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Method for calculating tight sandstone reservoir permeability based on hole feature parameters

A technology for tight sandstone reservoirs and characteristic parameters, which is applied in the fields of calculation, special data processing applications, electrical digital data processing, etc., and can solve the problems of inability to accurately calculate permeability and low correlation coefficient.

Active Publication Date: 2013-09-04
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for calculating the permeability of tight sandstone reservoirs based on pore characteristic parameters, which can realize quantitative, continuous and high-precision pseudo-capillary measurement through NMR T2 spectrum without laboratory mercury injection data. The pressure curve, and finally calculate the reservoir permeability according to the pseudo-capillary pressure curve, so as to overcome the technical problems in the prior art that the correlation coefficient between the permeability and porosity analyzed by fitting the core is low, and the permeability cannot be accurately calculated

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  • Method for calculating tight sandstone reservoir permeability based on hole feature parameters
  • Method for calculating tight sandstone reservoir permeability based on hole feature parameters
  • Method for calculating tight sandstone reservoir permeability based on hole feature parameters

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Embodiment Construction

[0031] The specific implementation manners provided by the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] see Figure 1-11 , a method for calculating the permeability of tight sandstone reservoirs based on pore characteristic parameters provided by an embodiment of the present invention includes the following steps:

[0033] Step S101: Calculate the pore structure parameter 101 through the core mercury injection experiment;

[0034] Step S102: Construct characteristic function 1 through pore structure parameters, and then establish permeability logging interpretation model 102;

[0035] Step S103: Using NMR T 2 There is a correlation between the spectral distribution and the mercury injection pore size distribution, and the NMR T 2 Spectrum to pseudo-capillary pressure curve 103;

[0036] Step S104: According to the pseudo-capillary pressure curve, the characteristic function 2 identical to the characteri...

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Abstract

The invention discloses a method for calculating tight sandstone reservoir permeability based on hole feature parameters. The method includes the steps of calculating hole structural parameters through a rock core mercury penetration experiment, establishing a permeability well logging interpretation model through a first characteristic function which is established through the hole structural parameters, converting nuclear magnetism T2 spectrum into a pseudo capillary pressure curve through correlations existing between nuclear magnetism T2 spectrum distribution and mercury penetration hole diameter distribution, and calculating the reservoir permeability according to a second characteristic function which is established through the pseudo capillary pressure curve. In practical application, the quantitative, continuous and high-precision pseudo capillary pressure curve is obtained through nuclear magnetic resonance well logging information under the condition that laboratory mercury penetration information does not exist, and finally, calculation of the reservoir permeability is conducted according to the second characteristic function which is established through the pseudo capillary pressure curve.

Description

technical field [0001] The invention belongs to the technical field of well logging engineering, in particular to a method for calculating the permeability of tight sandstone reservoirs based on pore characteristic parameters. Background technique [0002] Reservoir permeability is an important parameter for reservoir evaluation, and accurate calculation of reservoir permeability is very critical in logging engineering. [0003] In the existing technology, regarding the calculation of permeability, for tight sandstone reservoirs, even if different sedimentary facies are considered, an empirical relationship is obtained by fitting the permeability and porosity of core analysis using traditional methods, and the correlation coefficient is not high , sometimes there is no correlation; nuclear magnetic resonance logging can provide useful information about the pore structure and its permeability, but for tight sandstone reservoirs, the correlation between the permeability calcul...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 成志刚罗少成林伟川张蕾席辉杨智新张泽文赵莉郑小敏李戈理
Owner BC P INC CHINA NAT PETROLEUM CORP
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