Method for determining contribution of pores with different apertures in shale reservoir stratum to porosity
A technology of porosity and mud shale, which is applied in petroleum, mining exploration and development, and geological fields. It can solve the problems that cannot be measured, and achieve the effect of accurate measurement and simple operation.
Inactive Publication Date: 2014-01-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
This method cannot effectively measure the pores in the shale sample with a pore size ranging from 100nm to 1000nm
At present, there is no method that can fully evaluate the contribution of pores of different pore sizes to porosity in shale reservoirs.
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Embodiment 1
[0022] Embodiment 1: as figure 1 Said, a method for determining the porosity contribution of pores with different pore sizes in shale reservoirs, comprising the following steps;
[0023] Step 1: Select three groups of parallel samples for shale reservoir samples at the same depth;
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Abstract
The invention discloses a method for determining contribution of pores with different apertures in a shale reservoir stratum to porosity, and belongs to the technical field of petroleum, geology and mining exploration and development. The method comprises the following steps: selecting three groups of parallel samples from shale reservoir stratum samples at the same depth; carrying out a low-temperature nitrogen adsorption-desorption experiment on the first group of samples to determine contribution of the pores with aperture ranging from 0.4-100 nm to the porosity; carrying out argon ion polishing and electron scanning microscope examination on the second group of samples to determine the contribution of the pores with aperture ranging from 50 nm to 3 microns to the porosity; carrying out mercury intrusion analysis on the third group of samples to determine the contribution of the pores with aperture greater than 1000 nm to the porosity; synthesizing the analytic data of the three groups of parallel samples, and obtaining the determination results of contribution of the pores with different apertures in the shale reservoir stratum to the porosity. The method can determine the contribution of the pores with different apertures in the shale reservoir stratum to the porosity, and overcomes the defect of the conventional gas adsorption method and the mercury intrusion method for determining the contribution of the pores with different apertures in the shale reservoir stratum to the porosity.
Description
technical field [0001] The invention relates to a method for measuring the contribution of pores with different diameters to the porosity of mud shale reservoirs, and belongs to the technical fields of petroleum, geological and mining exploration and development. Background technique [0002] Ultra-low porosity and ultra-low permeability mud shale can be used as shale oil and shale gas reservoirs, and the contribution of pores of different pore sizes in mud shale to porosity is an important physical property characteristic for evaluating mud shale reservoirs. In the exploration and development of shale oil and shale gas, clarifying the contribution of pores with different pore sizes to porosity in shale reservoirs can provide a basis for evaluating the occurrence, flow state and Admissibility, etc. provide the basis and basis. In terms of the determination of pore size distribution of shale samples, part 1 of GB / T21650-2008 "Measurement of Pore Size Distribution and Porosit...
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IPC IPC(8): G01N15/08
Inventor 陈方文丁雪卢双舫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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