高和群 韦重韬 曹佳 潘海洋

(1.中国矿业大学资源与地球科学学院,江苏 221008;2.煤层气资源与成藏过程教育部重点实验室,江苏 221008)

沁水盆地南部含气饱和度特征

高和群1,2韦重韬1,2曹佳1,2潘海洋1,2

(1.中国矿业大学资源与地球科学学院,江苏 221008;2.煤层气资源与成藏过程教育部重点实验室,江苏 221008)

以沁水盆地南部3#煤层和15#煤层为对象,采用类比法、内插法等方法对该区含气饱和度的空间分布规律及其控制因素进行了研究。结果表明,含气饱和度值由东向西、由南向北递增;含气饱和度与煤储层埋深具有良好的负相关性,即含气饱和度随煤层埋深的增加而降低。3#煤层含气饱和度总体上高于15#煤层。通过对含气饱和度影响因素分析,得出含气量和埋深对含气饱和度影响最大,煤厚影响显著。并根据含气饱和度特征,将沁水盆地南部划分为三个区,其中,Ⅰ区为煤层气开发前景最好的区块,Ⅱ区块次之,Ⅲ区块最差。

含气饱和度 储层压力 饱和含气量 实测含气量 沁水盆地南部

Abstract:Spatial distribution regularities of gas saturation and their controlling factors have been studied by geological analogy and interpolation for No.3 and 15 coal seams in the south of Qinshui basin.The results show that the value of gas saturation increases from east to west and south to north;there is a good negative correlation between gas saturation and reservoir depth.And the value of No.3 coal seam is generally higher than that of No.15 coal seam.Through analyzing on controlling factors of gas saturation,the most significant factors are gas content and burial depth;the coal thickness is second.At last,in accordance with gas saturation,3 blocks are divided into the whole south of Qinshui basin.By compared with each other,it has been found that the best block is blockⅠ,the second for blockⅡ,and the worst BlockⅢ.

Keywords:Gas saturation;reservoir pressure;saturated with gas;measured gas content;the south of Qinshui basin

1 引言

含气饱和度是煤层气选区评价与开发的重要参数,更是反映煤层气开发难易程度和煤层气井产能评价的一个重要指标,而沁煤层气田[1-4]。基于此,本文对沁水盆地南部主煤层含气饱和度特征及其控制机理进行研究。

2 理论依据及方法

本文以沁水盆地南部3#煤层和15#煤层为研究对象,收集和整理了117个煤层气井和煤田勘探钻孔资料,其中包括20余个煤层气井和10余个煤层瓦斯测试井,遍布整个研究区。……