Depth domain synthetic seismic record making method and device

Abstract

The invention discloses a depth domain synthetic seismic record making method and device. The depth domain synthetic seismic record making method comprises the steps of: acquiring seismic wavelets andlogging data, and determining a seismic interval velocity and a depth domain reflection coefficient according to the logging data; utilizing seismic wavelet and the depth domain reflection coefficient to perform seismic wave equation forward modeling, and determining a time domain synthetic seismic record; and performing pre-stack depth migration on the time domain synthetic seismic record according to the seismic interval velocity to obtain a depth domain synthetic seismic record. The depth domain synthetic seismic record making method and the device provided by the invention can effectivelyreflect the changes of the stratum speed and the transverse speed in the time-depth conversion process, reflect the changes in the synthetic seismic record, and lay a foundation for determining the reasonable depth position of actual seismic data and reservoir parameters of a target interval.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a method and device for producing synthetic seismic records in depth domain. Background technique [0002] Making artificial synthetic seismic records is an important technology in seismic data interpretation or processing. It is used to establish the connection between well data and seismic data. Through synthetic seismic records, the reasonable depth position of actual seismic data can be determined, and the target interval can be determined. reservoir parameters. Conventional synthetic seismic records are made in the time domain. With the development of depth migration processing technology, more and more seismic data are seismic data in the depth domain. In the depth-domain synthetic seismic record production method, the reflection coefficient obtained from the acoustic logging and density logging data is usually convolved with the wavelet to obtain a synthet...

AI Technical Summary

Problems solved by technology

However, the synthetic seismic record produced by this method is too ideal. During the conversion process from the synthetic seismic record in the time domain to the depth domain, the formation velocity will be stretched or compressed, and the lateral velocity will also change drastically. The synthetic seismic record waveform The depth and depth positions cannot reflect the influence of formation velocity and lateral velocity changes during the time-depth conversion process, and the obtained synthetic seismic records in the depth domain are inaccurate

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