渝东北页岩气下古生界储集特征研究

Study on the characteristics of shale-gas reservoir in lower Paleozoic in the northeast of Chongqing

与常规天然气相比,页岩气开发具有含气面积广、资源量大、开采寿命长和生产时间长的优点。页岩气是一种典型的"自生自储"成藏模式,集烃源岩、储层和盖层等所有关键的成藏体系各要素于同一套页岩层。以渝东北下古生界下寒武统和上奥陶统—下志留统页岩层系为研究对象,从储层物性、裂缝、储层矿物分析和吸附气量几个方面对页岩气的储集特征进行研究,对页岩气的勘探开发具有指导意义。

Compared with the conventional natural gas,the shale - gas development has the advantages of wide gas -bearing area,a huge quantity of resources,long mining life,and long production time. Shale gas is a kind of typical“self gen-eration and self storage”accumulation model,which integrates all critical accumulation elements,such as hydrocarbon source rock,reservoir and cap rock,in the same shale formation. In this paper,the series of the shale - gas strata in the lower Cam-brian and upper Ordovician - lower Silurian in the northeast of Chongqing were taken as research objects. The characteristics of the shale - gas reservoir were studied from the aspects of reservoir physical property,the cracks,reservoir,mineral analysis, and adsorption capacity. The study can provide a guide for the exploration and development of shale gas.