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microscopic characteristics of tight sandstone reservoirs and their effects on the imbibition efficiency of fracturing fluids:A case study of the Linxing area,Ordos Basin

引用

Energy Geoscience 2024年第3期5卷 328-338页

作者： Qihui Li Dazhong Ren Hu Wang Haipeng Sun Tian Li Hanpeng Zhang Zhen Yan Rongjun Zhang Le Qu Engineering Research Center of Development and Management for Low to Ultra-Low Permeability Oil&Gas reservoirs in West China(Ministry of Education) College of Petroleum EngineeringXi'an Shiyou UniversityXi'anShaanxi710065China No.6 Gas Production Plant PetroChina Changqing Oilfield CompanyYan‘anShaanxi716000China No.4 Oil Production Plant PetroChina Changqing Oilfield CompanyXi'anShaanxi710021China Engineering Technology Branch CNOOC Energy Development Co.Ltd.Tianjin300452China Xi'an Key Laboratory of Tight Oil(Shale Oil)Development Xi‘an Shiyou UniversityXi'anShaanxi710065China

The Linxing area within the Ordos Basin exhibits pronounced reservoir heterogeneity and intricate micro-pore structures,rendering it susceptible to water-blocking damage during imbibition *** study delved into the traits of tight sandstone reservoirs in the 8th member of the Shihezi Formation(also referred to as the He 8 Member)in the study area,as well as their effects on fracturing fluid *** experimental techniques such as nuclear magnetic resonance(NMR),high-pressure mercury intrusion(HPMI),and gas adsorption,this study elucidated the reservoir characteristics and examined the factors affecting the imbibition through imbibition *** findings reveal that:①The reservoir,with average porosity of 8.40%and average permeability of 0.642×10^(-3)μm^(2),consists principally of quartz,feldspar,and lithic fragments,with feldspathic litharenite serving as the primary rock type and illite as the chief clay mineral;②Nano-scale micro-pores and throats dominate the reservoir,with dissolution pores and intercrystalline pores serving as predominant pore types,exhibiting relatively high pore connectivity;③Imbibition efficiency is influenced by petrophysical properties,clay mineral content,and microscopic pore *** to the heterogeneity of the tight sandstone reservoir,microscopic factors have a more significant impact on the imbibition efficiency of fracturing fluids;④A comparative analysis shows that average pore size correlates most strongly with imbibition efficiency,followed by petrophysical properties and clay mineral *** contrast,the pore type has minimal *** are vital in the imbibition process,while meso-pores and macro-pores offer primary spaces for *** study offers theoretical insights and guidance for enhancing the post-fracturing production of tight sandstone reservoirs by examining the effects of these factors on the imbibition efficiency of fracturing fluids in tight sandstones.

关键词： Tight sandstone Ordos Basin Fracturing fluid microscopic reservoir characteristics Imbibition efficiency Influencing factor

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