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Stratum overpressure formation mechanism analyzing method

An analysis method and causal mechanism technology, applied in the fields of instruments, data processing applications, prediction, etc., can solve problems such as being affected by manual intervention and complex analysis process.

Inactive Publication Date: 2016-11-16
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] The purpose of the present invention is to provide an analysis method for the formation mechanism of overpressure in the formation, aiming at solving the problem that the analysis process of the existing abnormal overpressure analysis method in the formation is complex and affected by manual intervention

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  • Stratum overpressure formation mechanism analyzing method

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[0071] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0072] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0073] Such as figure 1 As shown, the analysis method of formation overpressure formation mechanism of the embodiment of the present invention comprises the following steps:

[0074] S101: selecting the mudstone target formation with low permeability as the analysis object;

[0075] S102: Select multiple normal compacted sections and use the equivalent depth method to calculate the pressure value (predicted value) of the target interval, and calculate the root mean square error betwe...

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Abstract

The invention discloses a stratum overpressure formation mechanism analyzing method. A single well is adopted to actually measure stratum pressure, the stratum pressure prediction method and the stratum overpressure formation mechanism are combined, and by comparing differences among different pressure prediction curves and differences between prediction curves and an actual measurement curve, the stratum overpressure formation mechanism is analyzed. The invention adopts three stratum pressure prediction methods, namely, the Eaton method based on undercompaction formation, the equivalent depth method and the Bowers method based on fluid expansion formation. The invention analyzes the stratum overpressure formation mechanism by comparing the differences among different pressure prediction curves and the differences between prediction curves and the actual measurement curve, the analysis process is simple, influences of artificial intervention are few, and the prediction result is more reliable.

Description

technical field [0001] The invention belongs to the technical field of overpressure formation mechanism analysis, and in particular relates to an analysis method for formation overpressure formation mechanism. Background technique [0002] Formation abnormal overpressure is closely related to the distribution of oil and gas reservoirs. Accurate analysis of the formation mechanism of abnormal formation overpressure is the key to accurate formation pressure prediction. In low-permeability mudstone formations, the formation mechanism of formation overpressure can be divided into three categories: undercompaction overpressure, fluid volume expansion overpressure, and structural extrusion overpressure. The combination increases the difficulty of formation pressure prediction. At present, the commonly used method for analyzing the cause of overpressure is mainly the attribute crossplot method. For example, Bowers (2002) proposed a method for judging the cause of undercompaction a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 熊晓军刘阳简世凯李翔
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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