摘要
文中介绍了四种利用核磁共振测井T2弛豫时间分布定量评价储层孔隙结构的方法,结合胜利油田A井实际资料的处理,对各种方法的适用性进行了对比分析。结果表明,三孔隙度组分百分比法、相似对比法和平均饱和度误差最小值法没有考虑储层孔隙含烃对T2谱形态特征的影响。三孔隙度组分百分比法适用于孔隙结构较好或较差的储层和水层中评价储层孔隙结构,而对于孔隙结构中等的储层则失去其作用;相似对比法和平均饱和度误差最小值法只能用于水层中构造核磁毛管压力曲线以评价储层孔隙结构;而基于Swanson参数的核磁毛管压力曲线构造方法采用实际测量的核磁共振测井资料,适用于各种不同类型的储集层中评价储层孔隙结构。通过与岩心资料对比,其结果的可靠性得到验证,具有一定的推广应用价值。
Four methods which are used to quantitatively evaluate reservoir pore structure by using nuclear magnetic resonance (NMR) T2 distribution were introduced in this paper,by integrating actual data processing for well A in Shengli oilfield,the applicability of the methods was compared and analyzed. The results show that the three porosity component percentage method,similarity comparative method and average saturation error minimum value method didn't consider the affects which was applied by hydrocarbon existing in reservoir pore space to the shape feature of T2 spectrum. The three porosity component percentage method was feasible to evaluate reservoir pore structure for the reservoir and water zone with good pore structure and bad structure,but not feasible for reservoir with moderate pore structure. The similarity comparative method and average saturation error minimum value method can only be used in water zones to construct NMR capillary pressure curves for evaluating reservoir pore structure. The NMR capillary pressure curves constructing method which is based on Swanson parameter utilized the real NMR well logging data and feasible to evaluate reservoir pore structure for different types of reservoir. After comparing with core data the reliability of the results was verified,as a result the method is worth to be promoted in the oil-filed for extensive use and application.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2009年第6期773-778,共6页
Oil Geophysical Prospecting
基金
国家重点基础研究发展计划"973"专题(2006CB705801)资助
关键词
核磁共振测井
孔隙结构
核磁毛管压力曲线
对比分析
适用性
nuclear magnetic resonance (NMR) log,pore structure,NMR capillary pressure curves,comparative analysis,applicability
