Abstract: The reservoirs of Qingshankou Formation are from middle to thin in thickness and have the characteristics of tight, middle porosity, low permeability, complex pore structure, small trap scope, poor oil-water differentiation and complex relationship between oil and water. The existence of oil-water layers with the relatively low resistivity, water layers with relatively high resistivity, oil layers with normal resistivity and water layers with normal resistivity makes it difficult to identify oil and water layers due to their similitude log responses. The analysis results of the relationship between log responses and influencing factors, such as lithology, granularity, porosity, pore structures, indicated that the complex log responses were resulted from the combined factors such as lithology, granularity, porosity, pore structure, formation water salinity. On the basis of general analysis, the crossplot drawn by using a combined parameter and resistivity can be used to discriminate oil and water layers.

Key words: Yaoyingtai Oilfield, Qingshankou reservoir, pore structure, irreducible water saturation, log response, crossplot, reservoir identification

摘要： 腰英台油田青山口组为中等—薄层状、致密、中孔隙低渗透储层,孔隙结构复杂。油藏圈闭幅度小,油水分异差,油水关系复杂。在测井响应中,相对低电阻率油水同层,相对高电阻率水层与一般电阻率意义上的油、水层共存,影响了对油、水层的识别。对测井响应特征与岩性、粒度、孔隙度、孔隙结构之间关系的分析结果表明,岩性、粒度、孔隙度、孔隙结构、地层水矿化度等多因素共同作用,造成了储层测井响应特征的复杂性。在常规分析基础上,应用反映储层物性特征的组合参数与电阻率编制交会图,可以快速有效地识别油、水层。

关键词: 腰英台油田, 青山口储层, 孔隙结构, 束缚水饱和度, 测井响应, 交会图, 储层识别