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《Journal of Northwest University(Natural Science Edition)》 2018-03
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The application of constant-rate mercury penetration technology of Chang 7 tight sandstone reservoir pore-throat space representation in Dingbian Oildom

ZHANG Peng;ZHANG Jingong;ZHAO Qianping;CHANG Bin;ZHANG Liang;GAO Fei;CAO Cheng;LI Kang;Department of Geology,Northwest University;Research Institute of Shaanxi Yanchang Petroleum(Group) Co.Ltd;  
In order to carry out characterization of Chang 7 tight sandstone reservoir pore-throat space representation in Dingbian Oildom,and the relationship between pore-throat space and reservoir physical property,the application of casting thin section,scanning electron microscope(SEM),constant-rate mercury penetration technology to carry out research on it. The results show that the pore types of Chang 7 dense sandstone reservoirs are mainly intergranular pores,intergranular pores,granular pores,micropores,and microfractures in the study area. The difference of pore radius of tight sandstone reservoir in the study area is not obvious,the distribution range is 65 ~ 240 μm,and the peak value is about 115 μm. The correlation between pore radiusand physical property is not significant. When the physical properties are good,the effective pore volume of the unit volume rock sample is larger,and the reservoir capacity is stronger. The distribution of throat radius is different with the permeability. When the permeability is less than 0. 50 × 10~(-3)μm~2,the range of the throat radius is narrower,the throat radius is less than 0. 9 μm,and the small throat is dominant and the change is more sensitive. When the permeability increases,the range of the throat radius gradually widens and the proportion of the large throat gradually increases. The correlation between the throat radius and physical properties is good,which is the key factor of reservoir property. With the increase of permeability,the contribution of the small throat to its permeability gradually decreased,and the contribution of the big throat gradually increased.The reservoir pore throat radius ratio is 10 ~ 1 250,and the distribution range is wide,which has adverse effect on the mining of reservoir.
【Fund】: 陕西省统筹创新基金资助项目(2016KTCL01-12);; 陕西省科技新星基金资助项目(2016KJXX-42)
【CateGory Index】: P618.13
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