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A Thickness Prediction Method for Compressive Fault Zones in Covering Areas

A prediction method and fault zone technology, applied in the field of oil and gas exploration and development, can solve the problem of lack of effective methods for compressive fault zones, and achieve the effect of accurate prediction results

Active Publication Date: 2018-04-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0008] In short, the above methods are all aimed at the drilling area, and calculate the thickness of the fault zone through the corresponding characteristics of the well logging. However, there is still no effective method for predicting the thickness of the compressive fault zone in the non-drilling area.

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  • A Thickness Prediction Method for Compressive Fault Zones in Covering Areas
  • A Thickness Prediction Method for Compressive Fault Zones in Covering Areas
  • A Thickness Prediction Method for Compressive Fault Zones in Covering Areas

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Embodiment Construction

[0029] The specific embodiments of the present invention are described in detail below.

[0030] The method for predicting the thickness of the compressive fracture zone in the coverage area includes the following steps:

[0031] (1) Judge whether the stress environment in the work area is a compressive environment or a tensile environment. If it is a compressive stress environment, go to step (2);

[0032] (2) Interpret the seismic data at the location of the fault zone, identify the fault, and obtain the vertical stratum fault distance L; the method of obtaining the vertical stratum fault distance L is:

[0033] Fit the average seismic reflection velocity in the study area to obtain the comprehensive velocity according to the geological conditions and characteristics of the study area, and establish the time-depth conversion relationship:

[0034] h=a(e bt -1)

[0035] Where: h—depth, m;

[0036] t—Seismic reflection time, ms;

[0037] a, b—constant (reflecting the shape of the speed c...

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Abstract

The invention relates to a method for predicting the thickness of a compressive fault zone in the coverage area, comprising the following steps: selecting the stress environment of the work area as a compressive environment; interpreting the seismic data at the location of the compressive environment fault zone, identifying the fault, and obtaining the vertical Formation fault distance L; the thickness of the fault zone is calculated according to the formula H=kLd, where k and d are specific coefficients. The method for predicting the thickness of the compressive fault zone in the coverage area of ​​the present invention can identify faults and describe the fault distance through the fine interpretation of seismic data in the undrilled area or the area where no well drilled and encountered faults, and then use the thickness calculation formula to predict the fault zone Thickness, the present invention compares with the prior art (the thickness of the structural unit of the fault zone after the fault zone structure division of the well logging data is used to drill wells in the fault zone), the error produced by the two is less than 10%, and the prediction result is very accurate, therefore, The invention has great significance for developing faults to control reservoirs and selecting favorable oil and gas targets.

Description

Technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and specifically relates to a method for predicting the thickness of a pressure fracture zone in a coverage area. Background technique [0002] Fracture is a kind of structural deformation phenomenon in which a rock layer breaks under stress and produces obvious relative movement along the fracture surface. The rock layers on both sides of the fracture surface are squeezed and ground during the dislocation process, the rock is broken strongly, and a large number of fractures associated with the fault are generated on both sides of the rock (Song Daofu et al., 2010). Zhang Qinglian et al. (2010) found through field measurements that the density of structural fractures controlled by faults has an exponentially decreasing relationship with the distance from the fault. The closer to the fracture surface, the more the fractures develop. Billi A (2003) et al. d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 吴孔友郄润芝洪梅李思远吴智平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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