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A Method for Detecting the Development Degree of Fractures in Formation

A technology of fracture development and degree, which is applied in the direction of seismology and seismic signal processing for well logging records, which can solve the problem of large errors, insufficient sensitivity of formation fracture development, and the detection ability of formation fracture development degree cannot meet the needs of oilfield production And other issues

Active Publication Date: 2015-09-02
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0004] Existing technical methods can also obtain the azimuth anisotropy attribute of compressional wave seismic propagation through wide azimuth compressional wave seismic exploration to detect the direction and azimuth angle information of formation fractures. The analysis of azimuthal anisotropy attributes can only describe the development characteristics of reservoir fractures qualitatively or semi-quantitatively with large errors
[0005] In short, due to the limitation of the technical method itself, the existing technical means cannot detect the development degree of formation fractures to meet the production needs of the oil field.

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  • A Method for Detecting the Development Degree of Fractures in Formation
  • A Method for Detecting the Development Degree of Fractures in Formation
  • A Method for Detecting the Development Degree of Fractures in Formation

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Embodiment Construction

[0030] A method for detecting the degree of fracture development in a formation, said method comprising the following steps:

[0031] (1) According to the site terrain where the well to be observed is located, design a three-dimensional three-component VSP observation plan according to the following requirements: Refer to figure 2 As shown, the observation azimuth angle value α∈{α j,j＝1,2,......,M}, α j ∈[0,360), the M values ​​of α evenly divide the circumference into M equal parts. According to the requirements of observation accuracy, the value of M can be selected from the set {6, 8, 10, 12, 16, 18, 36} An appropriate value; the distance between the position G where the downhole three-component geophone is placed and the wellhead position O is z 0 m, z 0 The value of should be able to ensure the normal operation of the downhole three-component geophone and be as close as possible to the formation to be observed; the distance between the vibroseis position S and the wel...

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Abstract

The invention provides a method for detecting the development degree of formation fractures. The method is that a phenomenon of shear-wave splitting occurs when shear waves spread in facture development formation, the shear-wave splitting phenomenon results in that the waveform of shear-wave preliminary waves received by two horizontal components of a three-component geophone changes according to the development degree of the formation fractures, and the development degree of the formation fractures is quantitatively detected through calculating the cross-correlation error coefficient of the shear-wave preliminary waves, thereby providing reference data for reducing risks in exploration and development and improving the extraction efficiency of oil and gas reservoir.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, and is a method for calculating the ratio of the first arrival energy of a shear wave in a seismic wave field recorded by two horizontal components of a downhole three-component geophone in a three-dimensional three-component VSP, so as to measure the development degree of fractures in the formation. Analytical methods for quantitative detection. The invention is mainly applied in the field of seismic exploration, and provides formation fracture development degree information for the exploration and development of fractured oil and gas reservoirs, and provides reference data for reducing the risk of exploration and development and improving the exploitation efficiency of oil and gas reservoirs. Background technique [0002] In the three-dimensional three-component VSP seismic exploration data, when the shear wave vibrator is excited beside the well, the shear wave generated by the sou...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/40
Inventor 李向阳蔡志光撒振宇宋建军陈海峰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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