黔北地区与涪陵地区下志留系龙马溪组页岩储层特征研究

Study of Shale features in Lower Silurian Longmaxi Formation in Northern Guizhou and Fulin

本文利用野外露头观测、岩心观察、薄片观察及相关测试分析结果对黔北地区页岩气储层进行研究并与我国页岩气开发成熟的涪陵地区页岩气储层做出比较。结果表明:黔北龙马溪组页岩厚度普遍较大,主要发育于深水陆棚环境。与涪陵页岩气田相比较黔北龙马溪组页岩有机质类型大多处于成熟一过成熟阶段,具有较高TOC含量和高含气量。且龙马溪组页岩沉积环境相对稳定,烃源岩品质好,脆性矿物含量较高,渗透率与孔隙度等储集空间较好。

The shale gas reservoir in Northern Guizhou is studied based on observation on field outcrop,core,and thin section as well as related test and analysis results and compared with the shale gas reservoirs in Fuling area.The results show that:the shale thickness of Longmaxi Formation in Northern Guizhou is larger than other formations due to deep water shelf environment.Compared with Fuling shale gas field,Longmaxi Formation grows to mature-post mature stage,its organic matter type has high TOC and gas content.The sedimentary environment of the formation is relatively stable,which bring out the good quality of the hydrocarbon source rocks,high brittleness mineral content,and high porosity and permeability reservoir space.