Azimuthal anisotropic elastic impedance based crack detection method

A technology of azimuthal anisotropy and elastic impedance, applied in the field of petroleum exploration, can solve problems such as unfavorable fracture prediction work, difficult to solve accurately, complicated equations, etc., and achieve the effect of improving application value, high coincidence degree, and strong noise resistance

Inactive Publication Date: 2014-08-27
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF2 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general algorithm will take the Thomsen-type anisotropic parameter system as the solution target, which will result in more complex equations and more parameters, which can achieve certain results in numerical models, but it is difficult to solve them accurately in practical applications
More importantly, in actu...

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
  • Azimuthal anisotropic elastic impedance based crack detection method
  • Azimuthal anisotropic elastic impedance based crack detection method
  • Azimuthal anisotropic elastic impedance based crack detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0043] figure 1 It is a flow chart of the fracture parameter inversion method based on azimuth anisotropic elastic impedance in the present invention: Step 1: Perform azimuth-based processing (including amplitude-preserving migration processing) on ​​seismic data, and extract azimuth-based common reflection points CRP (Common Reflection Point) gather;

[0044] Step 2: Obtain fracture parameters (fracture density B ani and fracture azimuth ф S ), combined with logging and petrophysical information, using the explicit relationship between fracture parameters and anisotropic elastic impedance EI(i, φ) deduced by the present invention, to fit the anisotropic elastic impedance under different azimuth gathers Logging constraint curve;

[0045] Step 3: Implement well-constrained sparse pulse inversion in Jason software to obtain the anisotropic elastic imped...

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 relates to an azimuthal anisotropic elastic impedance based crack detection method. With a Connolly elastic impedance equation and a Ruger equation serving as the basis, anisotropic elastic impedance and crack parameters and the dominance relation formula between crack density and crack azimuth are deduced. A set of elastic impedance based crack inversion process is established, and anisotropic parameter information is added into inversion well logging constraint. Numerical model testing is performed in the method, the inversion result is roughly identical to the theoretical value, and the inversion density shows high noise immunity. The method has the advantages that anisotropic elastic impedance can be used, the crack density and the crack azimuth are calculated simultaneously, good application effects are provided in actual data, and high practicality is provided.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, and relates to a method for detecting effective fractures by using the characteristics of elastic impedance azimuth anisotropy in the comprehensive evaluation of fractured reservoirs. Background technique [0002] Fractured reservoirs account for about one-third of the world's oil and gas reserves. As oil and gas migration pathways and storage spaces, detecting fractures is of great significance for finding oil and gas reservoirs. The study of fractures is also an important part of reservoir evaluation and prediction in today's era. The elastic impedance in the seismic wave has azimuthal anisotropy in fractured reservoirs, so this property can be used to detect fractures. In 1999, Connolly first proposed the concept of elastic impedance. He used the approximate reflection coefficient proposed by Aki & Richards to derive the elastic impedance formula in isotropic media (Connolly, 1999). Res...

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
IPC IPC(8): E21B49/00
Inventor 孙赞东尹冬晓张远银王招明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap