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Method for predicting storage layer crack development parameters

A fracture development and parameter technology, applied in the field of petroleum geophysical exploration, can solve problems such as difficulty, poor prediction effect, and large difference in prediction results, and achieve the effect of good effect, accurate detection and accurate prediction

Active Publication Date: 2015-06-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, these conventional technical methods are quite difficult to implement, and are easily affected by various unfavorable factors in operation. There are mainly the following problems:
[0005] (1) Constrained by the use of well data for fracture prediction, the prediction effect is often not good in areas far from the well
[0006] (2) Using amplitude, frequency and other attributes to perform ellipse fitting to calculate the direction and strength of fracture development, the prediction results are often very different, and it is difficult to make choices about these technical methods and judge the impact on the results
[0007] (3) For the evaluation of micro-fracture development parameters, conventional techniques are often difficult to describe accurately

Method used

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  • Method for predicting storage layer crack development parameters
  • Method for predicting storage layer crack development parameters
  • Method for predicting storage layer crack development parameters

Examples

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Effect test

example 2

[0084] The second example is to predict the development direction and relative strength value of fractures by using the two-way travel time difference of a two-dimensional survey line using a certain laboratory data.

[0085] The azimuth angle of survey line 1 is 15°, the azimuth angle of survey line 2 is 60°, and the azimuth angle of survey line 4 is 150°. The model consists of a fractured gas-bearing sand and an azimuthally isotropic shale overburden, Figure 4 The two-way travel time values ​​and normalized values ​​of the three lines with an offset distance of 2000m can be seen to be significantly different. Figure 5 In order to use the normalized value to perform three-point ellipse fitting calculation, the fracture trend (short axis direction) is in good agreement with the actual fracture trend. Image 6 The seismic rose diagram designed for the fracture trend and relative intensity value predicted by the ellipse, it can be seen that the seismic rose diagram is clear a...

example 3

[0086] Example 3 is to use the two-way travel time difference of the two-dimensional survey line (survey line 1, survey line 3, survey line 4) for the actual data of a certain area of ​​the North Sea Oilfield (such as Figure 7 shown) to predict the direction of fracture development. Figure 8 The minor axis of the ellipse in is consistent with the actual fracture direction.

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Abstract

The invention provides a method for predicting storage layer crack development parameters, and belongs to the field of petroleum geophysics exploration. The method comprises the following steps that (1) earthquake data is input; (2) earthquake data with different azimuth angles is used for extracting a target layer two-way travel time value, the normalization processing is carried out, and the two-way travel time value of each target layer after the normalization processing is obtained; (3) an earthquake rose figure and an integral crack development intensity plane figure are respectively generated on each point on a set lattice, the two figures are laminated and are then displayed, and a crack parameter plane figure is obtained. When the method provided by the invention is used, a crack type storage layer can be accurately predicted.

Description

technical field [0001] The invention belongs to the field of petroleum geophysical exploration, in particular to a method for predicting reservoir fracture development parameters, belongs to the category of seismic data interpretation, and is a method for calculating reservoirs by using the two-way travel time values ​​of the target layers of seismic data at various azimuth angles Methods for Fracture Growth Parameters. Background technique [0002] Carbonate fractured reservoirs in southern China exploration areas are relatively well-developed. Specifically, in the Sichuan Basin, a large number of fractured gas reservoirs have been drilled and industrial gas flows have been obtained. These fractured carbonate reservoirs are basically formed under the action of tectonic stress, have very strong heterogeneity, and are unevenly distributed on the plane, making exploration and development very difficult. How to identify fractured reservoirs as One of the key points of geophysi...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 胡伟光谢红斌印峰何鑫杨鸿飞赵卓男肖伟
Owner CHINA PETROLEUM & CHEM CORP
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