Nuclear magnetic resonance porosity correction method of igneous rocks and nuclear magnetic resonance T2 distribution correction method of igneous rocks

A technology of nuclear magnetic resonance and correction method, which is applied in the field of geological exploration, can solve the problem of inaccurate porosity of igneous rock nuclear magnetic resonance, and achieve the effect of improving accuracy

Inactive Publication Date: 2016-11-02
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

When analyzing igneous rock NMR, these paramagnetic minerals will affect the magnetic field, making the measured porosity of igneous rock NMR inaccurate
At the same time, the use of NMR T2 distribution to analyze rock pore structure will also bring great adverse effects

Method used

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  • Nuclear magnetic resonance porosity correction method of igneous rocks and nuclear magnetic resonance T2 distribution correction method of igneous rocks
  • Nuclear magnetic resonance porosity correction method of igneous rocks and nuclear magnetic resonance T2 distribution correction method of igneous rocks
  • Nuclear magnetic resonance porosity correction method of igneous rocks and nuclear magnetic resonance T2 distribution correction method of igneous rocks

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specific Embodiment

[0025] The applicant has performed nuclear magnetic resonance logging using the igneous rock nuclear magnetic resonance porosity correction method of the present invention. The test conditions are shown in Table 1. Well logging results see figure 2 and image 3 .

[0026] Table 1

[0027]

[0028] exist figure 2 Among them, reference numeral 21 is the porosity measurement result obtained by using the method of the prior art, reference numeral 22 is the porosity measurement result obtained by using the method of the present invention, and reference numeral 23 is the porosity obtained by using the core analysis measurement results. From figure 2 It can be clearly seen that, for optional depths between 900m and 920m, compared with the porosity obtained by the method of the prior art, the porosity obtained by the method of the present invention is comparable to that obtained by core analysis. The matching degree of porosity is better, which shows that the porosity mea...

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Abstract

The present invention relates to a nuclear magnetic resonance porosity correction method of igneous rocks and a nuclear magnetic resonance T2 distribution correction method of the igneous rocks. The method for measuring porosity in the igneous rocks includes the following steps that: step one, polarization correction is carried out on a plurality of original echo amplitudes ai obtained by nuclear magnetic resonance, and a plurality of corrected echo amplitudes bi are obtained, wherein i a serial number, the value of i being 1, 2, 3... m; and step two, a plurality of component porosity values pj of the igneous rocks are obtained through calculation according to an echo equation set and the plurality of echo amplitudes bi, wherein j is a serial number, and the value of j being 1, 2, 3... n, and the sum of the plurality of component porosity values pj is the total porosity of the igneous rocks. According to the nuclear magnetic resonance porosity correction method of the igneous rocks of the invention, adverse effects on a nuclear magnetic resonance analysis process, brought about by paramagnetic minerals, are fully considered, and therefore, the accuracy of analysis results is greatly improved.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a method for correcting the porosity of nuclear magnetic resonance of igneous rocks, and also relates to a method for correcting T2 distribution of nuclear magnetic resonance. Background technique [0002] In the prior art, nuclear magnetic resonance techniques are usually used to analyze the porosity of rocks. For example, in clastic rock formations, precise porosity independent of lithology can be obtained by NMR spectroscopy. However, igneous rocks often contain paramagnetic minerals, such as those containing iron and / or manganese. When analyzing igneous rock NMR, these paramagnetic minerals will affect the magnetic field, making the measured porosity of igneous rock NMR inaccurate. At the same time, the use of NMR T2 distribution to analyze rock pore structure will also bring great adverse effects. Contents of the invention [0003] In view of the above problems, th...

Claims

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Application Information

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IPC IPC(8): G01V3/38G01V3/14
CPCG01V3/14G01V3/38
Inventor 谭茂金毛克宇王琨宋晓东马雪团
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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