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Method for computing pressure attenuation gradients

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: 2018-11-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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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  • Method for computing pressure attenuation gradients
  • Method for computing pressure attenuation gradients
  • Method for computing pressure attenuation gradients

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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 computing pressure attenuation gradients. The method includes particular steps of S1, collecting and collating geological materials, mud logging materials, well logging materials and oil testing materials of research areas; S2, predicting mudstone pressures of the research areas by the aid of Eaton processes and equivalent depth processes and correcting the mudstone pressures by the aid of measured pressures; S3, combining geological structures, sedimentary facies distribution characteristics and fault development conditions of the research areas with oneanother according to predicted formation pressure values and drawing pressure coefficient contour lines; S4, building different pressure attenuation gradient computation models and computing the pressure attenuation gradients according to the different pressure attenuation gradient computation models. The method has the advantages that sedimentary facies change and fault geological factors are considered, the heterogeneity of pressures in change procedures is sufficiently considered, the different pressure attenuation gradient computation models are built, the pressure attenuation gradients ofthe research areas are computed piecewise, accordingly, distribution and change laws of the pressure attenuation gradients are accurately clear and definite, and the method is favorable for guiding oil and gas exploration on overpressure oil and 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 Applications(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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