Anisotropy parameter calculation method and device based on VVAZ and AVAZ joint inversion

By using the joint inversion method of VVAZ and AVAZ, the problem of difficulty in calculating the Schoberg anisotropy parameters ΔN and ΔT in existing technologies has been solved, and a refined description of reservoir characteristic parameters in seismic exploration has been achieved.

CN121763390APending Publication Date: 2026-03-31CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411372833.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-29
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing technologies make it difficult to directly calculate the Schoenberg anisotropy parameters ΔN and ΔT, which affects the refined description of reservoir characteristic parameters in seismic exploration.

Method used

The VVAZ and AVAZ joint inversion method was used to obtain five-dimensional pre-stack gathers by processing seismic data. Based on the VVAZ and AVAZ inversion results, the anisotropy parameter δ, anisotropic fracture parameters and P-wave/S-wave velocity ratio were calculated, and ΔN and ΔT were obtained.

Benefits of technology

It enables rapid calculation of Schoberg anisotropy parameters ΔN and ΔT, and can directly calculate reservoir characteristic parameters such as the rate of change of horizontal stress and fluid identification factor, thus constructing a refined five-dimensional seismic data description for different types of reservoirs.

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Abstract

The invention relates to the technical field of seismic exploration, and particularly discloses a VVAZ and AVAZ combined inversion anisotropy parameter calculation method and device, and the method comprises the steps: carrying out the VVAZ inversion of a five-dimensional pre-stack gather, and obtaining an anisotropy parameter delta; carrying out residual time difference correction on the five-dimensional pre-stack gather to obtain a corrected five-dimensional pre-stack gather; aVAZ inversion is carried out on the corrected five-dimensional pre-stack gather, and anisotropic fracture parameters are obtained; based on logging information of the work area, elastic parameter inversion is carried out on the corrected five-dimensional pre-stack gather, and the longitudinal and transverse wave velocity ratio of the work area is obtained; and solving anisotropy parameters delta N and delta T based on the anisotropy parameter delta, the anisotropy crack parameter and the longitudinal and transverse wave velocity ratio. According to the method, rapid solving of fracture anisotropy parameters deltaN and deltaT is achieved by utilizing the solving relation of anisotropy parameters of VVAZ and AVAZ and the relation among the Thomsen anisotropy parameter delta, the Schobergn anisotropy parameters deltaN and deltaT and the anisotropy gradient Bani.
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