伊拉克Halfaya油田Nahr Umr B复杂岩性储层含油性测井评价方法及优选
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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.
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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[3]Archie G E.The electrical resistivity log as an aid in determining some reservoir characteristics[J].AIME,1942,146(1):54~61.
[4]Waxman M,Smits L J M.Electrical conductivities in oil bearing shaly sand[J].SPE Journal,1968,42(3):107~122.
[5]Clavier C,Coates G,Dumanoir J.Theory and experimental basis for the dual-water model for interpretation of shaly sands[J].SPE6859,1977.
[6]冯程,毛志强,石玉江,等.测井曲线相关性分析及其在复杂润湿性油层识别中的应用[J].科学技术与工程,2015,15(21):129~134.
[7]王志磊,郭红梅.测井曲线相关性分析及其在致密砂岩气层识别中的应用[J].工程地球物理学报,2011,8(1):68~71.
[8]张晓明,王晓红,郑秀臣,等.铁边城地区深层低电阻率油层成因及测井识别技术[J].测井技术,2010,34(4):360~364.
[9]李振岺,李华,宋小增,等.基于阵列感应测井径向侵入特征的油水层识别方法[J].石油钻采工艺,2009,31(2):55~59.
[10]刘英.不同沉积微相的感应曲线侵入特性在油水层识别中的应用[J].测井技术,2008,32(6):525~533.
[11]文政,徐广田,葛百成.大庆长垣以西地区复杂油水层成因及测井解释方法[J].大庆石油地质与开发,2005,24(2):100~102.
[12]毛志强,谭廷栋.密度测井和中子测井的相关性及其在识别天然气层中的应用[J].地球物理学报,1996,39(1):125~132.