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Prestack time migration - SEG Wiki As stated early in the chapter, the rigorous solution to the problem of conflicting dips with different stacking velocities is prestack time migration The robust alternative in practice is to apply NMO and DMO corrections followed by poststack time migration
Kirchhoff Prestack Depth and Time Migration | SLB Kirchhoff prestack time migration (PSTM) can accurately image steep or overturned events, provided that turning rays and anisotropy are taken into account 3D Kirchhoff PSTM is ideally suited for imaging geological settings characterized by complex structure but relatively gentle velocity gradients
Pre-Stack Depth Migration and Reverse Time Migration Processing Test - NLOG ad band PreSTM processing flow was selected as base processing flow A PreSTM is known to be a cost-efficient migration algorithm that usually provides good imagin quality, except for structurally complex settings such as pre-salt More advanced imaging techniques such as PreSDM or Reverse Time Migration (RTM)
Pre-Stack Time Migration - Absolute Imaging Kirchhoff PSTM has several benefits over the “common zero offset” approach, primarily in its ability to improve structural imaging and provide correctly imaged pre-stack data for subsequent AVO analysis
Pre-stack time migration and velocity analysis methods with common . . . The procedure of pre-stack time migration can be divided into three steps: the first step is the data mapping from input data to CSP gathers by the equivalent offset; the second step is moveout correction on the CSP gathers; and the third step is the stacking of each CSP gather
Prestack time migration This module performs 2D 3D time migration of seismic traces before stack The algorithm is a Kirchhoff integral trace migration where each sample is considered the top of coherent events of a diffracted wave followed by stacking the samples
Pre-stack elastic reverse time migration in tunnels based on . . . After revealing the features of the PP and SS migration results in tunnel environment, the field case study indicates the potential of applying the proposed method in practical seismic forward-prospecting
Automatic migration velocity estimation for prestack time migration ABSTRACT Migration velocity analysis is a labor-intensive part of the iterative pre-stack time migration process We have proposed a velocity estimation scheme to improve the efficiency of the velocity analysis process using an automatic approach The proposed scheme is the numerical implementation of the conventional velocity analysis process
Highly scalable flexi-trace-based pre-stack time migration Pre-stack Time Migration (PsTM) has been widely adopted as a flexible seismic migration method PsTM is computationally intensive even with the high performance clusters; some 3D seismic data may take days or weeks to migrate the final image