成都理工大学学报（自然科学版）2011，Vol.38Issue(6)：593-602,10.
储层孔隙度-渗透率关系曲线中的截止孔隙度与储层质量
Porosity cutoff of porosity-permeability curve and the reservoir quality
摘要
Abstract
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. 1μ 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 μ 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.关键词
储层质量/孔隙度-渗透率关系/截止孔隙度/烃类储量计算与孔隙度下限Key words
reservoir quality/ porosity-permeability curve / porosity cutoff/ calculation of hydrocarbon reserves and lower limit porosity分类
能源科技引用本文复制引用
黄思静,郎咸国,兰叶芳,魏文文..储层孔隙度-渗透率关系曲线中的截止孔隙度与储层质量[J].成都理工大学学报（自然科学版）,2011,38(6):593-602,10.基金项目
国家自然科学基金资助项目(40839908) （40839908）
