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A Method of Calculating Pressure Decay Gradient

A technology of attenuation gradient and pressure calculation, applied in the field of oil and gas exploration, can solve problems such as weak pressure attenuation gradient

Active Publication Date: 2020-10-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in terms of the expression of overpressure, the research on the pressure decay gradient is relatively weak

Method used

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  • A Method of Calculating Pressure Decay Gradient

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Embodiment Construction

[0063] In the following, the present invention will be specifically described through exemplary embodiments. It should be understood, however, that elements, structures and characteristics of one embodiment may be beneficially incorporated in other embodiments without further recitation.

[0064] see figure 1 , the present invention discloses a method for calculating the pressure decay gradient, the specific steps of which are:

[0065] S1. Data collection and collation

[0066] Collect and sort out the geological data, well logging data, mud logging data and oil testing data of the research area. The geological data include stratum stratification data, measured pressure data and sedimentary structure characteristics.

[0067] S2. Forecast formation pressure

[0068] The mudstone pressure in the study area was predicted by the Eaton method and the equivalent depth method, and corrected by the measured pressure.

[0069] S3. Draw pressure coefficient contour lines

[0070]...

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Abstract

The invention relates to a method for calculating the pressure attenuation gradient. The specific steps are: S1. Collect and organize geological data, mud logging data, well logging data and oil testing data in the research area. S2. Use the Eaton method and the equivalent depth method to predict the mudstone pressure in the study area, and use the measured pressure to correct it. S3. According to the predicted formation pressure value, combined with the study area's geological structure, sedimentary facies distribution characteristics and fault development, the pressure coefficient contour is drawn. S4. Establishing different pressure attenuation gradient calculation models, and calculating the pressure attenuation gradient according to the different pressure attenuation gradient calculation models. The present invention considers sedimentary facies change and fault geological factors, fully considers the inhomogeneity of pressure during the change process, and calculates the pressure attenuation gradient in the study area by establishing different pressure attenuation gradient calculation models to accurately determine the pressure attenuation Gradient distribution and its changing rules are beneficial to guide oil and gas exploration in overpressured oil-gas-bearing basins.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and relates to an overpressure calculation technique for oil and gas basins, in particular to a method for calculating pressure attenuation gradients. Background technique [0002] Overpressure is the main power source for oil and gas enrichment in petroleum basins. Overpressure is not only an important dynamic condition for oil and gas migration, but the fractures generated by it can also improve the channel of oil and gas migration, thus affecting the migration direction and spatial distribution of oil and gas in oil and gas basins. At present, the indicators of overpressure as dynamic characterization mainly include pressure coefficient, residual pressure and pressure gradient, among which pressure coefficient and residual pressure are widely used. Pressure coefficient, residual pressure and pressure gradient have certain differences in expression and practical meaning. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L11/00G01V9/00
CPCG01L11/00G01V9/00
Inventor 刘华冯月琳宋国奇袁飞飞李君蒋子月
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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