NMO‐velocity surfaces and Dix‐type formulas in anisotropic heterogeneous media

摘要: Reflection moveout of pure modes recorded on conventional‐length spreads is described by a normal‐moveout (NMO) velocity that depends the orientation common‐midpoint (CMP) line. Here, we introduce concept NMO‐velocity surfaces, which are obtained plotting NMO as radius‐vector along all possible directions in 3‐D space, and use it to develop Dix‐type averaging differentiation algorithms anisotropic heterogeneous media.The intersection surface with horizontal plane represents ellipse can be estimated from wide‐azimuth reflection data. We demonstrate conventional‐spread whole modeled specifically oriented cross‐sections surfaces zero‐offset raypath. This formalism particularly simple implement for stack homogeneous layers separated dipping boundaries. Since our method involves computing j...