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Depth domain seismic wavelet extraction method and device, storage medium and computer equipment

A technology of seismic wavelet and extraction method, applied in the fields of seismology, measurement device, seismic signal processing, etc., can solve the problems of error, time shift of reflection coefficient, loss of detailed information, etc.

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of converting the logging data in the depth domain to the time domain, it is inevitable that the logging curve is stretched or compressed in the time domain, which will inevitably cause the time shift of the reflection coefficient, thereby introducing errors
At the same time, the log curve after time-depth conversion may lose many important details

Method used

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  • Depth domain seismic wavelet extraction method and device, storage medium and computer equipment
  • Depth domain seismic wavelet extraction method and device, storage medium and computer equipment
  • Depth domain seismic wavelet extraction method and device, storage medium and computer equipment

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Embodiment 1

[0022] This embodiment provides a method for extracting seismic wavelets in the depth domain, figure 1 It is a flow chart of a method for extracting depth-domain seismic wavelets according to an exemplary embodiment of the present application. Such as figure 1 As shown, the method includes the following steps:

[0023] S100: Determine the time domain data of the seismic traces beside the well according to the depth domain data of the seismic traces beside the well.

[0024] S200: In the time domain, use the convolution model to determine the corresponding seismic wavelet in the time domain according to the time domain data of the seismic traces next to the well.

[0025] S300: Determine a corresponding seismic wavelet in the depth domain according to the seismic wavelet in the time domain.

Embodiment 2

[0027] This embodiment provides a method for extracting seismic wavelets in the depth domain, including the following steps:

[0028] The first step is to determine the time domain data of the seismic traces beside the well according to the depth domain data of the seismic traces beside the well.

[0029] Wherein, the depth domain data of the side-hole seismic trace includes a plurality of sampling data of the depth-domain compressional wave velocity of the side-hole seismic trace; correspondingly, the time-domain data of the side-hole seismic trace includes the time-domain compressional wave speed data.

[0030] When the depth-domain data of the side-hole seismic trace includes a plurality of sampling data of the depth-domain compressional wave velocity of the side-hole seismic trace, and the time-domain data of the side-hole seismic trace includes the time-domain compressional wave velocity data of the side-hole seismic trace, according to Depth-domain data of side-hole sei...

Embodiment 3

[0042] This embodiment provides a specific embodiment of a method for extracting seismic wavelets in the depth domain, which specifically includes the following steps:

[0043] In the first step, the reflection coefficient is calculated according to the logging data:

[0044] s(t)=w(t)*r(t) (1)

[0045] Among them, s(t) is the synthetic seismic record, r(t) is the reflection coefficient sequence, and w(t) is the seismic wavelet;

[0046] The reflection coefficient r(t) of an interface is obtained from the wave impedance of the upper and lower layers, and its expression is:

[0047]

[0048] In the formula, R is the reflection coefficient, ρ 1 , ρ 2 is the density of the upper and lower layers of the interface, v 1 , v 2 is the velocity of the upper and lower layers of the interface, the density of the upper and lower layers of the interface and the velocity of the upper and lower layers of the interface can be obtained from the logging data.

[0049] In the second step,...

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Abstract

The invention provides a depth domain seismic wavelet extraction method and device, a storage medium and computer equipment. The method comprises the following steps: determining time domain data of a well-side seismic channel according to depth domain data of the well-side seismic channel; in the time domain, determining seismic wavelets of the corresponding time domain according to the time domain data of the seismic channel beside the well by using the convolution model; and according to the seismic wavelets of the time domain, determining the seismic wavelets of the corresponding depth domain. According to the method, depth domain data of a well-side seismic channel is converted into a time domain by adopting a well-side seismic channel time-depth conversion method, wavelets of the time domain are solved by using a convolution model in the time domain, and then the seismic wavelets of the time domain are converted into the depth domain, so that more accurate depth domain time-invariant wavelets are obtained.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration in the petrochemical industry, in particular to a method, device, storage medium and computer equipment for extracting seismic wavelets in the depth domain. Background technique [0002] The current conventional seismic data inversion methods are almost all completed in the time domain, and the wavelets required for the inversion are also obtained based on the convolution model in the time domain. In the inversion process, the convolution model is widely used because of its simple form and strong applicability. In the time domain, the most commonly used method is to convolve the wavelet in the time domain with the reflection coefficient in the time domain to obtain a synthetic seismic record. Among them, the reflection coefficient in the time domain is usually obtained from the logging data in the depth domain after depth-time conversion. In the process of converting the logging ...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/30G01V1/282G01V2210/60G01V2210/66
Inventor 周单
Owner CHINA PETROLEUM & CHEM CORP