A method for determining the pore size distribution of tight reservoirs based on mercury injection-nitrogen adsorption joint measurement data
A technology for pore size distribution and data determination, which is applied to the analysis of suspensions and porous materials, measurement devices, and analysis materials, etc., which can solve the problems of narrow pore size distribution in reservoirs, inability to observe the pore size distribution directly, and improve the overall and The effect of accuracy
Inactive Publication Date: 2019-10-25
NORTHEAST GASOLINEEUM UNIV
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[0004] The purpose of the present invention is to overcome the problem of narrow reservoir pore size distribution in the prior art and the inability to visually observe the pore size distribution, and to provide a method for determining the pore size distribution of tight reservoirs based on mercury injection-nitrogen adsorption joint measurement data, Unifying the range of pore size distribution obtained by the joint measurement of mercury intrusion and nitrogen adsorption methods can realize the final determination of the full range of pore size distribution in tight reservoirs by analyzing the characteristics of the pore size distribution of the mercury injection and nitrogen adsorption data of the reservoir. Features, with the characteristics of simple operation, strong visibility and high accuracy
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[0039] A specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.
[0040] see figure 1 , an embodiment of the present invention provides a method for determining the pore size distribution of tight reservoirs based on mercury injection-nitrogen adsorption joint measurement data, including the following steps:
[0041] Step (1), determine the nitrogen adsorption parameters of the pore size range that the nitrogen adsorption method can detect, use n 1 Indicates the total number of pore diameters measured by the nitrogen adsorption method, R i Indicates the size of the i-th aperture, α i Indicates the frequency occupied by the i-th aperture, X i Indicates the volume occupied by the i-th aperture, V 1Indicates the total pore volume measured by nitrogen adsorption method, i=1,2,…n 1 .
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Abstract
The invention discloses a method for determining the pore size distribution of tight reservoirs based on mercury injection-nitrogen adsorption joint measurement data. Firstly, the nitrogen adsorption method is used to obtain the pore size distribution of the reservoir, and the pore throat distribution measured by nitrogen adsorption is medium The distribution of pores or micropores; secondly, the mercury intrusion method is used to obtain the pore size distribution in the reservoir, and the pore throat distribution measured by the mercury intrusion method is mesopore or macropore; Throat distribution is redistributed, and the proportion of pore diameters in each interval is calculated, and then the pore size distribution of the whole range is obtained. The invention solves the problem of pore-throat distribution at different levels in tight oil and gas reservoirs, realizes the overall analysis of the distribution characteristics of pore-throat structures in the reservoir, thereby improving the integrity and accuracy of the microscopic pore structure characterization of tight reservoirs.
Description
technical field [0001] The invention belongs to the field of petroleum and natural gas exploration and development, and relates to a research method for the distribution of full pore diameters of reservoirs, in particular to a method for determining the distribution of pore diameters of tight reservoirs based on mercury injection-nitrogen adsorption joint measurement data. Background technique [0002] With the continuous development of oil and gas exploration, the observation and description methods of the microscopic pore throat structure characteristics of tight reservoirs are becoming more and more abundant. From the traditional mercury injection analysis combined with microscope observation, to CT three-dimensional pore simulation technology, Research is increasingly integrated with mathematics and computers, and tends to be quantitative. [0003] In the existing research methods of reservoir pore size distribution, due to the different principles of different measureme...
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IPC IPC(8): G01N15/08
CPCG01N15/088G01N15/0886
Inventor 张云峰臧起彪李易霖姜美玲孙博曹思佳
Owner NORTHEAST GASOLINEEUM UNIV