论文部分内容阅读
页岩气具有自生自储、低孔低渗的特点,它的成藏机理与常规气藏相似,对产量贡献最大的是游离气。高产页岩气藏需要具备以下四个基本条件:具有持续生气能力的页岩,网状微裂缝发育,气藏发育在构造封闭的宽缓背斜中顶底板岩层致密,形成岩性圈闭。盆地内构造运动影响较小、成藏诸要素具备,是国内重点页岩气勘探区域,尤其是四川盆地下志留统龙马溪组及下寒武统牛蹄塘组黑色页岩,应作为我国页岩气勘探的重点目标。
Shale gas has the characteristics of self-generation and self-storage, low porosity and low permeability. Its accumulation mechanism is similar to that of conventional gas reservoirs, and the largest contributor to the production is free gas. Productive shale gas reservoirs need to have the following four basic conditions: Shale with sustained gas generation, network microcracks development, gas reservoirs developed in the structure of the broad and gentle anticline middle and top floor rock formation tight, the formation of lithological traps. The tectonic movement in the basin is less affected by the accumulation of various elements and is the key shale gas exploration area in China. In particular, the Lower Shaliu Longmaxi Formation and the Lower Cambrian Niutitang Formation black shale in the Sichuan Basin should be regarded as our country Shale gas exploration of the key objectives.