随着致密油资源勘探开发工作的不断推进,致密砂岩储集层物性下限的研究也变得重要,对已发现油藏有效储集层物性下限的研究可以帮助预测勘探有利区.对前人工作和成果的研究显示,致密储集层物性下限的确定方法可以分为三类:一是正向研究法,通过对岩心样品的各类实验来求取储集层物性下限,包括毛细管压力法、模拟充注法、束缚水饱和度法、最小流动孔喉半径法和吸附水膜厚度法;二是反向研究法,通过实际的生产资料来求取储集层物性下限,包括试油资料统计法、孔隙度-渗透率交会图法、含油产状法、分布函数曲线法;三是综合研究法,将多种方法相结合来求取储集层物性下限.对比三类研究方法发现,正向研究法所求得的物性下限结果小于反向研究法取得的结果,但其实验过程较为复杂,而反向研究法取得的结果受限于现今的经济和技术条件,结果高于正向法确定的物性下限值,但其对生产指导意义更大,因此需要综合使用来确定致密储集层的物性下限.%With the advancement of tight oil resource exploration and development, the research of the porosity and permeability cutoffs for tight sandstone reservoir becomes important, which can be used to predict favorable areas for exploration. Based on the study of other's work, the determination method for the porosity and permeability cutoffs can be divided into three categories, (1)Positive method, to calculate the porosity and permeability cutoffs through various experiments on cores, including capillary pressure analysis, the simulation of filling, the irreducible water saturation, minimum flow pore throat radius and the adsorption of water film thickness;(2) Reverse method, to calculate porosity and permeability cutoffs according to actual production data, including oil testing data statistics,φ - K crossplot, oil bearing condition of the tight sandstone, the distribution function curve method;(3) Comprehensive study method, to calculate the porosity and permeability cutoffs with combined methods. Through the comparison of the three methods, it is found that the results of positive study are less than that of reverse method, however,the process is complicated relatively. And the reverse method is limited by current economic and technical conditions and the results are larger than the positive method with greater significance to guide production. Thus, integrated application shall be conducted to identify the porosity and permeability cutoffs.
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