河东煤田谭坪勘查区煤层气成藏地质特征

Geological Characteristics of Coalbed Methane Reservoir Formation in Tanping Exploration Area of Hedong Coalfield

研究区位于鄂尔多斯含煤盆地东缘河东煤田南段,是稳定的克拉通内的大型含煤盆地。通过分析研究以往地质成果资料,从地质构造特征、沉积环境、煤层分布、储层特征、含气性、烃源岩因素、封盖层条件、水文地质条件等方面分析了研究区煤层气成藏地质特征。研究结果显示,研究区地质构造简单,储层分布稳定,埋深适中,含气饱和度较低,盖层封闭条件好,具有良好的煤层气勘探开发前景,煤层弱径流区和含气量较高地区是该区煤层气勘查的主要目标区。

The research area is located in the southern section of Hedong coalfield on the eastern margin of Ordos coal-bearing basin,which is located in the western part of Sino-Korean continental plate and is a large coal-bearing basin within the stable craton.The geological characteristics of CBM reservoir formation in the study area are analyzed from the aspects of geological structure characteristics,sedimentary environment,coal seam distribution,reservoir characteristics,gas bearing properties,source rock factors,cap bed conditions and hydrogeological conditions.The research results show that the study area has simple geological structure,stable reservoir distribution,moderate burial depth,low gas saturation,good sealing conditions,and good prospects for coal seam gas exploration and development.The weak runoff area of coal seam and the area with high gas content are the main target areas for coal seam gas exploration in the study area.