用遗传算法反演裂隙各向异性介质

Inversing fractured anisotropic media through a genetic algorithm

1. 长春地质学院地球物理系, 长春130026;2. 国家海洋局第二海洋研究所, 杭州310012

Geophysical Department, Changchun University of Earth Science, Changchun 130026.

自Crampin和Busk(1986) 指出横波双折射可为油气藏开发提供一种有用的工具以来, 国外利用VSP的横波分裂检测来研究裂隙型油气藏的工作大为增加。以往, 主要通过分析偏振图或旋转记录的坐标轴来确定裂隙各向导性介质的参数。但是, 这些方法都有一些缺陷和问题, 因此, 近几年来发展了多种分析横波分裂的新方法。本文采用全局搜索的遗传算法反演含裂隙介质的参数, 理论实例表明, 该法是有效的并有一定抗噪能力。

Since Crampin and Busk pointed out in 1986 that the S-wave birefringcnce method can be auseful tool for developing oil and gas reservoirs, the studies of ftactured reservoirs through Swave split detection of VSP has been increasing oversea' Traditionally, the patameters offractuced anisotropic media are mainly determined by analyaing polarization graphs or rotating thecoordinates of records. However, there are some shortcomings in the methods, and therefore,some new methods of analyzing S-wave split have been developed in recent years. This paperpresents the genetic algorithm using global searching to inverse parameters of fractured media.