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Elastic wave direct envelope inversion method based on rock physical constraints

A rock physics and elastic wave technology, applied in the field of shear wave velocity structure of strong scattering medium, can solve problems such as longitudinal and shear wave velocity modeling, and achieve the effect of improving the effect of multi-parameter decoupling

Inactive Publication Date: 2020-08-07
JILIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a new elastic wave multi-parameter inversion method for strong scattering media to solve the problem of modeling the longitudinal and shear wave velocities of strong scattering reservoirs in seismic exploration of oil and gas resources. Scattered Reservoir Imaging Provides High Accuracy Velocity Models

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  • Elastic wave direct envelope inversion method based on rock physical constraints
  • Elastic wave direct envelope inversion method based on rock physical constraints
  • Elastic wave direct envelope inversion method based on rock physical constraints

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Embodiment 1

[0063] The overall process of the present invention is as figure 1 shown.

[0064] Assume that the underground true P-wave and S-wave velocity models are as follows: figure 2 shown in a and 2b. In the true velocity model, the background velocity is uniform, and there is a strong scattering salt dome in the middle. The velocity ratio of longitudinal to transverse waves is 1.5. The observed seismic records can be obtained by performing forward modeling on the real model. The source wavelet waveform and frequency spectrum are as follows: image 3 As shown in a and 3b, in order to simulate the lack of low-frequency information in actual seismic acquisition, high-pass filtering is performed on the Lake wavelet to cut off the low-frequency information below 4 Hz, and the main frequency of the source wavelet is about 9 Hz. Using the observation records to analyze the background velocity, the background P-wave velocity is obtained, and the initial P-wave velocity model is establi...

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Abstract

The invention relates to an elastic wave direct envelope inversion method based on rock physical constraints. According to the method, the longitudinal wave velocity structure of a strong scattering medium is obtained through wave field mode decomposition and elastic wave direct envelope inversion, and the transverse wave velocity structure of the medium is calculated according to a rock physicalrelation. The method comprises the following steps of: firstly, performing wave field mode decomposition on an elastic wave field to obtain a longitudinal wave field, and obtaining a longitudinal wavevelocity gradient through the cross-correlation of forward propagation longitudinal waves and an accompanying longitudinal wave field; secondly, the updating amount of the transverse wave velocity can be calculated according to the rock physical relation, and performing updating to obtain large-scale longitudinal and transverse wave velocity structures of the strong scattering medium; and finally, taking an elastic wave direct envelope inversion result as an initial model, and performing elastic wave full-waveform inversion to obtain the high-precision longitudinal and transverse wave velocity model of the strong scattering medium. The longitudinal and transverse wave velocity decoupling effect of the strong scattering medium is improved, the high-quality longitudinal wave velocity structure is obtained, and the rock physical constraints are applied in inversion, so that the transverse wave velocity structure of the strong scattering medium is obtained.

Description

Technical field: [0001] The invention relates to a method for obtaining the longitudinal wave velocity structure of a strong scattering medium by using wave field pattern decomposition and elastic wave direct envelope inversion, and applying rock physics constraints in the elastic wave direct envelope inversion to obtain a strong scattering medium shear wave velocity structure. Background technique: [0002] Strong scattering media can usually form a good storage medium for oil and gas resources. Therefore, the high-precision parameter modeling method of strong scattering media has attracted great attention in the field of exploration geophysics. The full waveform inversion method is currently the method with the highest parameter modeling accuracy in the field of exploration seismic, which can make full use of the kinematics and dynamics information of the seismic wave field. In recent years, people hope to use the full waveform inversion method to carry out high-precision ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/282G01V1/303G01V2210/6222G01V2210/66
Inventor 张盼韩立国尹语晨董士琦尚旭佳
Owner JILIN UNIV
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