湘西北龙马溪组页岩储层特征与吸附影响因素分析

通过对湘西北某页岩气区块龙马溪组黑色页岩进行相应的有机地球化学、物性特征及等温吸附实验分析，发现页岩中微孔和中孔发育，孔隙类型以矿物质孔、溶蚀孔以及粒内晶间孔为主，且裂缝较发育，提供了页岩气储集与渗流的有效空间和主要通道。研究区龙马溪组页岩最大吸附气量范围为1.52～3.78 m³/t，并表现出甲烷吸附气含量与有机碳含量及成熟度具有正相关性；且较高含量的黏土矿物更有利于页岩气的吸附，但从成藏与后期开采条件看，一般不宜超过50%。

Analysis on characteristics of Longmaxi Formation reservoir in northwest of Hunan Province and adsorption influence factor

To identify the features and major controlling factors of sales in Longmaxi Formation，Silurian，in northwestern Hunan，shale samples are tested and analyzed for geochemical characters，physical properties and isothermal adsorption. The result indicates that micro-middle porosity developed well inside of the shale. The pore types mainly include mineral hole，corrosion pore and intragranular intercrystalline pore. Structure fractures developed well in Longmaxi Formation，which provides an effective migration space and path for the accumulation and flow of shale gas. The shale maximum adsorption capacity of Longmaxi Formation generally from 1.52 to 3.78 m³/t，while the adsorption volume of methane has a positive correlation with TOC in shale with high TOC content and maturity. And higher content of clay mineral is more advantageous to shale gas adsorption，but from the late accumulation and mining conditions，it commonly should not be more than 50%.