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Porosity inversion method for improving resolution

A technology of porosity inversion and porosity, applied in the direction of seismology, measuring devices, instruments, etc. for well logging records, which can solve the problems of poor lateral resolution of porosity inversion results and limited porosity prediction ability

Active Publication Date: 2020-04-28
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, this method has limited ability to predict porosity, and the lateral resolution of porosity inversion results is poor, especially for complex oil-bearing high-porosity sandstone reservoirs or carbonate reservoirs

Method used

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  • Porosity inversion method for improving resolution
  • Porosity inversion method for improving resolution
  • Porosity inversion method for improving resolution

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Embodiment

[0067] Example: refer to figure 1 As shown, it is a flow chart of the method of the present invention. Assuming that there are seismic data to be inverted, well logging reflection coefficient and well logging porosity, the flow process of using the simulated annealing algorithm to realize high-precision porosity inversion is as follows,

[0068] (1) Deduce the approximate expression of the fast compressional wave reflection coefficient vertically incident on the interface of fluid-containing porous media, and establish a direct quantitative relationship between porosity and seismic records based on rock physics theory;

[0069] (2) According to the relationship between porosity and seismic records, the nonlinear inversion objective function is constructed with the log porosity and log reflection coefficient as prior constraints;

[0070] (3) Calculating porosity adjustment parameters by using logging data information, given prior information such as constraint parameters, maxi...

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Abstract

The invention provides a porosity inversion method for improving resolution. The method comprises the steps: (1), deducing a fast longitudinal wave reflection coefficient approximate expression whichis vertically incident to a fluid-containing pore medium interface, and building a direct quantitative relation between porosity and a seismic record based on a rock physics theory; (2), constructinga nonlinear inversion objective function by taking the logging porosity and the logging reflection coefficient as prior constraints according to a relationship between the porosity and the seismic record; (3), calculating a porosity adjustment parameter by utilizing logging data information, and giving prior information such as a constraint parameter, a maximum inversion iteration frequency and aporosity initial solution; and (4), substituting the known parameters into the nonlinear inversion objective function, and realizing direct quantitative inversion of the porosity by utilizing a simulated annealing algorithm. The method has the advantages that the limitation that the traditional method depends on single-phase medium and equivalent medium theories is broken through, and the direct quantitative relation between the porosity and the seismic record is fundamentally established, so that the resolution of porosity inversion is improved.

Description

technical field [0001] The invention belongs to the technical field of seismic inversion of rock porosity, in particular to a porosity inversion method for improving resolution. Background technique [0002] Porosity is one of the important factors controlling the storage and transport of pore fluids in rocks or sedimentary bodies, which is defined as the ratio of the volume of pores in rocks to the total volume of rocks. The actual storage capacity of rock pores for hydrocarbons in reservoir prediction is defined as effective porosity. Porosity prediction plays an important role in lithology identification, fluid identification and reserve estimation of oil and gas reservoirs. [0003] Most of the existing porosity prediction methods are based on rock physics theory, using the equivalent medium idea as a bridge to establish the quantitative relationship between porosity and actual seismic data, and realize the indirect quantitative inversion and prediction of porosity. Ho...

Claims

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Application Information

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IPC IPC(8): G01V1/30G01V1/28G01V1/40
CPCG01V1/282G01V1/306G01V1/307G01V1/40
Inventor 周东勇文晓涛秦子雨李垒
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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