In view of the problem that the resistivity of Chang 4+5 reservoir is low and the explanation is difficult, in this paper, the causes of low-resistivity reservoirs in the southern part of Youfangzhuang are analyzed by means of logging interpretation as the main technical means, combined with core data, analysis of laboratory data and test oil production data.The results show that the purpose of reservoirs is low due to the low tectonic range and the difference of oil and water, which affects the natural enrichment of oil and gas and the development of low oil saturation reservoirs in large area.Controlled by the delta sedimentary facies, the fine rock strength and the micropore development, which leads to the higher water saturation of the reservoir.Exactly, the regional tectonics and sedimentary facies are the main controlling factors for the formation of low resistivity reservoirs of Chang 4+5.Based on the analysis of the causes, the effective identification and evaluation of the low resistivity reservoirs are realized by using the curve superposition and the intersection diagram, and the effective identification of the low resistivity reservoirs with similar geological characteristics in this area provides a solution to the idea.%针对研究区长4+5油层电阻率偏低、解释难度较大的问题,本文以测井解释为主要技术手段,结合岩心资料、分析化验数据及试油生产等数据,对油房庄南部低阻油层的成因进行分析.结果表明:目的储层由于构造幅度低,油水分异差,影响了油气的天然富集程度,大面积发育低含油饱和度油层;受前三角洲沉积相带控制,岩石力度细、微孔隙发育,导致储层束缚水饱和度较高,即区域构造和沉积相带是油房庄南部长4+5形成低阻油层的主控因素.在成因分析基础上,对常规测井响应参数运用曲线叠合和交会图等手段,实现了对低阻油层的有效识别和评价,并为与本区有类似地质特征的低阻油层的有效识别提供了解决思路.
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