声波参数识别含气砂岩地层实验研究  

Experiments on Identification of Gas in Sandstone Formation with Acoustic Parameters.

作　　者：张银海[1] 胡学红[1] 李长文[1] 

机构地区：[1]江汉测井研究所

出　　处：《测井技术》2000年第3期194-197,共4页Well Logging Technology

摘　　要：在实验室常温常压条件下 ,对砂岩样品声波参数随含水饱和度的变化关系进行了实验研究 ;并根据Gassmann公式对岩样的声波参数进行了计算 ;从中得出声波参数与含水饱和度、孔隙度的关系。将理论与实验对比 ,分析了存在差异的原因。结果表明 ,当砂岩含少量气体时 ,声波参数发生明显变化 ;纵横波速度比和压缩系数均与孔隙度有密切关系 ,并可用于识别气层。Experimental relations between acoustic parameters of sandstone samples and water saturation are studied under ordinary temperature and pressure in laboratory. The acoustic parameters of the sandstone samples are calculated in terms of Gassmann′s formula, from which we obtain the relation between the acoustic parameters and water saturation, and also the relation between the acoustic parameters and porosity. These experimental relations are compared with the theoretical relations based on the Gassmann′s formula. Reasons caused the difference between experiments and theory are analyzed. The experimental results show that the acoustic parameters are changed sharply when the sandstone contains very small amount of gas. The ratio of the P wave to the S wave velocities and the compressional modulus are both related closely with porosity, and can be used in identification of gas in sandstone formation.

关 键 词：参数识别 饱和度 孔隙度 含气砂岩 声波测井 

分 类 号：P631.814[天文地球—地质矿产勘探] TE311[天文地球—地质学]