重庆地区二叠系龙潭组煤系地层非常规气地质特征分析

Analysis of unconventional gas geological characteristics of Permian SystemLongtan Formation coal measure strata in Chongqing area

为探索重庆地区二叠系龙潭组煤系地层非常规气地质特征,基于区内煤田勘查、煤层(系)气勘查取得的地质资料及测试数据,对二叠系龙潭组煤系地层煤储层、暗色泥页岩储层、致密砂岩储层基本特征进行分析总结。研究表明,区内煤储层具有煤体结构以碎裂—块状为主、埋深中等、孔隙不发育、低孔低渗、含气量高的特点;暗色泥页岩储层具有低脆性、单层厚度薄、孔隙不发育、低孔低渗、含气量一般的特点;致密砂岩储层具有单层厚度薄、孔隙不发育、低孔低渗、含气性一般的特点。若考虑组合开发,具备一定的开发前景。

In order to explore the unconventional gas geological characteristics of Permian System Longtan Formation coal measure strata in Chongqing area,based on geological data and test data obtained from coal field exploration and coal seam(series)gas exploration in the area,the basic characteristics of Permian System Longtan Formation coal measure strata coal reservoirs,dark shale reservoirs,and dense sandstone reservoirs were analyzed and summarized.Research has shown that the coal reservoirs in the area have characteristics of coal body structure mainly consisting of fragmented to blocky structures,moderate burial depth,undeveloped pores,low porosity and low permeability,and high gas content.Dark shale reservoirs have the characteristics of low brittleness,thin single-layer thickness,undeveloped pores,low porosity and permeability,and average gas content.The tight sandstone reservoir has a thin single-layer thickness,undeveloped pores,low porosity and permeability,and general gas bearing properties.If combined development is considered,it has certain development prospects.