A method for making depth-domain synthetic seismic records

Abstract

The invention relates to a method for making synthetic seismic records in depth domain. It solves the problems of low wavelet extraction accuracy and low depth-domain well-seismic matching in existing depth-domain synthetic records. The method includes the following steps: firstly, the depth-domain seismic imaging data track passing through the well is converted to the pseudo-depth domain by using the depth-domain imaging speed of the corresponding position, and the seismic wavelet is extracted at the linear time-invariant pseudo-depth; The formation reflection coefficient considering the formation transmission attenuation effect is obtained through conversion, and the stable and smooth velocity is converted to the pseudo-depth domain, and the convolution operation is completed with the pseudo-depth domain seismic wavelet, and then the stable and smooth velocity is converted back to the depth domain, so that Completed the production of depth-domain synthetic seismic records. This method effectively solves the difference between the velocity of well logging data and surface seismic data, realizes the linear time-invariant extraction of deep-variable seismic wavelets, improves the correlation coefficient of well-seismic calibration in depth domain and the production accuracy of synthetic records in depth domain, and reduces the error .

Description

Technical field: [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for making a synthetic seismic record in a depth domain. Background technique: [0002] The production of seismic forward modeling and its use in horizon calibration is the basis of structural interpretation and reservoir analysis, an important bridge connecting seismic geology and well logging, and an effective means of verifying geophysical processing and interpretation methods. As oil and gas exploration targets gradually turn to low-amplitude structures and thin layers, it becomes more difficult for seismic interpreters to understand subsurface structural layers through events in seismic sections. For fine amplitude-preserving seismic processing, structural interpretation and fine lithology inversion, the wrong matching of events and structural layers will lead to incorrect or even wrong geological understandings and conclusions. Therefore, the resear...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to overcome the problems of low wavelet extraction accuracy and low depth-domain well-seismic matching existing in the existing depth-domain synthetic records in the background technology, and provides a method for making depth-domain synthetic seismic records

The method for making synthetic seismic records in the depth domain can effectively solve the difference between the velocity of well logging data and the velocity of surface seismic data, realize the linear time-invariant extraction of seismic wavelets in the depth domain, and improve the correlation coefficient of well-seismic calibration in the depth domain and the synthesis in the depth domain Record production accuracy and reduce the error caused by data conversion in different domains caused by data resampling. At the same time, it can also create a multi-dimensional forward model in the depth domain by adding dimensions to meet practical needs

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