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A method of correcting the NMR porosity of igneous rocks using a chart

A nuclear magnetic resonance and igneous rock technology, which is applied in electron magnetic resonance/nuclear magnetic resonance detection, electrical/magnetic detection for well logging records, and re-radiation, can solve the problem of small nuclear magnetic resonance porosity values, etc. Achieve wide applicability, accurate calibration accuracy, and solve the effect of small values

Inactive Publication Date: 2019-03-19
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

Under the condition of known rock magnetic susceptibility and echo interval, the relative error of NMR porosity can be read by using this chart, and the porosity correction can be performed on the NMR measurement results according to the relative error, thus solving the problem of small NMR porosity value problem, which provides an important basis for the interpretation of formation NMR logging

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  • A method of correcting the NMR porosity of igneous rocks using a chart
  • A method of correcting the NMR porosity of igneous rocks using a chart
  • A method of correcting the NMR porosity of igneous rocks using a chart

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] A method for correcting the NMR porosity of igneous rocks using a plate according to the present invention comprises the following steps:

[0045] 1. Influencing factors of NMR

[0046] In NMR logging, NMR relaxation consists of three parts, namely surface relaxation, fluid bulk relaxation and diffusion relaxation.

[0047]

[0048]

[0049]

[0050] In the formula, T 2 is the transverse relaxation time, T 2S is the surface relaxation time, T 2B is the fluid body relaxation time, T 2D is the diffusion relaxation time, ρ 2 is the transverse surface relaxation rate, S / V is the void ratio surface, D is the diffusion coefficient, G is the magnetic field gradient, γ is the gyromagnetic ratio, T E is the echo interval, G external is the external magnetic field gradient, B 0 is the strength of the external magnetic field, r j is the distance...

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Abstract

The invention relates to a method for correcting nuclear magnetic resonance porosity of igneous rock by means of a plate. According to the method of the invention, the nuclear magnetic resonance porosity correction plates of different fluid components are obtained through performing analog computation on a large number of values, and a corresponding relative error can be searched by means of the nuclear magnetic resonance porosity correction plates. Under a precondition that fluid property, magnetic susptibility and echo interval in a rock are known, a corresponding relative error can be accurately and quickly obtained through reading the corresponding nuclear magnetic resonance porosity relative error correction plate. Then a nuclear magnetic resonance porosity measurement result is corrected, thereby obtaining the accurate nuclear magnetic resonance porosity. The method settles a problem of relatively small number of the nuclear magnetic resonance porosity and has advantages of high correction accuracy and relatively wide application range. The method supplies important basis for nuclear magnetic resonance logging interpretation of a stratum.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance logging, relates to a method for correcting the nuclear magnetic resonance porosity of igneous rocks, and provides a method for correcting the nuclear magnetic resonance porosity of igneous rocks using a plate. Background technique [0002] NMR logging is an important oil logging technology, which obtains the porosity of the rock by measuring the hydrogen in the rock. In sedimentary rocks, this technology can provide porosity independent of lithology, and use T2 distribution to study pore structure, which has obvious advantages compared with other porosity logging methods. [0003] However, in rocks such as igneous rocks, due to the existence of paramagnetic ions, the porosity obtained from nuclear magnetic resonance logging is seriously smaller than the conventional porosity of cores. In order to analyze the influencing factors, scholars at home and abroad have carried out a s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/32G01V3/38
CPCG01V3/32G01V3/38
Inventor 谭茂金毛克宇张晋言王鹏范璐娟杜欢
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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