贵州六枝特区郎岱区块煤层气开发潜力评价

CBM Exploitation Potential Assessment for Langdai Block,Luzhi Special Zone,Guizhou

郎岱向斜上分布有黑拉嘎井田、归宗井田、郎岱井田、上纳井田、苦竹林井田,通过对各井田煤层的最新钻井、露头地质调查资料及样品分析结果进行研究,对煤层厚度、含气量、渗透性、煤体结构、吸附性、构造条件、水文条件、地应力等参数进行系统分析,采用体积法估算郎岱向斜煤层气资源量,初步评价煤层气可采性和资源潜力。结果表明:郎岱区块煤层气资源量较大、资源丰度较高,含气量较高、煤层渗透较高,地应力低,但由于各煤层的煤体主要为糜棱煤,对地面煤层气开发增加了难度。

There are Heilaga, Guizong, Langdai, Shangna and Kuzhulin minefields distributed in the Langdai syncline. Through analytical study of minefields coal seam new boreholes, outcrop geological investigation data and sample tested results, carried out systematic analysis on parameters of coal thickness, gas content, permeability, coal mass structure, adsorptivity, structural condition, hydrogeological condition and ground stress. Through volumetric method estimated CBM resources in Langdai syncline, initially assessed CBM exploitability and resource potential. The result has shown that the CBM resources in Langdai block are rather large, with high resource abundance, higher gas content, better coal permeability and low ground stress, but because of coal mass is mainly mylonitized coal, thus caused certain difficulty in surface CBM exploitation.