【摘要】 煤成气砂岩储层在孔隙度测井曲线上有明显不同于含水砂岩的反映特征:长源距声波时差值因受冲洗带含气饱和度的影响而大于短源距的声波时差值;在中子—中子孔隙度测井曲线上则为孔隙度幅值降低,这是由于煤成气的密度远小于水而导致含煤成气砂岩含氢指数降低,且随含气饱和度的增加而中子—中子孔隙度减小,上述特征可以有效地判定砂岩中煤成气的存在.作者通过理论和实例分析说明了利用煤田测井探测煤成气砂岩储层的可行性.更多还原

【Abstract】 The intention of this paper is to explore the coal bed methane in sandstone by coal logging. This is a working theory which is based on the idea that porosity log methods of stratum. A case of a drill hole is presented.更多还原