Method for Improving the Resolution of Coherent Energy Spectrum and Velocity Modeling Method for Prestack Depth Migration

Abstract

The invention provides a method for improving coherent energy spectrum resolution ratio and a modeling method for increasing prestack depth migration speed. The method for improving the coherent energy spectrum resolution ratio includes scanning a prestack depth migration imaging channel set and determining coherent energy spectrum data of a depth domain channel set; dividing the depth domain channel set into a plurality of depth sections; performing n power and absolute value operation on coherent energy spectrum data of one specific depth section and all depth sections with depths greater than that of the specific depth section, and obtaining new coherent energy spectrum data of the specific depth section and all the depth sections with depths greater than that of the specific depth section, wherein n is a positive number greater than or equal to 1 and the n corresponding to the coherent energy spectrum of the depth sections subjected to N power operation increases along with the increase of the depths of the depth sections. By adopting the method provided by the invention, the depth domain channel set coherent energy spectrum with the good resolution ratio can be obtained and the formation of a more reasonable prestack depth migration speed model is facilitated.

Description

technical field [0001] The present invention relates to the technical field of geophysical exploration, in particular to a method for improving the coherent energy spectrum resolution of pre-stack depth migration imaging gathers of seismic data, and a pre-stack depth migration velocity modeling method, especially It is beneficial to improve the resolution of coherent energy spectra at different depths. Background technique [0002] In the prior art, pre-stack depth migration velocity modeling is required during seismic data processing. In the pre-stack depth migration velocity modeling process, the coherent energy spectrum is formed by scanning the seismic data pre-stack depth migration imaging gather. [0003] However, in the actual processing process, since the coherent energy spectrum of the depth domain gather changes with the depth, the resolution of the coherent energy spectrum becomes lower and lower as the depth increases. This is the biggest difficulty faced by co...

AI Technical Summary

Problems solved by technology

[0003] However, in the actual processing process, since the coherent energy spectrum of the depth domain gather changes with the depth, when the depth increases, the resolution of the coherent energy spectrum becomes lower and lower

This is the biggest difficulty faced by coherent energy spectrum scanning