A high-precision extraction method for converted wave co-converted point gathers based on regularization

Abstract

The invention discloses a converted wave common conversion point gather high-precision extracting method based on regularization. Processing of the two aspects of surface element regularization and offset regularization are specifically introduced in, the converted wave common conversion point gather high-precision extracting method is particularly suitable for gathering process of converted wave common conversion point gathers with simple conditions on the ground surface and under the ground, and the method has the advantages of being simple in calculation step, good in processing effect and the like and has the wide application prospect in high-precision processing of current converted wave seismic data.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas seismic exploration, and more specifically relates to a regularization-based high-precision extraction method of converted wave co-conversion point gathers mainly used in the processing and interpretation of field converted wave seismic data in petroleum seismic exploration. Background technique [0002] Since multi-wave exploration makes more use of various waveform characteristics in the seismic exploration process, it shows its unique advantages in lithology analysis, fluid identification, fracture detection, and imaging of gas cloud areas. More and more attention has been paid to it, especially with the practical application of multi-component submarine cable (OBC) technology in recent years, the processing of converted waves has gradually developed from the research field to the conventional production field. The conventional process of P (longitudinal wave)-SV (converted sh...

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Problems solved by technology

The layered co-converted line selection method can make the converted waves at different depths achieve better focusing effect, but it needs to splicing gathers between different layers, and there are some problems in actual operation

[0006] The second category includes DMO methods, depth-dependent mapping methods, and model-based co-conversion point gather selection methods. These methods do not use the traditional method of extracting CCP gathers, but use the recorded data to Direct processing eliminates the normal time difference and the lateral displacement of the conversion point to achieve the purpose of imaging, but the lack of dependence on the model restricts the practical application of this method in complex areas

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