基于显微红外光谱技术的岩石微观渗流特性研究

doi:10.13722/j.cnki.jrme.2016.0526

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Abstract

The seepage characteristic of rock determines the efficiency of oil exploitation and it has important significance for the quantitative evaluation of reservoirs. In order to figure out the influence of the pores，cracks and different mediums in rocks on its seepage performances，spectral imaging experiment was carried out on rock sample by using the microscopic infrared spectral imaging technology. The rock section can be divided into pore and crack regions，transition regions of pore and rock medium，and dolomite medium regions according to the spectral image and absorbance value A. Based on this，a finite element model in which the real structures of the rock sample could be described precisely was established and numerical simulation researching the rock′s micro seepage characteristics was carried out. The results show that：(1) the spectral absorption band of the sample is at 2 500–2 700 cm^－¹，showing that the sample medium is mainly dolomite. (2) the greater the dynamic viscosity of the fluid in the two-dimensional flow of the same plane is，the smaller the flow rate of the fluid in the channel is. (3) When the permeability of porous dolomite medium is small，the fluid flow is mainly dominated by the free flow along the crack channels，and the seepage movement in rock medium is weak. With the increasing of the medium permeability，fluid seepage in porous medium is gradually obvious. When the pore throat size is small，the capillary resistance is big，and the fluid does not flow. (4) When the pore throat size is enlarged，the number of preferential flow path increases，the fluid flow range in the rock section increases，and the flow rate becomes large. The results can provide a scientific basis for the development of reservoir reconstruction project，so as to improve the efficiency of oil exploitation.

Key words：：rock mechanics micro infrared spectra imaging technology rocks medium seepage numerical simulation

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	Articles by authors
	LI Jing1
	PENG Chengle1
	ZHOU Hanguo2
	3
	GUO Jianchun3
	FAN Zuosong1
	WANG Chang1

Cite this article:

LI Jing1,PENG Chengle1,ZHOU Hanguo2, et al. Study on microscopic seepage characteristics of rock based on micro infrared spectra technology[J]. , 2017, 36(S1): 3184-3191.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0526 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3184

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