A method for making pre-stack depth-domain synthetic seismic records

Abstract

The invention discloses a production method for a prestack depth domain synthetic seismogram and relates to a petroleum seismic exploration forward numerical simulation technology. The production method comprises the following steps: firstly, converting depth domain seismic data into constant velocity depth domain seismic data by using a longitudinal wave velocity field; secondly, extracting depth domain seismic wavelets from the constant velocity depth domain seismic data; thirdly, transforming constant velocity depth domain seismic wavelets into a depth domain by using a longitudinal wave velocity model to obtain one group of depth domain seismic wavelet set matched with different depth stratal velocities, weighting the depth domain seismic wavelets by using a depth domain AVO (Amplitude Versus Offset) reflection coefficient, and then stacking to obtain a prestack depth domain synthetic seismogram angle gather. According to the technology, the problem that a depth domain convolution model cannot meet an algorithm with linear time invariant conditions is solved; the production method can be used as a basis for direction deduce analysis of depth domain seismic data and inversion of prestack depth domain parameters.

Description

technical field [0001] The invention relates to the field of numerical simulation of forward modeling in petroleum seismic exploration, and establishes a technology for calculating pre-stack seismic forward modeling record angle gathers in the depth domain by using the seismic wavelet in the depth domain and the seismic elastic parameters in the depth domain dependent on the formation velocity. Algorithmic problems of non-satisfactory linear time-invariant systems in domain convolution models. Background technique [0002] Using the elastic parameter model to simulate the seismic records is an important basis for studying the seismic response characteristics of the physical properties of the reservoir and inverting the rock elastic parameters of the reservoir. The convolution of seismic wavelets and reflection coefficients is one of the main means to realize the forward modeling of time-domain seismic records. However, in the depth domain, the seismic wavelet is controlled ...

AI Technical Summary

Problems solved by technology

The technique of synthesizing depth-domain seismic records by using the convolution operation of constant depth-domain seismic wavelets and reflection coefficients does not consider the variation properties of the depth-domain seismic wavelet-dependent velocity in the depth domain; The depth-domain seismic record synthesis method, the non-uniform resampling of the pseudo-depth domain reflection coefficient will lead to the loss of part of the reflection coefficient information, and the missing sampling of the reflection coefficient can be avoided unless a very high sampling rate is used; in addition, when executing In the process of inverse transformation to the depth domain to obtain synthetic seismic records, due to interpolation and consistent resampling, the newly added depth sampling point data directly leads to the loss of effective information of higher frequencies in the synthetic seismic records

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