Method and system for determining seismic reflection event isochronism

Abstract

The invention provides a method and system for determining seismic reflection event isochronism. The method includes the steps that seismic data are collected; spectrum analysis is performed on the seismic data to obtain frequency width and basic frequency corresponding to the seismic data; according to the frequency width and the basic frequency, selectivity filtering is performed on the seismic data to obtain different seismic bodies with different main frequencies; reflection event inclination angles corresponding to the seismic bodies with the different main frequencies are determined; according to the reflection event inclination angles and the seismic data, the reflection event isochronism is determined; according to the reflection event isochronism, isochronal stratal slices are generated, and oil and gas exploration is performed. On the basis of fractional frequency of the seismic data, the seismic reflection event isochronism is effectively judged by combining inclination angle calculation and data cube fusion display, and thus development of the seismic sedimentation analysis technology is promoted.

Description

technical field [0001] The present invention relates to the technical field of oil exploration, in particular to the oil and gas exploration technology based on seismic sedimentology, specifically a method and system for determining the isochronism of seismic reflection events. Background technique [0002] With the advancement of seismic acquisition and processing technology, seismic sedimentology plays an increasingly important role in oil and gas exploration. Stratigraphic slice technology is one of the key technologies in seismic sedimentology analysis. Stratigraphic slicing is a technique for studying the plane distribution of sedimentary systems and sedimentary facies by slices of a series of layers interpolated in equal proportions along two isochronous interfaces. Currently commonly used slicing techniques include time slicing, layer-wise slicing and stratigraphic slicing. The following will introduce them one by one. [0003] Time slicing is to slice and display ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of whether the seismic reflection event is isochronous, the present invention provides a reflection event isochronous analysis technology based on wavelet frequency division, dip angle calculation and data volume fusion display, which solves the The difference in impedance is small, the resolution of conventional seismic sections is low, and it is difficult to determine whether the event is isochronous. The breakthrough technology of combining wavelet frequency division, dip calculation and data volume fusion can effectively predict the isochronism of the event

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