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Pre-stack elastic parameter inversion method and device, computer equipment and storage medium

An elastic parameter and inversion technology, applied in the field of device, computer equipment and storage medium, in the field of pre-stack elastic parameter inversion method, can solve the problems of estimation result error, low accuracy and resolution of seismic inversion, and improve the resolution. The effect of rate and accuracy

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

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Problems solved by technology

The above prior distributions all assume that the reflection coefficient is a random variable, and its distribution satisfies a specific distribution represented by a certain parameter. When the distribution of the reflection coefficient does not meet the specific distribution, errors may occur in the estimation results of the reflection coefficient. Prestack seismic inversion of elastic parameters low accuracy and resolution

Method used

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  • Pre-stack elastic parameter inversion method and device, computer equipment and storage medium
  • Pre-stack elastic parameter inversion method and device, computer equipment and storage medium
  • Pre-stack elastic parameter inversion method and device, computer equipment and storage medium

Examples

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no. 1 example

[0047] see figure 1 , in this embodiment, a pre-stack elastic parameter inversion method is provided, the method includes:

[0048] S110, acquiring pre-stack seismic data.

[0049] Specifically, the pre-stack elastic parameter inversion technology in this embodiment is a process of obtaining rock elastic parameters by means of inversion by utilizing the amplitude λ variation characteristic of pre-stack seismic data with angle. Therefore, the acquired pre-stack seismic data can be the pre-stack seismic data of a certain incident angle, or the pre-stack seismic data of N different incident angles; and the pre-stack seismic data of different incident angles can be expressed as reflection coefficients of different angles Convolution with wavelets of different angles. For example, prestack seismic data with different incident angles are simulated by convolution of a Reich wavelet with a main frequency of 30 Hz and a sampling interval of 1 ms.

[0050] S120. Obtain the reflection...

no. 2 example

[0172] This embodiment provides a pre-stack elastic parameter inversion device, and the pre-stack elastic parameter inversion device is realized by using the pre-stack elastic parameter inversion method described in any of the above-mentioned embodiments. In one of the embodiments, the pre-stack elastic parameter inversion device includes corresponding modules for implementing each step of the pre-stack elastic parameter inversion method.

[0173] In one of the embodiments, a pre-stack elastic parameter inversion device is provided, the device includes:

[0174] Seismic data acquisition module, used to acquire pre-stack seismic data;

[0175] A reflection coefficient acquisition module, configured to obtain the reflection coefficient of the elastic parameter;

[0176] The forward modeling matrix construction module is used to construct the forward modeling matrix of the pre-stack seismic data based on the Fatti approximation equation according to the pre-stack seismic data an...

no. 3 example

[0204] In this embodiment, a computer device is provided, and its internal structure diagram can be as follows Figure 7 shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. Wherein, the processor of the computer device is used to provide calculation and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a pre-stack elastic parameter inversion method is realized. The display screen of the computer device may be a liq...

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Abstract

The invention provides a pre-stack elastic parameter inversion method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring pre-stack seismic data; obtaining a reflection coefficient of the elastic parameter; constructing a forward modeling matrix of the pre-stack seismic data; obtaining a likelihood function of the seismic data according to the forward modeling matrix; according to a likelihood function and prior information; obtaining an objective function of elastic parameter inversion; based on a maximum likelihood estimation method, converting the likelihood function into a maximum edge likelihood function; solving the maximized edge likelihood function to obtain an estimation factor; according to an estimation factor and a target function, an elastic parameter is obtained through inversion, priori information of the elastic parameter is fused into inversion by introducing automatic correlation discrimination priori information, and assumption of overall distribution of reflection coefficients of the elastic parameter is not needed, so that the reflection coefficients of the elastic parameter are kept sparse, lithologic boundary features are better reflected, and the accuracy of the lithologic boundary is improved. Therefore, the resolution and the accuracy of the pre-stack elastic parameter inversion result are improved.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a pre-stack elastic parameter inversion method, device, computer equipment and storage medium. Background technique [0002] Seismic exploration is a method of petroleum exploration using seismic information. Since seismic information can reflect the changing trend of reservoir parameters, this method can be used to predict reservoir parameters. There are two types of seismic data: pre-stack and post-stack. The pre-stack AVA (Amplitude Versus Angle, amplitude varies with incidence) inversion technology refers to the process of obtaining rock elastic parameters by means of inversion by using the amplitude-versus-angle variation characteristics of pre-stack seismic data. Compared with post-stack inversion, pre-stack inversion plays a vital role in reservoir description because it utilizes information from data at different incident angles and can obtain more diverse el...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/6242G01V2210/64
Inventor 纪永祯张渝悦胡华锋
Owner CHINA PETROLEUM & CHEM CORP
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