EDA介质与倾斜界面NMO速度对比研究

Comparison on NMO Velocity of EDA Medium and Dipping Interface

利用纵波特征检测裂缝发育带与裂缝发育方向是地震勘探中的热点问题,应用EDA介质中正常时差校正(NMO)速度的椭圆方程确定裂缝发育方向是检测方法之一;对均匀介质倾斜界面来说正常时差校正(NMO)速度也是椭圆方程。该研究就这2个椭圆方程的理论含义进行分析及应用纵波速度资料对裂缝发育方向检测中的应用问题进行探讨,指明应用NMO速度椭圆方程的长轴确定裂缝发育方向的不确定性。

In allusion to the hot topics on prediction of fracture-developed zones and the main azimuth of fracture in petroleum exploration and development,the determination of fracture growth direction by using the method of EDA medium NMO velocity was one of the methods of detection.For an even medium interface,NMO velocity was also an elliptic equation.The theoretical implication of 2 elliptic equations was analyzed and P-wave data were used to discuss the application of main azimuth of fracture detection.It is prove that the uncertainty of the azimuth of fracture is determined by using long axis of NMO velocity elliptic equation.