小生境遗传算法在地震CT中的应用研究

Study of niche genetic algorithms applied to seismic CT

针对含单相饱和流体的孔隙介质,综合费马原理、等效孔隙介质理论、Radon变换等,提出了基于地震CT技术求解速度、孔隙度和岩石密度的小生境多参数反演算法.以此为基础,经过改进,形成了物性参数的隔离小生境反演算法.理论分析与实例计算结果表明,该方法简化了波在层状介质中的传播方程,具有一定的实用价值,可以有效解决井间测井地层问题,获得较高精度的地层物性参数;而且模型简单,有精度高、多峰优化等特点,可用于地下层状介质中油气的寻找,满足油气预测与勘探开发的要求.

In order to quicken search, meet predicting and exploring for the oil and gas in stratiform media underground, a niche multi-parameter inversion algorithm is posed. The method is grounded on the seismic CT technology, aimed at the porous media full of single-phase fluid, integrated Fermat principle, the equivalent model of porous media, and Radon transform etc. On the base of the algorithm, an isulation niche inversion algorithm came into being. From theoretical analysis and result of inversion, it may be drawn that the method predigested wave-propagation equations in stratiform media, possess a definite use-value, can settle the problem of strata imaging between wells, used a simple model, be of high accuracy and multimodal optimization.