录井核磁共振技术在实际应用中的问题与探讨
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摘要
近年来,核磁录井分析技术在储集层解释评价中发挥了重要作用,核磁共振录井技术主要用于钻井现场快速评价储集层物性及流体性质,通过提供储集层的孔隙度、渗透率、可动流体饱和度、束缚流体饱和度等参数,为进一步分析判断储集层流体性质提供依据,为油田勘探开发提供优质的解释评价服务。但该技术在实际应用中发现了一些问题:一是岩样孔隙内剩余流体性质的判断;二是含油饱和度测量后油相信号超出饱和状态信号,出现数据溢出现象。针对第一种情况,通过对岩样进行三次扫描,可以较好地解释孔隙内剩余流体的性质;就第二种情况经过实验研究,针对不同的原因分别提出了相应的对策。
In recent years,nuclear magnetic mud logging analysis technology has played an important role in reservoir interpretation and evaluation.Nuclear magnetic resonance(NMR) mud logging technology is mainly used for rapid evaluation of reservoir physical properties and fluid properties in drilling site,which can provide reservoir parameters such as porosity,permeability,movable fluid saturation,irreducible fluid saturation,etc.,provide basis for further analysis and judgment of reservoir fluid properties,and provide high-quality interpretation and evaluation services for oilfield exploration and development.However,some problems have been found in the practical application of this technology.One is the judgment of residual fluid properties in pores of core sample,the other is that the oil phase signal exceeds the saturation state signal after oil saturation measurement,and the data-overrun occurs.For the first case,the properties of residual fluid in pores can be well explained by scanning core samples three times.Based on the experimental study of the second case,the corresponding countermeasures were put forward for different reasons.
In recent years,nuclear magnetic mud logging analysis technology has played an important role in reservoir interpretation and evaluation.Nuclear magnetic resonance(NMR) mud logging technology is mainly used for rapid evaluation of reservoir physical properties and fluid properties in drilling site,which can provide reservoir parameters such as porosity,permeability,movable fluid saturation,irreducible fluid saturation,etc.,provide basis for further analysis and judgment of reservoir fluid properties,and provide high-quality interpretation and evaluation services for oilfield exploration and development.However,some problems have been found in the practical application of this technology.One is the judgment of residual fluid properties in pores of core sample,the other is that the oil phase signal exceeds the saturation state signal after oil saturation measurement,and the data-overrun occurs.For the first case,the properties of residual fluid in pores can be well explained by scanning core samples three times.Based on the experimental study of the second case,the corresponding countermeasures were put forward for different reasons.
引文
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[4] 肖秋生,朱巨义.岩样核磁共振分析方法及其在油田勘探中的应用[J].石油实验地质,2009,31(1):97-100.XIAO Qiusheng,ZHU Juyi.Analysis method of rock NMR and its application in oilfield exploration[J].Petroleum Geology and Experiment,2009,31(1):97-100.
[5] 倪卫平.试论核磁共振录井技术在油田开采中的应用[J].中国新技术新产品,2013(2):105.NI Weiping.Discussion on the application of NMR logging technology in oilfield exploitation[J].China New Technologies and New Products,2013(2):105.
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