鄂尔多斯盆地演武油田隐蔽性低阻油藏识别方法

探讨鄂尔多斯盆地演武油田侏罗系低阻油藏油水层识别方法,为同类型油藏开发提供依据。通过对延9油藏地层水矿化度分析、油水层束缚水饱和度计算、重点井矿片导电矿物研究等,分析了演武油田低阻油藏的成因。结果表明该区侏罗系低阻油藏主要受高地层水矿化度、高束缚水饱和度、储层岩石较强的亲水性等多重因素控制。结合开发实践,总结了适应本地区低阻油藏识别的电阻率曲线特征、侵入因子与声波时差关系图、视电阻率与自然电位关系图等多种低阻油藏识别方法,应用多种识别方法筛选出潜力建产目标区。在开发过程中,地质规律分析与多种油水层识别方法综合应用,相互验证,才能提高油藏识别率。

Identification of low resistivity reservoir in Yanwu oilfield,Ordos Basin,China

The methods of oil-water layer identification for Jurassic low resistivity reservoir are discussed so as to provide references for exploration and enhance the development efficiency.Salinity data,bound water saturation and the key well mineral conductive minerals are analyzed and the reason of low resistivity reservoir in Yanwu oilfield of Ordos Basin is studied.It shows that the low resistivity reservoir of Jurassic stratum is mainly controlled by high formation water salinity,high irreducible water saturation and strongly hydrophilic reservoir rock.Such methods as resistivity of curve characteristics,invasive factor and acoustic time difference intersection chart,apparent resistivity-SP intersection chart are considered suitable for the recognition of low resistivity reservoir in the area.In the process of oil and gas development,the combination of geological law analysis and integrated application of many kinds of oil and water layer identification methods can improve the discrimination low resistivity reservoir.