重庆綦江打通区块煤层气地质条件及控气因素研究

Study on CBM Geological Conditions and Gas Control Factors in Datong Block,Qijiang,Chongqing

为揭示打通区块煤层气基本地质特征及主要控气因素,基于区内煤田钻孔、煤层气钻井取得的地质资料、测井资料和实验测试数据,对煤储层煤岩煤质、渗透率、含气性等进行了分析。研究表明:该区块煤层气具有"一多一薄、两高低"特征,即煤层层数多、厚度薄、孔隙度低、渗透率低、变质程度高、含气量高等,具有较好的勘探开发前景;区内煤层气富集主要受沉积、构造作用和水动力条件耦合作用控制。

To reveal CBM basic geological features and main gas control factors in the Datong block, on the basis of geological, well logging and testing data from coal and CBM boreholes in the area, carried out analyses for coal petrology, quality, permeability and gas -bearing property. The study has shown that CBM in the block has features of multi - reservoir, thin single layers, low porosity and permeability, high degree of metamorphism and gas content etc. with better exploration and exploitation prospect. The CBM enrichment in the area is mainly controlled by coupling of sedimentation, tectonization and hydrodynamic conditions.