AVO approximation for PS-wave and its application in PP/PS joint inversion  

转换波AVO近似及其在PP/PS联合反演中的应用(英文)

作　　者：王璞[1] 胡天跃[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《Applied Geophysics》2011年第3期189-196,240,共9页应用地球物理（英文版）

基　　金：supported by the Natural Science Foundation of China (Grant Nos 40974066 and 40821062);the National Basic Research Program of China (Grant No. 2007CB209602)

摘　　要：Multi-component exploration has many advantages over ordinary P-wave exploration. PP/PS joint AVO analysis and inversion are useful and powerful methods to discriminate between reservoir and non-productive lithology. In this paper, we derive a new PS-wave reflection coefficient approximation equation which is more accurate at larger incidence angles. The equation is simplified for small incidence angles, which makes AVO analysis clearer and easier for angles less than 30 degrees. Based on this approximation, a PP/PS joint inversion is introduced. A real data example shows that oil sands, brine sands and shales can be differentiated based on the P- to S-wave velocity ratio from the PP/PS joint inversion. Fluid factors and Poisson＇s ratio also indicate an anomaly in the target zone at the oil well location.多分量勘探相比常规纵波勘探而言有许多的优势,PP/PS联合AVO分析和反演是强而有效的储层识别方法。在本文中,我们推导了更精确的转换波AVO反射系数公式;并在入射角小于30度时进行了进一步简化,其对于转换波AVO分析和反演而言更加简单有效。基于该近似,我们进行了PP/PS联合AVO反演。实际资料的实例表明,反演得到的纵横波速度比可很好地识别岩性及油气。反演得到的流体因子和泊松比等其他属性在储层处也显示出明显异常,效果显著。

关 键 词：PS wave AVO reflection coefficient joint inversion MULTI-COMPONENT 

分 类 号：P631.4[天文地球—地质矿产勘探]