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Fracture attribute factor extraction method and device based on shear wave birefringence

A birefringence and shear wave technology, applied in seismic signal processing and other directions, can solve the problems of difficult to achieve, difficult to obtain dual-source four-component data, and high acquisition cost, and achieve the effect of easy implementation, wide adaptability and strong robustness

Active Publication Date: 2018-08-07
CHINA PETROLEUM & CHEM CORP +1
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  • 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 acquisition method
This makes it difficult to obtain dual-source four-component data in actual seismic exploration
On the other hand, fast shear waves and slow shear waves are often mixed together to form elliptical polarization. The traditional polarization analysis method requires only one event in the analysis time window, which is difficult to meet.

Method used

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  • Fracture attribute factor extraction method and device based on shear wave birefringence
  • Fracture attribute factor extraction method and device based on shear wave birefringence
  • Fracture attribute factor extraction method and device based on shear wave birefringence

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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]

[0041] Among them, L is the length of the analysis time window, and the...

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]

[0065] where θ is the angle between the natural coordinate system and the observation coordinate system, which indicates the direction of fracture development, δ is the delay time between the fast shear wave and the slow shear wave after splitting, which indicates the density of fracture development, and L is the analysis time window length,

[0066] Among them, the expres...

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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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 陈蕾
Owner CHINA PETROLEUM & CHEM CORP
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