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
CN103674811AActive Publication Date: 2014-03-26BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2014-03-26

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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.
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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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