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Tensional-shear fault activity evaluation method

An evaluation method and active technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of no evaluation method and so on

Active Publication Date: 2016-12-07
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

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Problems solved by technology

At present, there is no reasonable and effective evaluation method for torsional faults, which have both strike displacement and dip displacement.

Method used

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Embodiment Construction

[0021] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0022] Such as figure 1 as shown, figure 1 It is a flowchart of the evaluation method of the torsional fracture activity of the present invention.

[0023] In step 101, a target layer structure map is obtained through 3D seismic data and 3D velocity field data. Such as figure 2 As shown, in one embodiment, three-dimensional seismic data and velocity field data are used to interpret the isochronous structure of the T6 layer in the Gaoqing area to form an isochronous structural map. The time-depth conversion is carried out through the three-dimensional velocity field data, and the T6 iso-depth structural map is formed.

[0024] In step 102, using the structural map obtained in step 101, a cross section perpendicular to the strike of the fault is obt...

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Abstract

The invention provides a tensional-shear fault activity evaluation method, and the method comprises the steps: obtaining the structural map of a target layer through employing three-dimensional seismic data and speed field data; obtaining the direction of a fault layer on the target layer, building a two-dimensional profile perpendicular to the direction of the fault layer, and obtaining the true dip of the profile and the vertical fault displacement; obtaining the complementary angle of an inclined angle between the direction of a regional tension main force and the direction of the fault layer in the range of the target layer; building a space diagram of the corresponding relation between the equivalent points of the upper and lower plates of the target layer in a three-dimensional space, and obtaining the strike slip and the dip slip; obtaining the strike slip speed and the dip slip speed through employing the strike slip, the dip slip and the deposition time of the target layer; obtaining a tensional-shear coefficient through employing the ratio of the strike slip speed to the dip slip speed, so as to represent the features of the tensional-shear fault activity. The method provides an effective solution for the further evaluation of the tensional-shear fault activity, and lays a foundation for the application of the tensional-shear fault theory in oil-gas exploration.

Description

technical field [0001] The invention relates to the fields of structural geology and petroleum geology, in particular to an evaluation method for torsional fracture activity. Background technique [0002] Fault activity evaluation is mainly used in the direction of oil and gas transportation and accumulation in the field of oil and gas exploration, and also plays an important role in the study of the matching relationship between structure and sedimentation. At present, the evaluation methods of fault activity are different according to the nature of faults. The main evaluation methods for tensional faults are: growth index method, activity rate method, etc. The growth index method uses the ratio of the thickness of the descending wall to the thickness of the upwelling wall to represent the activity intensity of the fault in a certain depositional period. The disadvantage of this method is that it does not consider the role of depositional time in the evaluation of fault act...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6161G01V2210/6169G01V2210/624
Inventor 张伟忠高平张云银崔世凌张林徐元刚史士龙李晓晨亓亮曲志鹏
Owner CHINA PETROLEUM & CHEM CORP
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