Nuclear magnetic resonance T2 cut-off value calculation method based on longitudinal wave constraint

A technology of nuclear magnetic resonance and calculation methods, which is applied in the direction of analysis by nuclear magnetic resonance, material analysis through resonance, and measuring devices, can solve problems such as error transmission, and achieve the effects of speeding up the progress of experiments, solving error transmission, and facilitating applications

Inactive Publication Date: 2016-08-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] In order to overcome the traditional method of giving NMR T 2 The problem of error transmission caused by the calculation of the cut-off value, the present invention provides a nuclear magnetic resonance T 2 Cutoff value calculation method

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  • Nuclear magnetic resonance T2 cut-off value calculation method based on longitudinal wave constraint
  • Nuclear magnetic resonance T2 cut-off value calculation method based on longitudinal wave constraint
  • Nuclear magnetic resonance T2 cut-off value calculation method based on longitudinal wave constraint

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Embodiment Construction

[0031] The invention relates to a nuclear magnetic resonance T based on longitudinal wave confinement 2 cut-off value calculation method, such as figure 1 As shown, including pretreatments such as core cutting, grinding and drying, the NMR T in the saturated state of the core 2 Spectrum and P-wave velocity measurement, nuclear magnetic resonance T under the centrifuged state of the core 2 Spectroscopy, NMR T 2 Cutoff value influencing factors analysis and modeling steps.

[0032] The present invention will be further described below in conjunction with accompanying drawing:

[0033] A NMR T based on longitudinal wave confinement 2 The calculation method of the cut-off value comprises the following steps:

[0034] a. Carry out pretreatments such as cutting and grinding on the sample obtained at the well site, and obtain a cylindrical core with a length of 3-5 cm and a diameter of 2.54 cm; put the core into a constant temperature box and dry it for 48 hours. Set to 100 deg...

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Abstract

The invention discloses a nuclear magnetic resonance T2 cut-off value calculation method based on longitudinal wave constraint. The method mainly comprises procedures of core cutting, polishing, drying and other pretreatment, nuclear magnetic resonance T2 spectrum and longitudinal wave speed measuring at a core saturation state, nuclear magnetic resonance T2 spectrum measuring at a core centrifugation state, and nuclear magnetic resonance T2 cut-off value influence factor analysis and modeling. The established T2 cut-off value calculation method is only related to the longitudinal wave speed and nuclear magnetic resonance porosity, indeterminacy of calculation is lowered to the maximum extent, the problem of propagation of error in a traditional calculation method is effectively solved, great convenience is brought to application for engineering and technological researchers, the measuring cost is saved, and the experiment schedule is accelerated.

Description

technical field [0001] The invention relates to a nuclear magnetic resonance T based on longitudinal wave confinement 2 The invention discloses a cutoff value calculation method, which belongs to the fields of rock physics and nuclear magnetic resonance. Background technique [0002] Core NMR and NMR logging are important methods to study pore structure, classify pore types, calculate porosity, permeability, irreducible water saturation and fluid identification, but the calculation of these parameters largely depends on T 2 Choice of cutoff value. T 2 The cut-off value is an indicator parameter to distinguish movable fluid from immobile fluid, which is very important for the definition of fluid and pore components and permeability modeling. In the absence of core data, domestic and foreign scholars generally use 33ms and 92ms as the T of sandstone and carbonate rock, respectively. 2 cutoff value. However, more and more studies have shown that T 2 The cut-off value is n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/08G01N24/081
Inventor 葛新民范宜仁邢东辉邓少贵刘建宇王小龙顾定娜
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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