Method and apparatus for determining depth-domain seismic wavelet

Abstract

The embodiment of the application provides a method and apparatus for determining a depth-domain seismic wavelet. The method comprises: obtaining acoustic logging data and determining a depth-domain reflection coefficient sequence and depth-domain imaging data of a well position according to the acoustic logging data; and on the basis of the depth-domain reflection coefficient sequence and depth-domain imaging data of the well position, determining a depth-domain seismic wavelet. According to the method provided by the invention, a matrix equation is constructed based on the depth-domain reflection coefficient sequence and depth-domain imaging data to calculate a depth-domain-reflection-coefficient-sequence-based optimal matching operator using the depth-domain imaging data as an expected output, thereby obtaining the depth-domain seismic wavelet. Therefore, technical problems that the depth-domain seismic wavelet can not be calculated directly, the determination process is complicated, and the accuracy of the determined depth-domain seismic wavelet is poor according to the existing depth-domain seismic wavelet determination method can be solved; and thus a technical effect of determining the depth-domain seismic wavelet accurately and simply is realized.

Description

technical field [0001] The present application relates to the technical field of oil and gas exploration, in particular to a method and device for determining seismic wavelets in the depth domain. Background technique [0002] In oil and gas exploration, seismic wavelets, especially depth-domain seismic wavelets, are important seismic data. Generally, a seismic wavelet refers to a signal with a definite start time, limited energy, and a certain continuation length. It is the basic unit in a seismic record. It is generally believed that the seismic wave generated when the seismic source is excited is only a spike with a very short duration. As the spike propagates in the viscoelastic medium, the high-frequency components of the spike will quickly attenuate, and the waveform will increase accordingly. Then the seismic wavelet is formed, and then propagates underground in the form of seismic wavelet. Due to the above-mentioned characteristics of seismic wavelets, it is often...

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Problems solved by technology

[0005] The embodiment of the present application provides a method and device for determining the depth-domain seismic wavelet, so as to solve the problems existing in the existing depth-domain seismic wavelet determination method that the depth-domain seismic wavelet cannot be directly determined, and the determined depth-domain seismic wavelet cannot be directly determined. The technical problems of poor wave accuracy and complex determination process

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