Time domain migration imaging method and device
A technology of migration imaging and time domain, applied in the field of seismic exploration, can solve the problems of high-frequency information destruction, affecting the accuracy of inversion processing and attribute extraction, and achieve the effect of improving precision and accuracy
Active Publication Date: 2018-05-15
BGP OF CHINA NAT GASOLINEEUM CORP +1
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[0006] An embodiment of the present invention provides a time-domain migration imaging method to solve the technical problem in the prior art that the high-frequency information in the migration stacking section is severely damaged, which affects the accuracy of subsequent inversion processing and attribute extraction. Methods include:
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[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0053] In the present invention, a time-domain migration imaging method is provided, by which the high-frequency noise interference information in the Kirchhoff time migration can be eliminated, and in this method, cubic convolution interpolation is used to perform interpolation calculation of travel time to meet The first-order continuity of the migration operator can effectively eliminate the flat high-frequency noise energy and ensure the correctness of the high-frequency information in the migration imaging results.
[0054] Specifically, such as figure 1 As shown, the time domain migratio...
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The present invention provides a time-domain migration imaging method and device, wherein the method includes: reading a piece of seismic data; calculating the first travel time from the seismic source of the track to the coarse-grid imaging point of the imaging track through the double square root formula , and the second travel time from the coarse grid imaging point to the receiving point, and the sum of the first travel time and the second travel time is used as the round-trip travel time of the coarse grid imaging point; through the cubic convolution interpolation formula, according to the The two-way travel time of the coarse grid imaging point is interpolated to calculate the two-way travel time of the fine grid imaging point; according to the two-way travel time of the fine grid imaging point, energy is picked up on the input seismic trace as the imaging of the input trace As a result, the final migration result is the superposition of all input seismic trace imaging results. The invention solves the technical problem that the high-frequency information in the migration stacking section is severely damaged in the prior art, and achieves the technical effect of effectively improving the precision and accuracy of the imaging result.
Description
technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a time domain migration imaging method and device. Background technique [0002] Due to its high computational efficiency and flexibility, Kirchhoff migration is still a common time-domain migration imaging method in the industry. The essence of Kirchhoff migration is the superposition and summation of the seismic data along the subsurface imaging point diffraction traveltime curves, that is, firstly, for each seismic trace, the traveltime from each subsurface imaging point to the source and receiver points corresponding to the trace is calculated, Then according to the travel time, energy is picked up on this seismic trace and superimposed, and the final superimposed result is the imaging value of this point. [0003] However, in the implementation of Kirchhoff migration, in order to improve the computational efficiency, the travel time and amplitude are usually cal...
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IPC IPC(8): G01V1/28G01V1/32
Inventor 岳玉波钱忠平史云燕孙鹏远李建峰徐少波
Owner BGP OF CHINA NAT GASOLINEEUM CORP