由VSP反射波旅行时重建各向异性层速度结构(英文)  

Inversion for Elliptical Anisotropy Velocity with VSP Reflecting Data

作　　者：陈竞一[1] 张中杰[1] 滕吉文[1] 王光杰[1] 韩立国 吴燕冈 

机构地区：[1]中国科学院地质与地球物理研究所 [2]长春科技大学地球物理系

出　　处：《CT理论与应用研究（中英文）》2000年第z1期75-80,共6页Computerized Tomography Theory and Applications

摘　　要：本文提出一种利用有偏ＶＳＰ资料反射波旅行时信息重建椭圆各向异性介质中水平向与垂直向速度的方法。其中，地下介质假定为层状椭圆各向异性介质。反射波旅行时间采用射线追踪理论及几何关系计算得到，反演中的线性方程组采用奇异值分解（ＳＶＤ） 技术进行求解。 方法检测时，我们对各向同性介质及椭圆各向异性介质情况下有限差分法正演模拟的深井有偏移距ＶＳＰ地震资料分别进行各向阿胜和各向异性方法反演成像。结果表明，本文所述方法较之各向同性介质模型反演方法对介质类型有很好的适用性，同时也说明了本方法的可行性。最后，我们分别介绍了对实际有偏ＶＳＰ资料反演得到的地下介质的速度结构图像。In this paper, we present an approach that reconstruct horizontal and vertical velocity in the ellipse anisotropic media by using the information of reflection wave traveltime from the offset VSP data. In this method, the observed media is supposed to stratified ellipse anisotropic, the reflecting traveltime is calculated according to classical ray tracing theory and geometry relations, and the linear equation set in inversion sisolved by SVD technology. The method is tested by using the offset VSP data which are used to simulate the case ofsuper-deep borehole by means offinite-difference method in isotropic media and ellipse anisotropic media. The reconstruct result shows that the method from here has good applicability than the inversion scheme in isotropic media, at the same time, it also note the feasibility ofthis approach Finally, we present velocity image result for the real offset data in isotropic media and ellipse anisotropic media, respectively.

关 键 词：垂直地震剖面 反射波 旅行时 椭圆各向异性介质 层速度 

分 类 号：P631.3[天文地球—地质矿产勘探]