子区下寒武统牛蹄塘组是我国页岩气最具勘探潜力的目的层位之一。恩施—利川地区的牛蹄塘组是页岩气主要富集区,该地区经历了多期次多旋回构造叠加作用,研究区内下古生界海相页岩受构造变形、断裂、剥蚀等强烈改造作用影响引起区域性能量场变化,致使页岩气吸附/解吸、渗流/扩散等成藏条件发生变化,从而导致研究区内下古生界页岩气保存产生重大调整。以恩施—利川地区下古生界下寒武统牛蹄塘组页岩层系为研究对象,从物质基础、构造作用和演化历史等几个方面对页岩气保存条件进行研究,并综合分析各项指数,提出页岩气保存条件综合评价指数体系,以期对研究区勘探提供进一步的参考资料。
The Lower Cambrian Niutitang Formation in the Upper Yangtze region is one of the most important exploration layers of shale gas in China. The Niutitang Formation in Enshi-Lichuan area is the main enrichment area for shale gas. The area underwent multi-cycle and multi-cycle tectonic superimposition. The marine shales in the Lower Paleozoic in the study area were affected by tectonic deformation, fracture and erosion The strong remodeling effect caused the change of regional energy field, resulting in the change of reservoir conditions such as adsorption / desorption, seepage / diffusion of shale gas, resulting in significant adjustment of the shale gas storage in the Lower Paleozoic in the study area. Taking the Lower Cambrian Niutitang Formation shale strata of Lower Paleozoic in Enshi-Lichuan area as the research object, the shale gas storage conditions are studied from the aspects of material foundation, tectonic function and evolution history, Term index, put forward a comprehensive evaluation index system of shale gas preservation conditions in order to provide further reference materials for exploration in the study area.