吴堡地区煤层气地质条件及利用潜力研究

鄂尔多斯盆地近年来成为国内煤层气勘探开发的焦点区域并且取得了较多成果。吴堡地区位于鄂尔多斯盆地东缘,煤炭资源丰富。通过对吴堡地区煤储层特征、地质构造条件和水文地质条件进行详细剖析,认为该区煤层发育稳定,有效厚度大,埋深适中,Ro为1.14%～1.39%,顶底板封闭性好,构造和水文地质条件相对简单,有利于煤层气的富集成藏和勘探开发。基于对吴堡地区煤层气地质条件的详细研究,利用体积法计算该区煤层气资源量为3.137×109m3和1.086×1010m3,前者为基于煤田钻孔测定的含气量计算结果,后者为引用前人研究中含气量估算数据。由于煤田钻孔测定的含气量值偏低,资源量计算结果中的后者可信度较高,因此该区煤层气开发前景和潜力十分可观。 In recent years,Ordos basin becomes a focus area of coalbed methane exploration,the exploitation has made gerat achievements.Wubu area is located in eastern Ordos basin,which is abundant in coal resources.The analysis of coal seam characteristics,geological structure and hydrogeological conditions of Wubu area show that the coal seam is beneficial for accumulation and exploitation of coalbed methane because of the stable development,large effective thickness,moderate depth,good sealing conditions of coal seam roof and floor,simple structure and hydrogeological conditions.The Ro is between 1.14 percent and 1.39 percent.Based on the detailed study of coalbed methane geological conditions of Wubu area,calculate the resources reserves of coalbed methane are 3.137×109 m3 and 1.086×1010 m3 using volume method.The former is calculated using coalfield drilling method and the latter is calculated using estimate gas content data of previous studies.The gas content data measured by coalfield drilling method is lower than its true value,the latter calculated result is more faithful.Wubu area has broad development prospect