Tight sandstone permeability computing method based on nuclear magnetic resonance double-stop value

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: 2017-03-15
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

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  • Tight sandstone permeability computing method based on nuclear magnetic resonance double-stop value
  • Tight sandstone permeability computing method based on nuclear magnetic resonance double-stop value
  • Tight sandstone permeability computing method based on nuclear magnetic resonance double-stop value

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[0037] The present invention establishes a tight sandstone permeability calculation method 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 bound water, and inverting them 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 drilling, cutting, grindi...

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Abstract

The invention discloses a tight sandstone permeability computing method based on a nuclear magnetic resonance double-stop value. T2 spectrums are inverted by measuring nuclear magnetic resonance decay curves of tight sandstone in completely water-containing and irreducible water conditions, the nuclear magnetic resonance T2 spectrums in the two conditions are contrasted, and nuclear magnetic resonance stop values of absolutely movable water and absolutely non-movable water are determined. On the basis, the relation among the content of absolutely movable water, the content of absolutely non-movable water and the permeability is analyzed, and a permeability model based on the nuclear magnetic resonance double-stop value is established. The method takes the contribution of different pore components for interstifial flows into full consideration, so that the permeability prediction accuracy of tight sandstone is improved.

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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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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