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Method for measuring porosity of mud shale

A measurement method, mud shale technology, applied in the direction of measuring devices, suspension and porous material analysis, scientific instruments, etc., to achieve the effect of eliminating adsorption

Active Publication Date: 2011-11-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to overcome the shortcoming of using sandstone porosity measuring method to measure mud shale porosity in the prior art, and provide a kind of mud shale porosity measuring method for mud shale

Method used

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  • Method for measuring porosity of mud shale
  • Method for measuring porosity of mud shale
  • Method for measuring porosity of mud shale

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Follow the steps below to measure the porosity of shale:

[0031] Step (1): Select a certain amount of the whole sample to be tested, and measure the mass M O (200g), measure the total block volume V O (89.69cm 3 ) (total volume using methods including Archimedes (buoyancy) mercury immersion, mercury displacement, caliper measurement, Archimedes (buoyancy) with fluid other than mercury). Calculate the bulk density ρ of shale by formula (1) b (2.23g / cm 3 ).

[0032] Step (2): Pulverize the sample to pass through a 12-mesh sieve, and take a certain amount of M 1 (100g).

[0033] Step (3): Distill and extract the sample taken out (using Dean-Stark extraction device), take the solvent toluene until the water production remains stable, and record the volume V of the extracted water w (0.17cm 3 ).

[0034] Step (4): The sample extracted by distillation is taken out and dried at a constant temperature of 110°C. until the sample quality stabilized. Record the sample ...

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Abstract

The invention provides a method for measuring the porosity of mud shale. The method provided by the invention comprises the following steps: selecting a whole mud shale sample block to be detected; measuring the mass M0; measuring the total volume V0 of the block; computing the block density rhob of the mud shale; rhob=M0 / V0, grinding the sample; weighing a certain quantity M1 of the ground sample, wherein the M1 is less than or equal to the M0; distilling and extracting the weighed sample until the water yield is maintained to be stable; recording the volume Vw of the extracted water; taking out the distilled and extracted sample; drying until the mass is stable; recording the mass M2 of the sample; taking out the dried sample; measuring the volume Vg of particles; and computing the porosity phi of the sample, phi=(Vb-Vg) / Vg *100%, wherein Vb=M1 / rhob, the method provided by the invention can avoid inconvenience in drilling out the core of mud shale, eliminate the absorption of organic matters on measurement gases, avoid organic matters from blocking a pore throat, can measure non-communication pores before the mud shale is ground and can simultaneously determine the water saturation, oil saturation and gas saturation of the mud shale.

Description

technical field [0001] The invention relates to a method for measuring the porosity of mud shale, in particular to a method suitable for measuring the porosity of mud shale in a laboratory in the fields of petroleum, geology and mining. Background technique [0002] Currently, there is no specific method for determining the porosity of shale. [0003] However, if the conventional sandstone porosity measurement method is applied to the measurement of shale porosity, there are great limitations. It is mainly reflected in the following aspects: mud shale is easy to break and cores are not easy to drill, and the clay minerals in mud shale will expand during the core drilling process, which limits the measurement sample and affects the measurement accuracy; there is a large amount of organic matter in mud shale, which will affect the The test gas causes adsorption, which affects the measurement accuracy; the presence of organic matter in the shale will block the pore throat, res...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 田华张水昌柳少波
Owner PETROCHINA CO LTD
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