华北安鹤煤田煤储层特征与煤层气有利区分布

通过对安鹤煤田采集煤样的煤质、显微组分、煤相、显微裂隙分析,等温吸附、低温氮比表面及孔隙结构和压汞孔隙结构测试,研究了该区煤层气赋存的地质条件、煤层气生气地质特征和煤储层物性特征。并采用基于G IS的多层次模糊数学评价方法计算了该区的煤层气资源量,预测了煤层气有利区分布。研究结果表明,该区煤层气总资源量为1 115.73×108m3,煤层气资源丰度平均为1.18×108m3/km2,具有很好的煤层气资源开发潜力。在煤田中部的四矿到八矿之间的地区以及北部的水冶镇附近地区,煤层累计有效厚度大、煤层气资源丰度高、煤层埋深适中、煤储层孔裂隙系统发育、渗透性高,是该区煤层气勘探开发的最有利目标区。

Coal Reservoir Characteristics and Perspective and Target Areas for CBM in the Anyang-Hebi Coalfield, North China

Based on the coal quality,maceral,coal facies,micro-fracture,liquid nitrogen isotherm adsorption/desorption and mercury-injection analyses,the occurrence conditions and generation geological characteristics of coalbed methane(CBM),coal reservoir physical characteristics,CBM resource and it's exploration and exploitation prospect in the Anyang-Hebi coalfield have been systematically studied.The in-place CBM resource was calculated using the fuzzy mathematics and stacking analysis of GIS(geographic information system) method.The results show that the in-place CBM resources and the resource abundance in the Anyang-Hebi coalfield are about 1,115.73×108 m3 and 1.18×108 m3/km2 respectively,which are very favorable for CBM exploration and development.The optimum target areas in this coalfield are located in the No.4 mine to No.8 mine districts of middle coalfield and around Shuiyezhen town in the northern coalfield,where the coal reservoirs have a huge coal thickness and a high CBM resource abundance,a good burial depth,well-connected pore-fracture systems,and a high permeability resulting from the local tectonic stress.