Passive source interference migration imaging method and system based on illumination direction constraint
A technology of offset imaging and lighting direction, applied in the direction of seismic signal receivers, etc., can solve the problems of unsatisfactory distribution of underground seismic sources and inaccurate imaging results, etc., and achieve the effect of wide application range and cost saving
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Embodiment 1
[0047] Such as figure 1 As shown, it is a schematic flow chart of the passive source interference migration imaging method based on illumination direction constraints in Embodiment 1 of the present application, which mainly consists of three steps: passive source interference, illumination information extraction, and illumination direction constraint migration imaging. The three steps of Embodiment 1 of the present application will be described in detail below.
[0048] The first step is to perform interference processing on the seismic records of the single-point pulse passive source to obtain the deconvolution function of the passive source. Through the deconvolution function, the inaccurate interference virtual shot record can be obtained.
[0049] For pulse-type passive sources, Wapenaar&Fokkema (2006) introduced that in the acoustic wave medium, when the passive sources are continuously and uniformly distributed (each located at x s , mark x in this embodiment one s In ...
Embodiment 2
[0094] Such as image 3 As shown, it is a schematic structural diagram of a passive source interference migration imaging system based on illumination direction constraints in Embodiment 2 of the present application, including a deconvolution module, an illumination analysis module, and an imaging module.
[0095] Among them, the deconvolution module is used to perform interference processing on the seismic records of the single-point pulse type passive source to obtain the deconvolution function, and the deconvolution function is used to obtain the virtual shot set record; the illumination analysis module is used to analyze the deconvolution function Perform oblique superposition processing, and extract the ray parameters corresponding to the peak value at time zero to obtain the effective illumination information direction; the imaging module is used to perform offset imaging processing on the virtual shot set records according to the deconvolution function and the effective ...
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