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Quantitative assessment method of low-permeability limestone reservoir permeability

A quantitative evaluation, limestone technology, applied in the field of quantitative evaluation of reservoir permeability, to achieve the effect of good economy, high accuracy and cost saving

Active Publication Date: 2017-06-27
CNOOC TIANJIN BRANCH +1
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Problems solved by technology

Therefore, it is not feasible to calculate the permeability of low-permeability limestone reservoirs based on formula (1)

Method used

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  • Quantitative assessment method of low-permeability limestone reservoir permeability
  • Quantitative assessment method of low-permeability limestone reservoir permeability
  • Quantitative assessment method of low-permeability limestone reservoir permeability

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Experimental program
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Embodiment 1

[0066] Embodiment 1: Take the low-permeability limestone reservoir of well A in an oil field as an example.

[0067] 1) Based on the core samples of low-permeability limestone reservoirs at a certain depth in Well A of the oilfield, the NMR transverse relaxation time T 2 Through experimental analysis, the geometric mean value T of the transverse relaxation time of 12 low-permeability limestone core samples is obtained. 2gmlime The average value of is about 210ms (Table 1 and figure 2 ); while the geometric mean T of the transverse relaxation time of 45 sandstone core samples in other oil fields 2gmsand The average value of is about 32ms (Table 2 and figure 2 ).

[0068] Table 1 The geometric mean T of the transverse relaxation time of low-permeability limestone core samples 2gmlime

[0069] serial number lithology Porosity(%) T 2gmlime (ms)

1 limestone 10.35 104.74 2 limestone 10.81 72.54 3 limestone 11.26 233.53 4 limes...

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Abstract

The invention provides a quantitative assessment method of the low-permeability limestone reservoir permeability. The method comprises the following steps that firstly, a few of low-permeability limestone core samples at a certain depth of a stratum and a few of sandstone core samples under the similar porosity condition are tested to obtain a geometric mean value of transverse relaxation time; secondly, the ratio of the permeability of the low-permeability limestone core samples to the permeability of the sandstone core samples is calculated; thirdly, the porosity of the whole stratum is measured by means of a logging instrument; fourthly, according to the quantitative assessment model of the low-permeability limestone reservoir permeability, the low-permeability limestone reservoir permeability is obtained by calculation, and the quantitative assessment of the permeability of the low-permeability limestone reservoir in the whole well section is completed. According to the quantitative assessment method of the low-permeability limestone reservoir permeability, a simple and practical method is provided while the result is ensured to be accurate.

Description

technical field [0001] The invention relates to a quantitative evaluation method for reservoir permeability, in particular to a quantitative evaluation method for low permeability limestone reservoir permeability. Background technique [0002] In general, the calculation of reservoir permeability is mainly based on the high-precision functional relationship between porosity and permeability, and the porosity is used to establish the calculation formula of permeability. Therefore, the calculation formula of reservoir permeability can be expressed as: [0003] [0004] In the formula: K is the permeability, mD; is the porosity, decimal. [0005] However, in low-permeability limestone reservoirs, the high-precision functional relationship between porosity and permeability does not exist. Therefore, it is not feasible to calculate the permeability of low-permeability limestone reservoirs based on formula (1). [0006] In addition, based on nuclear magnetic logging data, ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q50/02
CPCG06F30/20G06Q50/02
Inventor 李雄炎秦瑞宝平海涛刘小梅魏丹
Owner CNOOC TIANJIN BRANCH
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