利用纵横波速度判别火成岩气、水层的理论基础及应用  

The Theoretical Principle and Application of Distinguishing Igneous Gas and Water Layers Using vp/vs

作　　者：赵辉 司马立强[2] 戴诗华 王洪亮 董彦喜 

机构地区：[1]中国石油川庆钻探工程公司地质勘探开发研究院,四川成都610051 [2]西南石油大学资源与环境学院,四川成都610500 [3]中国石油西部钻探工程公司测井公司,新疆克拉玛依834000

出　　处：《测井技术》2012年第6期602-606,共5页Well Logging Technology

摘　　要：在研究纵横波速度及其比值(vp/vs)与含水饱和度的关系、纵横波速度比与火成岩岩性和孔隙度关系的基础上,利用vp/vs与横波交会识别火成岩储层的气、水层。实验和理论模拟结果表明横波对气体含量不敏感,纵波对气体含量敏感,含有少量气体时可使纵波速度及其纵横波速度比显著减小,水层的vp/vs显著大于气层。实际测井资料和实验结果表明岩性和孔隙对纵横波速度比都有影响,具体处理时分岩性采用纵横波速度比与横波交会图版。利用(vp/vs)—Δts交会可消除孔隙度和岩性的影响;利用vp/vs能区分气层(气水层)与水层,但不能有效区分气层与气水层,也不能区别油层和水层。Based on study of relationship between longitudinal and shear wave velocity and their ratio and water saturation, the relationship between longitudinal and shear wave velocity ratio and igneous lithology and porosity, the cross plot between the longitudinal and shear wave velocity ratio and shear wave is used to identify gas and water layers. Experimental and theoretical simulation results show that the shear wave velocity is not sensitive to the gas content, but longitudinal wave velocity is sensitive to the gas content, so a small amount of gas may result in significant reduction of longitudinal and shear wave velocity ratio, and the vp/vs of water layer is significantly higher than that of gas. The actual log data and experimental results show that both lithology and pore have an impact on vp/Vs. And so actual fluids identification plots for igneous reservoir should be set up according to different lithologies. The cross plot of different rocks between vp/vs and shear wave can eliminate the impact of porosity and lithology, highlighting the different impact of fluid properties. The vp/vs ratio may identify gas （gas-water） and water layers effectively, but may not identify gas and gas-water layers, even not the oil and water layers.

关 键 词：岩石物理研究 火成岩 纵横波速度比 流体类型 饱和度 岩性 孔隙度 

分 类 号：P631.84[天文地球—地质矿产勘探]