Nuclear magnetism and resistivity combined inversion water saturation method based on new three-water model

A technology of joint inversion and water model, which is applied in the fields of electrical/magnetic detection for logging records, electronic magnetic resonance/NMR detection, water resource assessment, etc., which can solve the problems of not considering model parameters and influence , to achieve reliable water saturation results and good experimental results

Pending Publication Date: 2022-02-11
JILIN UNIV
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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides a method based on the new three-water model for joint inversion of water saturation by NMR and resistivity to solve the problem in the prior art that the influence of different pore size range differences on model parameters is not considered in volcanic rock reservoirs

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  • Nuclear magnetism and resistivity combined inversion water saturation method based on new three-water model
  • Nuclear magnetism and resistivity combined inversion water saturation method based on new three-water model
  • Nuclear magnetism and resistivity combined inversion water saturation method based on new three-water model

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Embodiment

[0048] as attached figure 1 And attached Figure 29 Shown:

[0049] The combined NMR and resistivity inversion method for water saturation based on the new three-water model includes the following steps:

[0050] 1) Establish a T2-I model suitable for volcanic rocks based on rock-electricity experiment data, NMR experiment data, the new Sanshui model and fractal theory;

[0051] T2-I model formula of the present invention is as attached figure 1 Shown:

[0052] where α is an index related to the pore radius size distribution and relaxation time, and bt is the conversion coefficient;

[0053] And its combination with Archie's formula can get the formula, as attached figure 2 , attached image 3 Shown:

[0054] Among them, Df is the fractal dimension of pores in porous media, nt is the relationship index between NMR T2 time and pore diameter, and n is the saturation index in Archie's formula;

[0055] 2), determine the boundary points of large pores, medium pores and sm...

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Abstract

The invention provides a nuclear magnetism and resistivity combined inversion water saturation method based on a new three-water model, and relates to the technical field of volcanic rock reservoir detection, and the method comprises the following steps: 1) building a T2-I model suitable for volcanic rock according to rock electricity experiment data, nuclear magnetism experiment data, the new three-water model and a fractal theory. According to the nuclear magnetism and resistivity combined inversion water saturation method based on the new three-water model, the influence of different aperture ranges on model parameters is considered, the fractal theory is introduced, the problem of solving related parameters in different aperture ranges is successfully solved, the calculated water saturation is closer to a real measured value, and the method has a good application effect in the volcanic reservoir, overcomes the defect that the water saturation of the volcanic reservoir is rarely researched in the previous research, and solves the problem that the influence of the difference of different aperture ranges on model parameters is not considered in the volcanic reservoir in the prior art.

Description

technical field [0001] The invention belongs to the technical field of volcanic rock reservoir detection, and more specifically relates to a combined nuclear magnetic and electrical resistivity inversion method for water saturation based on a new three-water model. Background technique [0002] At present, the determination of water saturation mainly adopts resistivity logging method, that is, by establishing the relationship between water saturation and resistivity-conductivity model, and then quantitatively explaining the oil and gas of reservoirs according to this model, and the conductivity model is determined Afterwards, the corresponding interpretation method is determined. Therefore, whether the conductivity model can correctly describe the relationship between resistivity and water saturation will directly affect the accuracy of quantitatively describing the oil and gas content of the reservoir. The level of resistivity reflects the properties of formation pore fluid...

Claims

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Application Information

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IPC IPC(8): G01V3/18G01V3/32G01V3/38
CPCG01V3/18G01V3/32G01V3/38Y02A90/30
Inventor 郭宇航潘保芝张丽华阿茹罕王欣茹张乃毓张鹏济
Owner JILIN UNIV
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