Quantitative characterization of reservoir micro-pore structure based on digital core-a case study of Penglai 19-3 Oilfield in Bohai Sea
The deep understanding of reservoir micro rock pore structure is important for the long-term and efficient development of Bohai Oilfield.For Neogene Guantao Formation reservoir of Penglai 19-3 Oilfield in Bohai Sea,based on the understanding the reservoir physical properties and pore types,with the 3D dig-ital core analysis technology based on core CT scanning,the maximum sphere algorithm is used to complete the processing,segmentation and construction of the 3D pore network model.By extracting the characteristic parameters of the network model,the visual and quantitative characterization of the rock micro pore structure is realized,and then the numerical simulation method is used to analyze the seepage difference caused by different displacement directions of the core.The results show that:1)In the study area,the rock composi-tion exhibits a moderate level of maturity,poor sorting,and relatively weak diagenetic processes.The pre-dominant types of cementation include contact cementation and pore-filling cementation,indicating the overall characteristics of loosely packed sandstone;2)the reservoirs are mainly medium-high porosity and permeability,with large pore throat radius but poor pore throat sorting;the reservoir space is dominated by primary intergranular pores,supplemented by secondary dissolution pores;3)The micro pore throat charac-teristic parameters determine the macro physical properties of the reservoir.The higher the ratio of connect-ed large pore throats,the greater the contribution to the physical properties of the reservoir;4)Using the numerical simulation results,fluid displacement in the reservoir has obvious direction,and high-quality reservoirs are more susceptible to the influence of displacement direction.
PL19-3 OilfieldGuantao Formationdigital corepore structuredisplacement direction
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