滇东雨旺区块多煤层叠置地质特征及有利区优选

Geological Characteristics of Multilayer Superimposed Coal Seams and Selection of Favorable Area in Yuwang Block of Eastern Yunnan Area

通过滇东雨旺研究区块内煤田钻孔、煤层气井综合测试成果数据资料,对研究区多套煤层叠置发育的地质特征进行了分析和重新认识,结果表明:雨旺区块四套主力煤层C7+8、C9、C13、C19,主力煤层分布面积广,间距平均在3-10m之间。煤质成分较好,含气性自北向南逐渐降低。根据埋深、煤层厚度、累加煤厚、含气量、含气饱和度参数建立选取评价标准,优选出区块内煤层气有利区。Ⅰ位于雨旺区块中部,主要沿B401背斜轴线分布,建议在Ⅰ类有利区内开展多煤层合采工程试验。

Testing results and data of borehole drilling and CBM wells in Yuwang Block in Eastern Yunnan are used to investigate the geological characteristics of multiple superimposed coal seams in the study area.The results show that there are the four main coal seams C7+8,C9,C13,and C19 in Yuwang Block,and the average thickness exceeds 2m.The main coal seams are distributed in a wide area with the average spacing of 3~10m.The coal quality is good,and the gas content of coal seams varies widely,which gradually decreases from north to south,According to the parameters of buried depth,coal seam thickness,cumulative coal thickness,gas content and gas saturation,the standard for area selection and evaluation are formulated and the favorable areas for CBM development are outlined.It is concluded that the grade Ⅰarea is located in the middle of Yuwang Block,mainly distributed along the axis of B401 Anticline.It is suggested to carry out the engineering tests of multi-layer drainage for coalbed methane in the grade Ⅰarea.