摘要
Nahr Umr B是伊拉克Halfaya油田的重要储集层,地层测试数据的缺乏给储层的含油性评价和测井解释带来了极大的挑战。基于岩心观察和岩石物理试验,结合常规测井、核磁共振测井以及有限的试油资料进行研究区复杂岩性储层含油性评价:首先确定储层的孔隙度下限为12%,建立电阻率-孔隙度交会图识别油、水层;然后通过试验确定的胶结指数、饱和度指数以及地层水电阻率等关键参数,计算含油饱和度,建立含油饱和度-孔隙度交会图识别油、水层;再利用电阻率-孔隙度曲线相关性分析法识别油、水层;最后,对比分析上述3种图版的适用性,提出了Nahr Umr B复杂岩性储层含油性评价的优选方案。通过实际测井资料的处理和解释,验证了该优选方案的可靠性,为研究区的含油性测井评价以及提高解释符合率提供了借鉴。
The Nahr Umr B Formation was one of the most important reservoirs in Halfaya Oilfield,where formation test data were insufficient,great challenges were induced to the oil-bearing evaluation and logging interpretation.Based on core observation and petrophysical experiments,in combination with conventional logging,nuclear magnetic resonance logging and limited oil test data,logging evaluation on oil-bearing property was conducted on the reservoir with complex lithology in the studied area.Firstly,the lower limit of porosity was determined as 12%,the resistivity-porosity cross plot was developed to identify oil and water layers.And then the key parameters,such as cementation index,saturation index and resistivity in formation water were determined according to petrophysical experiments.And oil saturation was calculated,oil saturation-porosity cross plot was established for identifying oil and water layers.The method of resistivity-porosity correlation analysis was used for identifying the oil and water layers.Eventually adaptability of the above 3 chart boards is comparatively analyzed,an optimized scheme is proposed for oil-bearing evaluation on Nahr Umr B Reservoir with complex lithology.Through the actual logging data treatment,the feasibility of optimized scheme is proven,it provides reference for oil bearing logging evaluation and improving the coincidence of logging evaluation.in Halfaya oilfield.
引文
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