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Method using nuclear magnetic resonance to measure rock porosity

A technology of rock porosity and nuclear magnetic resonance, which is used in the analysis, measurement device, material analysis by resonance, etc. of using nuclear magnetic resonance, which can solve the problems of inaccurate evaluation, easy water loss, and high evaluation of irreducible water and small pore water. Achieve the effect that is conducive to research and accurate porosity value

Inactive Publication Date: 2016-06-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbonate rocks often have relatively large dissolved pores and caves due to dissolution, but conventional measurement methods often cannot accurately measure the pore system in the rock, because the water in the large pores is lost to the surrounding rock during the measurement process , resulting in overestimation of bound water and water in pores
[0003] In recent years, nuclear magnetic resonance instruments have become more and more popular in the measurement and analysis of rock pores. Rocks with relatively small pore diameters can be measured more accurately when they are saturated with water. The main problem is: after the rock with large pores is saturated with water, the water in the large pores is very easy to lose during the plastic film wrapping process, so that the final measured porosity is too small; during the NMR measurement process, The water in the large pores is easy to seep into the film, so that the proportion of small-diameter pores measured by nuclear magnetic resonance increases, and the proportion of large-diameter pores decreases, resulting in inaccurate evaluation of the pore structure of large pores by nuclear magnetic resonance.

Method used

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  • Method using nuclear magnetic resonance to measure rock porosity
  • Method using nuclear magnetic resonance to measure rock porosity
  • Method using nuclear magnetic resonance to measure rock porosity

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Use a core drilling sampling machine model YZ-1 to drill the rock with dissolved pores into a column with a diameter of 2.5cm, and then use a rock cutter to cut the cylindrical rock into a core column with a length of 5cm . Using chloroform as the extraction solvent, the core column was subjected to Soxhlet extraction for 36 hours, and then the core column was dried at 100°C until the chloroform volatilized.

[0031](2) The dissolution pores of the core column include large-diameter dissolution pores and small-diameter dissolution pores. Use tweezers to insert cotton into the large-diameter dissolution pores of the core column, and insert 0.02 g of cotton into the large-diameter dissolution pores with a pore diameter of 4 mm. Insert 0.03g of cotton into the large-diameter dissolution hole with a diameter of 6mm; insert 0.06g of cotton into the large-diameter dissolution hole with a diameter of 8mm; insert 0.08g of cotton into the large-diameter dissolution hole with...

Embodiment 2

[0036] (1) Drill the rock with dissolution holes into a column with a diameter of 2.5cm using a core drilling sampling machine model YZ-1, and then use a rock cutter to cut the cylindrical rock into a core with a length of 4.5cm column. Using chloroform as the extraction solvent, the core column was subjected to Soxhlet extraction for 24 hours, and then the core column was dried at 105°C until the chloroform volatilized.

[0037] (2) The dissolution pores of the core column include large-diameter dissolution pores and small-diameter dissolution pores. Use tweezers to insert cotton into the large-diameter dissolution pores of the core column, and insert 0.005 g of cotton into the large-diameter dissolution pores with a pore diameter of 2 mm. Insert 0.02g of cotton into the large-diameter dissolution hole with a diameter of 4mm; insert 0.03g of cotton into the large-diameter dissolution hole with a diameter of 6mm; insert 0.06g of cotton into the large-diameter dissolution hole ...

Embodiment 3

[0042] (1) Use a core drilling and sampling machine model YZ-1 to drill the rock with dissolved pores into a column with a diameter of 2.5cm, and then use a rock cutter to cut the cylindrical rock into a core with a length of 4.7cm column. Using chloroform as the extraction solvent, the core column was subjected to Soxhlet extraction for 48 hours, and then the core column was dried at 102°C until the chloroform volatilized.

[0043] (2) The dissolution pores of the core column include large-diameter dissolution pores and small-diameter dissolution pores. Use tweezers to insert cotton into the large-diameter dissolution pores of the core column, and insert 0.01 g of cotton into the large-diameter dissolution pores with a pore diameter of 3 mm. Insert 0.02g of cotton into the large-diameter dissolution hole with a diameter of 5mm; insert 0.04g of cotton into the large-diameter dissolution hole with a diameter of 7mm; insert 0.07g of cotton into the large-diameter dissolution hol...

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Abstract

A method using nuclear magnetic resonance to measure rock porosity includes: machining rock with dissolution pores into a core column, and removing organic substances attaching to the core column; filling the dissolution pores of the core column with flexible water-absorption substances; submerging the core column into water under the pressure of 2-5MPa for 24-72 hours; taking out the core column, removing the water on the surface of the core column, and using a film to wrap the core column; performing a nuclear magnetic resonance experiment on the core column to obtain the porosity. The method has the advantages that the water-absorption substances are used to fill the dissolution pores of the rock so as to constrain the water in the dissolution pores, the water in the dissolution pores does not flow out of the dissolution pores during the nuclear magnetic resonance experiment, and the measured rock porosity is accurate.

Description

technical field [0001] The invention relates to the technical field of rock analysis, in particular to a method for measuring rock porosity by nuclear magnetic resonance. Background technique [0002] NMR measurement of rock porosity is to measure the nuclear magnetic relaxation signal of hydrogen-containing fluid in rock pores, and finally obtain rock pore structure and total porosity through the response of hydrogen ions in pores of different sizes. Carbonate rocks often have relatively large dissolved pores and caves due to dissolution, but conventional measurement methods often cannot accurately measure the pore system in the rock, because the water in the large pores is lost to the surrounding rock during the measurement process , resulting in an overestimation of bound water and water in pores. [0003] In recent years, nuclear magnetic resonance instruments have become more and more popular in the measurement and analysis of rock pores. Rocks with relatively small po...

Claims

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Application Information

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IPC IPC(8): G01N24/08G01N15/08
CPCG01N15/088G01N24/081
Inventor 邹贤利陈世加谢冰路俊刚王力黄海李勇张焕旭马捷占盼
Owner SOUTHWEST PETROLEUM UNIV
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