Method for measuring porosity of coal core

A technology of porosity and coal core, applied in measuring devices, suspension and porous material analysis, scientific instruments, etc., to achieve the effect of high detection accuracy and short time consumption
CN103018148AActive Publication Date: 2013-04-03CHINA UNIV OF GEOSCIENCES (BEIJING)
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF GEOSCIENCES (BEIJING)
Publication Date
2013-04-03

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Abstract

The invention discloses a method for measuring the porosity of a coal core. The method comprises the following steps of setting echo of measuring parameters of a low-field nuclear magnetic resonance instrument to be 0.10 microseconds; carrying out low-field nuclear magnetic resonance measurement on the saturated coal core after surface moisture is removed so as to obtain a spectrum T2 of transverse relaxation time of the saturated coal core; calculating an integral area of the spectrum T2of the saturated coal core in unit volume; and calculating to obtain a porosity value of the coal core through the integral area of the spectrum T2of the saturated coal core in the unit volume according to conversion relation established by an obtained preset standard sample. With the adoption of the method provided by the invention, the porosity of a core hole is reflected by a signal generated by moisture in a sample hole in a low-field nuclear magnetic resonance manner, so that the detection precision is high, and the consumed time is short.
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Description

technical field

[0001] The invention relates to the field of physical property measurement of coal reservoirs, in particular to a method for measuring the porosity of coal cores. Background technique

[0002] Coal core porosity is one of the important parameters in the study of coal reservoir physical properties. Most conventional tests use helium porosimeters. However, some coals are brittle and easily deformed or even broken under pressure. At the same time, the test of this method is cumbersome, and it is difficult to realize the application in the exploration field. Low-field NMR technology has become a hot spot for experimental exploration due to its fast and non-destructive advantages. Portable low-field NMR instruments are expected to realize the application of on-site mud logging, so as to realize timely on-site acquisition of reservoir physical parameters.

[0003] The reasonable setting of the parameters of the low-field NMR instrument is the necessary prerequisit...

Claims

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