裂隙介质的运动学特征反演与应用

Inversion of kinetic properties of P-waves in fractured media and its application

1. 中国地质大学研究生院，湖北武汉430074;2. 上海海洋石油局第一海洋地调查大队，上海200000;3. 中国石化南京石油物探研究所，江苏南京210014

1. China University of Geosciences, Wuhan 430074, China;2. The First Marine Geology Survey Brigade of Shanghai Offshore Petroleum Bureau, Shanghai 200000, China;3. Institute of Geophysical Prospecting, SIN OPEC Res

在物理模型实验观测的基础上,总结了裂隙介质中P波叠加速度随观测方位的变化规律。应用Grechka叠加速度公式,分析了速度椭圆参数与裂隙走向方位及发育强度之间的关系。利用全方位自适应速度扫描,开发了一种以目的层顶底叠加速度分析为基础,通过广义DIX公式求取层间叠加速度椭圆参数,并进一步预测层间裂隙特征的分析技术,将它应用于实际资料的反演,取得了满意的效果。

In this paper, the regularity of stack velocity variations with azimuth over aligned fractured media is outlined based on laboratory physical model observations, which provides the basis for fracture density analysis with P-wave signatures. The relations between parameters of stack velocity ellipse with strikes and density of fractures were discussed following Grechka's formula of stack velocity. By focusing on adaptive full azimuth stack velocity scanning, a new fracture property evaluation technique is developed which includes calculations of stack velocities above and below the target horizons, derivation of stack velocity ellipse using generalized DIX formula. Satisfactory results have been gained by applying the method to field data.