Method for obtaining saturability index of low porosity and low permeability reservoir

A saturation and reservoir technology, applied in the fields of earthwork drilling, instruments, measuring devices, etc., can solve the problem of not realizing the variable saturation index n that is calculated point by point

Active Publication Date: 2015-01-14
PETROCHINA CO LTD
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Problems solved by technology

[0018] In order to solve the problem that the existing technology does not realize the point-by-point calculation of the variable saturation index n according to the characteristics of the pore structure, the embodiment of the present invention provides a method for obtaining the saturation index of low-porosity and low-permeability reservoirs

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  • Method for obtaining saturability index of low porosity and low permeability reservoir
  • Method for obtaining saturability index of low porosity and low permeability reservoir
  • Method for obtaining saturability index of low porosity and low permeability reservoir

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[0076] see figure 1 , a method for obtaining the saturation index of a low-porosity and low-permeability reservoir, which is carried out according to the following steps:

[0077] Step 1: Select low-porosity and low-permeability core samples, carry out resistivity experimental research, obtain core sample water saturation and resistivity index, and use power function regression method by making cross-plot of water saturation and resistivity index of each core sample , to obtain the saturation index n of each core sample.

[0078] In the embodiment of the present invention, 20 low-porosity and low-permeability rock core samples from an oil field in the northwest region of China are selected for resistivity experiments, and the intersection diagram of water saturation and resistivity index of each rock core sample is as follows Figure 8 As shown in the figure, the X-axis is the saturation index n obtained from the core sample through the resistivity experiment.

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Abstract

The invention discloses a method for obtaining the saturability index of a low porosity and low permeability reservoir and belongs to the field of reservoir assessment. According to the method, the rock core nuclear magnetic resonance T2 spectrum, T2 geometric mean value, T2 cutoff value, rock core water saturation and rock core resistivity index are obtained through the nuclear magnetic resonance experiment and rock core resistivity experiment conducted on a rock core sample, and the computation model of the saturation index n of the low porosity and low permeability reservoir is established. By means of the establishment of the computation formula of the saturation index n of the low porosity and low permeability reservoir, the variable saturability index n, changing along with the pore structure, of the low porosity and low permeability reservoir can be obtained continuously and accurately.

Description

technical field [0001] The invention relates to the field of reservoir evaluation, in particular to a method for obtaining the saturation index of low-porosity and low-permeability reservoirs. Background technique [0002] Water saturation refers to the ratio of the pore volume occupied by water to the rock pore volume in the oil reservoir. Water saturation is a very important parameter in reservoir evaluation and reserve calculation. At present, the most direct and effective way to obtain reservoir water saturation is to use Archie's formula, combined with conventional logging porosity and resistivity to calculate water saturation. The water saturation calculation formula based on Archie's formula is as follows: [0003] [0004] In the formula, [0005] R w ---- Formation water resistivity, Ω.m; [0006] R t ----Oil-bearing rock resistivity, Ω.m; [0007] ----rock porosity, decimal; [0008] m ---- cementation index; [0009] S w ----water saturation, decima...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCG01N24/081G01N27/041
Inventor 杨华毛志强付金华肖亮石玉江李高仁程玉梅郭浩鹏周金昱王长胜汤宏平宋琛
Owner PETROCHINA CO LTD
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