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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2011-06
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Porosity cutoff of porosity-permeability curve and the reservoir quality

HUANG Si-jing,LANG Xian-guo,LAN Ye-fang,WEI Wen-wen State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China  
The porosity cutoff is critical porosity for a required permeability which is commonly obtained from a porosity-permeability plot.It also indicates the sedimentary and diagenetic factors characters,such as reservoir rocks structure(the content of matrix or mud,particle size and sorting),composition of authigenic mineral(such as the content of authigenic minerals as the pore-lining presence),dolomite content and reservoir pore structure(interparticle,intercrystalline,intraparticle,moldic,macropores,mesopores and micropores,etc.) and so on.The porosity cutoff of different oil layers of the Triassic Yanchang Formation in eastern Gansu of Ordos Basin changes between 7% to 12% at 0.1×10-3 μm2 permeability,which is mainly controlled by the meteoric action and secondary porosity formation in the interval of Indosinian exposure.If 0.1×10-3 μm2 permeability is used as the lower limit of sandstone,that of the corresponding porosity changes generally between 7%~12%,which will obviously affect the calculation of hydrocarbon reserves of different oil formations.The authigenic minerals mainly presenting in the form of pore-lining cement can protect porosity space of buried sandstones,but the increasing content of these cements will lead to porosity cutoff increasing,the reservoir quality is worse than that with similar porosity but lack of pore-lining cement.Porosity cutoffs show significant variability among the different pore types of carbonate reservoirs,ranging from 5.4% to 31.3% at 1×10-3 μm2 permeability.The carbonate reservoir mainly consist of intercrystalline and intraparticle pores has minimum porosity cutoff and better reservoir quality.The carbonate reservoir mainly consists of mudstone micropores has maximum porosity cutoff and worst reservoir quality.The carbonate reservoir mainly consists of intraparticle and moldic has medium porosity cutoff and reservoir quality.
【Fund】: 国家自然科学基金资助项目(40839908)
【CateGory Index】: P618.13
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