Method for reducing calculation amount of reverse time migration surface geophone offset gather
A technology of reverse time migration and offset, which is applied in the comprehensive fields of exploration geophysics and inversion, and can solve the problems of complex calculation process and large amount of calculation of reverse time migration surface offset gathers
Active Publication Date: 2020-10-30
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
[0004] The purpose of the present invention is to provide a method for reducing the calculation amount of reverse time migration surface offset gathers to solve the problem of complex calculation process and large calculation amount of reverse time migration surface offset gathers
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Embodiment 1
[0032] Embodiment 1 provides a method for reducing the calculation amount of reverse time migration surface offset gather, including the following steps:
[0033] Step S1: select part of the offsets from the offset records, and generate reverse time migration surface offset gathers after thinning;
[0034] Step S2: Offset the selected sparse offset to obtain a sparse offset graph;
[0035] Step S3: The images of the remaining offsets are generated by constructing oblique-guided interpolation, which specifically includes the following steps:
[0036] Step S31: using a plane wave deconstruction filter to select local coherent events from the sparse migration data;
[0037] Step S32: Calculation of depth domain parameters
[0038] For each event, calculate the geological offset dip ξ measured on the common offset axis and the residual slope in the surface offset gather through the picking process The horizontal coordinate value x, the vertical coordinate value z, and the half...
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The invention discloses a method for reducing the calculation amount of a reverse time migration surface geophone offset gather, and the method comprises the following steps: S1, selecting a part of geophone offset from a geophone offset record, and generating the reverse time migration surface geophone offset gather after sparseness; S2, offsetting the selected sparse geophone offset to obtain asparse geophone offset graph; S3, generating images of other offset distances by constructing an inclined guide interpolation; and S4, applying plane wave deconstruction filter interpolation on the original trace gather data to obtain denser data, and reconstructing a trace gather at a denser offset to form a dense offset graph. According to the method for reducing the calculation amount of the reverse time migration surface geophone offset gather, the imaging quality of the reverse time migration surface geophone offset gather is guaranteed, the calculation amount is reduced, and a brand-newand feasible calculation method is provided for a seismic velocity model under complex geological conditions.
Description
technical field [0001] The invention relates to the field of comprehensive exploration geophysics and inversion technology, in particular to a method for reducing the calculation amount of reverse time migration surface offset gathers by using local interpolation of coherent events. Background technique [0002] In dealing with steep-dipping structures and complex velocity models, compared with conventional ray migration algorithms such as one-way wave equation migration algorithm and Kirchhoff migration algorithm, reverse time migration (Reverse Time Migration, Abbreviated as RTM) using cross-correlation imaging conditions to extract common imaging point gathers (Common Imaging point Gathers, abbreviated as CIG) to obtain the velocity model method imaging is more accurate and has no inclination limit, excellent amplitude preservation, suitable for complex velocity models, It is one of the most widely used prestack depth migration methods. [0003] The reverse time migratio...
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Login to View More IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/303G01V1/36G01V1/362G01V1/364G01V2210/324G01V2210/53G01V2210/6222
Inventor 赵杨郝新源左佳卉陈海潮
Owner CHINA UNIV OF PETROLEUM (BEIJING)