A Calculation Method of Tight Sandstone Permeability Based on NMR Double Cutoff

A technology of nuclear magnetic resonance and compact sandstone, which is applied in the fields of nuclear magnetic resonance analysis, permeability/surface area analysis, material analysis through resonance, etc., can solve problems that are difficult to popularize, and achieve the effect of accurate calculation

Inactive Publication Date: 2018-10-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, these methods rely too much on petrophysical data, and the models built are obviously regional, and it is difficult to extend to other blocks
In addition, due to the essential difference between the pore-throat distribution obtained by capillary pressure and the pore distribution obtained by nuclear magnetic resonance, the existing improved model also has major theoretical flaws

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  • A Calculation Method of Tight Sandstone Permeability Based on NMR Double Cutoff
  • A Calculation Method of Tight Sandstone Permeability Based on NMR Double Cutoff
  • A Calculation Method of Tight Sandstone Permeability Based on NMR Double Cutoff

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[0037] The present invention establishes a method for calculating the permeability of tight sandstone based on double cut-off values ​​of nuclear magnetic resonance. By measuring the nuclear magnetic resonance attenuation curves of tight sandstone in the state of complete water and irreducible water, they are inverted into T 2 Spectrum. Comparing the NMR T in the two states 2 Spectral morphology to determine NMR cutoffs for absolutely mobile and absolutely immobile water. On this basis, the relationship between absolute movable water content, absolute immovable water content and permeability is analyzed, and then a permeability model based on double cut-off values ​​of nuclear magnetic resonance is established to improve the prediction accuracy of tight sandstone permeability.

[0038] A method for calculating the permeability of tight sandstone based on double cut-off values ​​of nuclear magnetic resonance, specifically comprising the following steps:

[0039] 1.1 Core dril...

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Abstract

The invention discloses a method for calculating the permeability of tight sandstone based on nuclear magnetic resonance double cut-off values. By measuring the nuclear magnetic resonance attenuation curves of tight sandstone in the state of complete water and irreducible water, they are inverted into T2 spectrum, and the two states are compared. Under the NMR T2 spectrum, determine the NMR cut-off values ​​for absolutely mobile water and absolutely immovable water. On this basis, the relationship between absolute movable water content, absolute immovable water content and permeability is analyzed, and a permeability model based on double cut-off values ​​of nuclear magnetic resonance is established. The invention fully considers the contribution of different pore components to seepage, and improves the prediction accuracy of tight sandstone permeability.

Description

technical field [0001] The invention belongs to the field of geophysical well logging, and in particular relates to a method for calculating the permeability of tight sandstone based on nuclear magnetic resonance double cut-off values. Background technique [0002] Since its development, nuclear magnetic resonance technology has been widely used in various fields of geophysics and geological research, and has become an important method to characterize reservoir microscopic pore structure, fluid properties and physical property parameters, and has achieved good application results in conventional reservoir evaluation. [0003] As a key parameter of reservoir evaluation, permeability plays a pivotal role in the exploration and development of oil and gas fields. At present, the method of calculating permeability with NMR data is mainly based on Timur-Coates formula and SDR model, by selecting NMR T 2 The cut-off value separates the mobile fluid from the bound fluid to obtain t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N24/08
CPCG01N15/082G01N24/081Y02A90/30
Inventor 葛新民范宜仁刘建宇邢东辉邓少贵
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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