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低渗透储层微观孔隙结构是储层研究的重点与难点,直接影响储层评价的准确性。以鄂尔多斯盆地旬邑-宜君区块延长组长3段低渗透储层为例,在薄片观察、岩石孔渗、压汞测试与测井资料分析基础上,研究储层微观孔隙结构类型及特征,将储层分为4种孔隙结构类型,阐述各类储层的储集空间类型、孔渗特征、毛管压力曲线特征差异,Ⅰ类和Ⅱ类储层为研究区有利储层;选用储层品质系数与储层微观孔隙结构特征参数(排驱压力、平均孔喉半径和分选系数),对储层进行评价;WB44等4口井评价结果表明,储层孔隙结构类型影响低渗透储层的产能评价和测井解释。
The microscopic pore structure of low permeability reservoir is the key and difficult point of reservoir research, which has a direct impact on the accuracy of reservoir evaluation. Taking the low permeability reservoir of Member 3 of Yanchang Formation in Xunyi-Yijun Block, Ordos Basin as an example, the types and characteristics of microscopic pore structure of reservoir are studied based on the observation of thin sections, pore permeability, mercury intrusion test and logging data analysis The reservoirs are divided into four kinds of pore structure types. The reservoir types, pore-permeability characteristics and capillary pressure curves of different reservoirs are described. The type I and type II reservoirs are favorable reservoirs in the study area. The quality coefficient and the characteristic parameters of micro-pore structure of reservoir (displacement pressure, average pore throat radius and sorting coefficient) to evaluate the reservoirs. The evaluation results of 4 wells such as WB44 show that the type of reservoir pore structure affects the permeability of low-permeability reservoirs Productivity evaluation and logging interpretation.