A reverse time migration imaging method and device
A technology of reverse time migration imaging and reverse time migration, applied in seismic signal processing and other directions, can solve the problems of destroying the effective signal of data, damaging the effective signal, destroying the amplitude preservation of reverse time migration, etc., and achieves high amplitude preservation, The effect of eliminating low-frequency noise and improving computing efficiency
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Embodiment 1
[0027] figure 1 is a flowchart of a reverse time migration imaging method provided by an embodiment of the present invention, such as figure 1 As shown, the reverse time migration imaging method includes the following steps:
[0028] S101. Acquiring source wave field information and receiver point wave field information.
[0029] In the embodiment of the present invention, step S101 may include the following sub-steps:
[0030] Obtain single shot data and perform pre-stack preprocessing on single shot data;
[0031] The forward wave field extrapolation and reverse time extrapolation of the single shot data output by the pre-stack preprocessing are used to obtain the source wave field information and receiver point wave field information at each time step.
[0032] Specifically, single-shot data collected by seismic data can be loaded; pre-stack preprocessing such as static correction and denoising can be performed on the loaded single-shot data in order to obtain single-sho...
Embodiment 2
[0061] In order to test the accuracy and stability of the present invention, this embodiment tests the most typical BP (British Petroleum, British Petroleum) mathematical model in the geophysical field. image 3 is a flow chart of a reverse time migration imaging method provided in this embodiment, such as image 3 As shown, the reverse time migration imaging method includes the following steps:
[0062] S301, loading the seismic shot records obtained by the forward modeling of the BP model into the work area.
[0063] S302, using an effective denoising method to remove various noises in the seismic records step by step and domain by domain, and then re-extract to the shot domain.
[0064] S303, providing an accurate BP mathematical model for forward single-shot recording as a velocity-depth model of reverse time migration.
[0065] S304. Realize forward wave field extrapolation and reverse time extrapolation of the seismic single-shot data output in step S302 on a GPU / CPU h...
Embodiment 3
[0072] Figure 4 It is a module diagram of a reverse time migration imaging device provided by an embodiment of the present invention. The reverse time migration imaging device uses the method described in Embodiment 1 to generate a reverse time migration imaging section, as shown in Figure 4 As shown, the reverse time migration imaging device includes:
[0073] The wave field information acquiring unit 401 is configured to acquire the wave field information of the seismic source and the wave field information of the receiver point.
[0074] In the embodiment of the present invention, the wave field information acquisition unit 401 may also include:
[0075] The preprocessing module is used to obtain single-shot data and perform pre-stack preprocessing on single-shot data;
[0076] The extrapolation processing module is used for forward wave field extrapolation and reverse time extrapolation of single shot data output by pre-stack preprocessing, and obtains source wave fiel...
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