Formation pressure correction method based on curvature

A technology of formation pressure and correction method, applied in seismic signal processing and other directions, can solve problems such as the influence of calculated pressure values, inaccurate lithology judgment, errors, etc., to achieve easy-to-implement effects

Inactive Publication Date: 2018-01-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The dc index method belongs to the prediction while drilling, and the judgment of lithology is not accurate enough, and the calculated pressure value is also affected to a certain extent
In addition, the current formation pressure prediction technology based on 3D seismic data does not consider the influence of fault factors, so there is a certain error between the formation pressure results near the fault and the actual geological conditions

Method used

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  • Formation pressure correction method based on curvature
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Embodiment Construction

[0022] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0023] The exemplary embodiment of the present invention is based on the conventional three-dimensional formation pressure prediction data, and based on the curvature attribute and logging data, the formation pressure is corrected near the fault, and finally the three-dimensional formation pressure data that is more in line with the actual geological situation is obtained. The prediction result can be It is used in hot fields such as shale g...

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Abstract

The invention discloses a formation pressure correction method based on curvature. The method comprises the following steps: 1, a formation pressure 3D data volume P is acquired; 2, in view of a seismic interpretation horizon in the same range as the 3D data volume P, curvature attributes are extracted, and the curvature attributes are normalized as a contribution rate a of an extrusion structureto the formation pressure; 3, based on formation data, an extrusion structure stress function sigmaT is fit; and 4, a formation pressure 3D data volume PM after correction is calculated according to the following formula: PM=P+a.sigmaT. The curvature attributes are introduced during the formation pressure correction process, the contribution of the extrusion structure to the formation pressure canbe effectively reflected in the space, and a more accurate formation pressure prediction result can be acquired.

Description

technical field [0001] The invention relates to geophysical technology, in particular to a method for correcting formation pressure based on curvature. Background technique [0002] Obtaining accurate formation pressure distribution is the key to horizontal well fracturing technology, and it is also crucial for the development of shale gas. At present, the methods used for formation pressure prediction, monitoring and detection mainly include geological analysis method, seismic method, dc index method and well logging method, etc. Both the geological analysis method and the seismic method belong to the pre-drilling prediction, and can be used to macroscopically delineate the abnormal pressure zone when the deep strata in the new area are surveyed and there is no drilling and logging data, but the accuracy is low. The dc index method belongs to the prediction while drilling, and the judgment of lithology is not accurate enough, and the calculated pressure value is also affec...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 张克非李呈呈朱童林正良胡华锋
Owner CHINA PETROLEUM & CHEM CORP
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