Method, device and system for correcting measurement of nuclear magnetic resonance porosities

A nuclear magnetic resonance and porosity component technology, which is used in measurement devices, analysis by nuclear magnetic resonance, and analysis of suspensions and porous materials, etc. problem, to achieve the effect of improving the accuracy

Active Publication Date: 2014-03-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The NMR logging in the prior art often has measurement errors in some cases. For example, due to the influence of paramagnetic minerals and clay minerals in the rock, it often leads to a large difference between the porosity of the NMR logging and the po

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  • Method, device and system for correcting measurement of nuclear magnetic resonance porosities
  • Method, device and system for correcting measurement of nuclear magnetic resonance porosities
  • Method, device and system for correcting measurement of nuclear magnetic resonance porosities

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Embodiment Construction

[0031] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] An embodiment of the present invention provides a calibration method for NMR porosity measurement, such as figure 1 As shown, the method includes the following steps:

[0033] Step 101, obtaining a first mapping relationship among the transverse relaxation time, the first porosity component and the first porosity accumulation;

[0034] Among them, the transverse relaxation process of the sample is measured by the CPMG method, and the signal intensity is obtained as

[0035] M ( t ) = M ( 0 ) Σ n = 0 K ...

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Abstract

The invention relates to the field of well logging technology and discloses a method, device and system for correcting measurement of nuclear magnetic resonance porosities. A first mapping relation among transverse relaxation time, a first porosity component and first porosity cumulation is obtained, so that a second mapping relation between a capillary radius and the transverse relaxation time is obtained and further a third mapping relation between the capillary radius and a second porosity component is obtained; according to the first mapping relation, the second mapping relation and the third mapping relation, the corresponding relation between the first porosity component and the second porosity component is obtained, and the component ratio of the second porosity component to the first porosity component is calculated; according to the component ratio, the correction computation is performed on the measurement data of nuclear magnetic resonance porosities, so that the accuracy of the existing measurement of nuclear magnetic resonance porosities is improved.

Description

technical field [0001] The invention relates to the field of well logging technology, in particular to a calibration method, device and system for nuclear magnetic resonance porosity measurement. Background technique [0002] Nuclear magnetic resonance NMR logging is a new logging technology suitable for open-hole wells. It is currently a logging method that can directly measure the seepage volume characteristics of free fluid (oil, gas, water) in any lithological reservoir. It has obvious advantages. sex. NMR technology uses the paramagnetism of atomic nuclei and the external magnetic field interacting with them to achieve the purpose of well logging. In practical application, based on the interaction between hydrogen nuclei and external magnetic field, it can directly measure the characteristics of pore fluid without being affected by rock skeleton minerals, and can provide rich information, such as formation effective porosity, free fluid porosity, bound water porosity ...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N24/08
Inventor 令狐松姚军朋吴丰司马立强崔式涛张程恩
Owner BC P INC CHINA NAT PETROLEUM CORP
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