Shear wave birefringence-based fracture attribute factor extraction method and device

An extraction method, birefringence technology, applied in seismic signal processing, etc., can solve the problems of difficult to obtain dual-source four-component data, difficult to achieve, high acquisition cost, etc.

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has great limitations. First, the excitation of the shear wave source required for pure shear wave exploration requires a series of special requirements, which are difficult to achieve in field data acquisition; secondly, the acquisition cost required for shear wave exploration is much higher. Compared with the usual P-wave source excitation a

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
  • Shear wave birefringence-based fracture attribute factor extraction method and device
  • Shear wave birefringence-based fracture attribute factor extraction method and device
  • Shear wave birefringence-based fracture attribute factor extraction method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] figure 1 A method for extracting fracture property factors based on shear wave birefringence according to an embodiment of the present invention is shown, the method includes:

[0038] Step 101, obtaining the horizontal component data volume received by the multi-component detector, the horizontal component data volume includes the radial component data volume R(t) and the tangential component data volume T(t);

[0039] Step 102, get θ and δ that maximize the value σ(θ, δ) of the normalized cross-correlation sum function in the following formula (1), where θ is the angle between the natural coordinate system and the observed coordinate system, that is, the fracture development Direction and azimuth, which indicates the direction of fracture development, δ is the delay time between fast shear wave and slow shear wave after splitting, which indicates the density of fracture development:

[0040] σ ( θ , δ ) ...

Embodiment 2

[0052] figure 2 A method for extracting fracture attribute factors based on shear wave birefringence according to an embodiment of the present invention is shown. This embodiment also includes the following steps on the basis of embodiment 1:

[0053] Step 103, judging whether there is an underlying fractured layer, which can be observed from seismic records, if yes, go to step 104, if not, then the method ends.

[0054] Step 104, correct according to the following formula (5);

[0055] R down (t)=R(t)cosθ-T(t)sinθ (5)

[0056] T down (t)=R(t)sinθ+T(t)cosθ

[0057] where R down (t) and T down (t) represents the lower layer radial component data volume and the lower layer tangential component data volume, where the lower layer refers to the lower layer relative to the current layer where R(t) and T(t) are located, and then use the corrected R in step 104 down (t) and T down (t) Replace R(t) and T(t) in step 102, re-execute step 102 to obtain the fracture development d...

Embodiment 3

[0061] According to another embodiment of the present invention, a device for extracting fracture attribute factors based on shear wave birefringence is proposed, including:

[0062] means for obtaining a horizontal component data volume received by a multi-component geophone, said horizontal component data volume comprising a radial component data volume R(t) and a tangential component data volume T(t);

[0063] are used to obtain theta and δ that maximize the value σ(θ,δ) of the normalized cross-correlation sum function in the following formula, as components of the fracture property factor:

[0064] σ ( θ , δ ) = ∫ - π 2 π 2 ∫ - L 2 ...

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 a shear wave birefringence-based fracture attribute factor extraction method. The method includes the following steps that: horizontal component data volumes received by a multi-component detector are received, wherein the horizontal component data volumes include a radial component data volume R (t) and a tangential component data volume T(t); and theta and delta which make normalized cross-correlation and the value sigma (theta and delta) of a function are maximum are adopted as fracture attribute factors, wherein theta is an included angle between a natural coordinate system and an observation coordinate system and indicates a fracture development direction, and delta is delay time between fast shear waves and slow shear waves after fracturing, and indicates crack development density.

Description

technical field [0001] The invention belongs to the field of seismic data interpretation, in particular to a method and device for extracting fracture attribute factors based on shear wave birefringence. Background technique [0002] Fluid-filled fractures are widely distributed in the strata, and these fractures have good permeability. They are not only storage spaces for oil and gas, but also migration channels for oil and gas. Therefore, it is of great significance to study the properties of fractures. [0003] In regions with oriented vertical (or nearly vertical) fractures, splitting occurs when shear waves pass through fractured media. As a result, fast shear waves and slow shear waves are generated. The former is polarized parallel to the fracture and propagates at the speed of the rock medium; the latter is polarized perpendicular to the fracture, and its propagation speed is affected by the fracture filling. Therefore, the fast shear wave and the slow shear wave t...

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): G01V1/28
Inventor 陈蕾
Owner CHINA PETROLEUM & CHEM CORP
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