Depth-domain seismic wavelet extraction and seismic record synthesis integrated method

Abstract

The present invention provides a technique for extracting depth-domain seismic wavelets by using depth-domain seismic data and using the depth-domain seismic wavelets to directly synthesize depth-domain seismic records, in particular, a depth-domain seismic wavelet extraction and seismic record synthesis integrated method. According to the method, the variation characteristics of seismic waveletsin space are considered, and depth-domain seismic records containing effective information in an entire stratum can be obtained. The method of the invention comprises the following main steps that: (1) depth, velocity and density information is obtained on the basis of the logging data of a certain well, and a corresponding reflection coefficient r is calculated according to the depth, velocity and density information; (2) in order to satisfy a requirement for wavelet extraction under a linear time invariant condition, with a constant velocity vc adopted as a reference velocity, constant velocity depth transformation is performed on the well side seismic trace S of the well and the reflection coefficient r, so that a transformed trace S1 and reflection coefficient r1 can be obtained, and depth-domain seismic wavelets w are extracted on the basis of a Gibbs sampling method; and (3) with a logging velocity v, the reflection coefficient r, and the extracted depth-domain wavelets w directly adopted as input, a depth-domain synthetic seismic record can be made.

Description

Technical field [0001] The invention belongs to the field of petroleum seismic exploration, and relates to a method for extracting depth-domain seismic wavelets from depth-domain seismic data, and combining the depth-domain forward modeling technology to produce depth-domain seismic records. Background technique [0002] Compared with pre-stack time migration, pre-stack depth migration technology is a more successful and effective seismic data processing method. Pre-stack depth migration technology can accurately determine the underground geological structure, and the noise suppression of low signal-to-noise ratio data is particularly prominent. This effective processing technology can better avoid exploration and development risks. At the same time, the obtained velocity field can also provide a basis for subsequent inversion and interpretation. Therefore, the horizon calibration of the depth domain seismic data is particularly important. [0003] The horizon calibration of dept...

AI Technical Summary

Problems solved by technology

[0004] The depth-domain synthetic seismic recording method based on the "linear time-invariant" convolution condition will have the problem of missing reflectance when the reflection coefficient is converted to the condition of constant velocity. This problem can be solved by increasing the sampling rate, but with As the sampling rate increases, the computing time required will also increase sharply.

In addition, when the seismic records at constant velocity are inversely transformed back to the synthetic seismic records in the depth domain, the new sampling point data will lead to the loss of higher frequency information in the seismic records

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