Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A porosity inversion method with improved 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 limited porosity prediction ability and poor lateral resolution of porosity inversion results

Active Publication Date: 2020-11-06
CHENGDU UNIVERSITY OF TECHNOLOGY
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A porosity inversion method with improved resolution
  • A porosity inversion method with improved resolution
  • A porosity inversion method with improved resolution

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com