Abstract：The velocity analysis and NMO technique are very important in seismic data processing. The common NMO methods based on hyperbolic equation does not consider the influence of offsets variation on NMO velocities, therefore, the NMO results are imperfect and affect the stack and imaging effects. Non-hyperbolic equation is characteristic of higher approximate precision, but is unable to carry out interactive processing in velocity analysis because of multiple parameters. The paper proposed a new NMO approach that carries out common velocity analysis on different offsets gathers, uses high-order curves to fit separate hyperbolas and then uses high-order curves equation to carry out dynamic corrections. The tests of theoretic records showed the method is better than the common NMO method and similar to the high-order curves NMO methods but only picks up a small amount of velocity spectrum, while fourth-order curve fitting NMO method needs to pick up a great amount of velocity spectrum and sixth-order curve or fraction curve fitting methods are both complex in NMO conducting velocity spectrum and inconvenient for interactive processing. The approach presented in the paper better solved these difficulties.
谭俊敏, 陈雨红. 一种新的分炮检距动校正方法[J]. 石油地球物理勘探, 2007, 42(3): 263-267.
Tan Jun-min, Chen Yu-hong. A new NMO approach by separate offsets. OGP, 2007, 42(3): 263-267.
