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张世俊 ,杨慧珠 ,董渊 ,杜启振 .遗传算法反演 HTI介质各向异性参数 .石油地球物理勘探 ,2 0 0 2 ,37(1) :2 4～2 8具有水平对称轴的横向各向同性 (HTI)介质是用来描述含有平行垂直裂隙的裂缝性油气藏的最简单方位各向异性模型。本文针对任意各向异性程度的 HTI介质水平反射界面 ,根据任意方位角 (测线方向与主轴方向的夹角 )转换波动校正速度公式 ,利用遗传算法反演介质的各向异性参数。在多分量三维勘探中 ,通过 P- P方位变化的动校正速度 ,反演出 P波入射的垂直速度、Thomsen参数δ和地下裂缝的方位角 ,通过 P- S1 、P- P可以求得 S1 - S1 波随方位变化的动校正速度 ,反演出 S波入射的垂直速度和 Thomsen参数γ。为了有效地克制优化问题中的非线性、多峰值问题 ,本文采用遗传算法以得到全局最优解 ;并采用伪并行遗传算法 ,有效防止搜索过程中早熟现象的发生
ZHANG Shi-jun, YANG Hui-zhu, DONG Yuan, DU Qi-zhen.Inversion of anisotropy parameters of HTI media by genetic algorithm. Petroleum Geophysical Prospecting, 2 0 0 2, 37 (1): 2 4 ~ 2 8 Transverse isotropy HTI) media is the simplest azimuthal anisotropy model used to describe fractured reservoirs containing parallel vertical fractures. In this paper, aiming at the horizontal reflection interface of HTI media with arbitrary anisotropy, the formula of wave velocity correction is converted according to azimuth (the angle between line direction and principal axis), and the anisotropic parameters of media are retrieved by genetic algorithm. In multi - component 3D exploration, the vertical velocity of incident P wave, the Thomsen parameter δ and the azimuth of subterranean fracture can be inverted by the dynamic correction velocity of P - P azimuth change. Through S1 - P- and P- The dynamic correction velocity of S1 wave changes with azimuth, the vertical velocity of incident S wave and Thomsen parameter γ are inverted. In order to effectively control the non-linear and multi-peak problems in the optimization problem, this paper adopts genetic algorithm to get the global optimal solution, and adopts the pseudo-parallel genetic algorithm to effectively prevent the premature phenomenon in the search process