Pre-stack seismic inversion method based on Rytov-WKBJ approximation

A pre-stack seismic and inversion technology, applied in the field of pre-stack seismic inversion based on Rytov-WKBJ approximation, to reduce ill-posedness, improve accuracy, improve simulation accuracy and calculation efficiency

Active Publication Date: 2021-06-25
ZHEJIANG UNIV
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Problems solved by technology

[0018] Aiming at the inversion problem of geological models with complex geological structures with strong heterogeneity, the present invention proposes a pre-stack AVA inversion method suitable for near-surface and shallow reservoirs with strong heterogeneity and complex geological structures, which improves the inversion The precision of the result

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  • Pre-stack seismic inversion method based on Rytov-WKBJ approximation
  • Pre-stack seismic inversion method based on Rytov-WKBJ approximation
  • Pre-stack seismic inversion method based on Rytov-WKBJ approximation

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Embodiment Construction

[0084] The present invention will be further described below in conjunction with the accompanying drawings, which cannot be used to limit the protection scope of the present invention.

[0085] A set of well logging data tests is taken as an example for illustration, such as figure 1 As shown, the specific implementation process of the present invention includes the following steps:

[0086] 1. Forward modeling of synthetic seismic angle gather data based on Rytov-WKBJ approximation

[0087] Perform dynamic correction on the common center point pre-stack seismic data of the reservoir to obtain root mean square velocity information, perform time-depth conversion on the pre-stack angle gather seismic data in the time domain to obtain depth domain seismic data; The post-seismic data is used for horizon picking to obtain the seismic horizon data near the oil and gas reservoir section, and the depth domain low-frequency model is constructed based on the inverse distance weighting ...

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Abstract

The invention discloses a pre-stack seismic inversion method based on Rytov-WKBJ approximation. The method comprises the following steps of 1, acquiring common midpoint pre-stack seismic data, pre-stack angle gather data, post-stack seismic data and logging data of a reservoir; 2, obtaining depth domain seismic data; 3, constructing a depth domain low-frequency model by using the seismic horizon data and the logging data of the reservoir; 4, constructing a target function; 5, solving the target function by using a Gaussian-Newton method to obtain a model update quantity, and updating a model disturbance quantity; 6, if the error level of the pre-stack seismic angle gather data and the synthetic seismic data reaches a preset residual threshold, outputting an inversion result, otherwise, entering step 7; and 7, updating the number of iterations, and returning to the step 4 to enter the next iteration until the iteration is ended. The method is applied to pre-stack seismic inversion, and can effectively and quickly simulate a complex seismic wave field of a reservoir with strong heterogeneity and a complex geological structure.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, in particular to a pre-stack seismic inversion method based on Rytov-WKBJ approximation. Background technique [0002] With the increasing demand for oil and natural gas worldwide, the direction of oil and gas exploration has gradually shifted from traditional simple structural oil and gas reservoirs to complex geological structural oil and gas reservoirs. [1] . Oil and gas reservoirs with complex geological structures often have strong heterogeneity and lateral discontinuity. At present, conventional seismic inversion algorithms are still mainly researched on reservoirs with relatively simple geological structures. Therefore, if such algorithms are used to predict reservoirs with relatively complex geological structures, it will cause deviations in structural and lithological predictions. For reservoirs with complex structures, due to the possible existence of faults, fractures, an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/36G01V1/28
CPCG01V1/307G01V1/362G01V1/282
Inventor 黄广谭
Owner ZHEJIANG UNIV
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