贵州省织纳煤田比德向斜煤储层物性特征及煤层气资源前景

Physical Characteristics of the Coal Reservoirs and Foreground of CBM Resource of Bide Syncline in Zhina Coalfield of Guizhou Province

依据煤田地质钻孔、煤层气参数井获取的详实资料,通过对煤层及煤层气地质信息的有效提取,对比德向斜煤储层渗透性进行了研究,并对煤层气资源进行了估算和预测。区内主要为中-薄、中灰、低挥发份、相对富氢煤;主要煤层6号煤煤体结构较大程度地受到构造破坏,其余煤层原生结构较完整;裂隙较发育,孔隙度较大;煤层试井渗透率较高为中渗透率煤储层。向斜内煤层气总资源量为323.63亿m3,埋深1000m以浅资源量为306.46亿m3,大于15m3/t含气带资源量为243.85亿m3;区内煤层气可采资源量为130.58亿m3。目前化乐勘探区可作为优选靶区。

Based on data from drilling boreholes in the coalfield and coalbed methane （ CBM） parameter wells,combined with effective geological information of coal seam and CBM,the permeability of coal reservoirs in Bide syncline is studied,and CBM resource is also estimated and forecasted. In this area,the coal in the coal seams are mainly with thin and medium thickness,middle ash,low volatile,relative rich in hodrogen. The coal structure in NO. 6 coal seam,which is the main coal seam,is destructed,while primary structure in other coal seam is relatively integral. The fractures in these coal seams are well developed fractures with good porosity. The permeability gained from well tests is relatively high,and these seams can be seen as coal reservoirs with midium permeability. The total amount of CBM resource in the syncline is 323. 63 × 108 m3 ,and 306. 46 ×108 m3 is buried within the depth of 1000m. About 243. 85 × 108m3 of CBM resoureces is estimated in the zone with the gas content of more than 15m3 / t. The amount of recoverable CBM resources in this area reaches 130. 58 × 108 m3 . Huale exploration area could be a precedence target for CBM development at present.