福建二叠系中统文笔山组页岩气储层条件分析

为丰富福建省页岩气资源调查评价的基础研究工作，以有机地球化学、岩石矿物成分和储层物性分析等实验为重点，结合野外地质调查、露头及钻井等资料，分析研究了福建省二叠系中统文笔山组页岩气储层地质条件。结果表明：福建二叠系中统文笔山组泥页岩干酪根为Ⅲ型；有机碳质量分数普遍在1%~2%，有机质丰度中等；R_ran值介于3.76%~4.91%，泥页岩处于过成熟演化阶段；岩石脆性矿物普遍较低；泥页岩孔隙度中等，渗透率极低，微孔和中孔提供了气体吸附的主要场所。与国内外典型含气泥页岩相比，福建文笔山组具有形成页岩气的物质基础和埋藏条件，初步认为福建省中部龙岩一带可以作为下一步工作的重点区域。后期需要加强有机质成熟度和微观孔隙结构对储气性能的研究，了解研究区内泥页岩的吸附能力、孔隙形态及发育特征，为福建地区页岩气勘探开发提供指导作用。

Analysis of reservoir conditions of shale gas in Middle Permian Wenbishan Formation in Fujian Province

This study is performed on the geological conditions of shale gas in Middle Permian Wenbishan Formation in Fujian Province. It is based on organic geochemistry, rock minerals and reservoir physical property after geology survey and drilling. The results indicate that kerogen is Ⅲ-type, organic carbon is usually between 1% to 2%, R_ran is between 3.76% to 4.91% in the shale of Wenbishan Formation, and the shale is in the mature stage. The content of brittle minerals is generally low. The shale has medium porosity and extremely low permeability, the micro and meso-pores constitute the major space for gas adsorption. In comparison with other typical studies, Wenbishan Formation in Fujian Province has material basis and buried condition for forming shale gas. It is preliminarily believed that Longyan in the central part of Fujian Province can be used as a key region for further work. In the next study, the effect of organic matter maturity and micro-pore structure on gas storage performance, and adsorption capacity, pore morphology as well as development characteristics of the shale should be enhanced, all of them could direct the exploration and development of shale gas in Fujian Province.