储层性质与核磁共振测量参数的实验研究

EXPERIMENTAL STUDY ON NMR MEASUREMENT PARAMEERS AND RESERVOIR PROPERTIES

范宜仁 倪自高 邓少贵 赵文杰 刘兵开

Fan Yiren Ni Zigao Deng Shaogui Zhao Wenjie Liu Bingkai

中国石油大学(华东)地球资源与信息学院 山东东营257061 2. 大港油田博士后工作站 天津300280 3. 胜利油田地质科学研究院 山东东营257000 4. 胜利石油管理局测井公司 山东东营257060

Faculty of Earth Resources and Information, University of Petroleum, Dongying, Shandong 257061, China 2. Post-doctor Station, Dagang Oilfield, Tianjin 300280, China 3. Research Institute of Geological Sciences, Shengli Oilfield, Dongying, Shandong 257000, China 4. Well-logging Company, Shengli Oilfield, Dongying, Shandong 257060, China

核磁共振测井可以直接分析储层流体的性质,然而却受测前采集参数的选择以及储层性质的影响。在实验室对不同油田不同孔隙度的岩心进行核磁共振T2谱分析,研究回波间隔TE、等待时间TW、含油饱和度及地层水矿化度对T2谱变化规律的影响。实验结果表明,参数TE选择的不合理会造成漏失一部分储层信息,降低短弛豫分量的分辨能力;不同的TW导致不同的流体极化量;而含油饱和度和矿化度的变化在T2谱形态上也表现出不同。因此,测前参数的选择,核磁共振测井数据的采集及处理解释要特别注意这些因素对T2谱的影响。

Nuclear magnetic resonance(NMR) logging can be directly used to determine the properties of the reservoir fluid.But it is affected by instrument parameters of pre-logging and the characters of the fluid itself.In this paper,the influences of echo spacing(TE),wait time(TW),oil saturation and salinity of formation water on the T2 spectrum shapes and the transformation rules were discussed based on the experiments of cores with different porosities acquired from different oilfields.The experimental results indicate that if the parameter TE is selected illogically,the NMR spectrum will lose some reservoir information and decrease the resolution capability to the short relaxation components.Different TW results in different fluid polarization,and the variation in the oil saturation and formation water salinity have different responses on T2 spectrum shape.Therefore,the influence on T2 spectrum of these factors should be considered in NMR logging data processing and interpretation.

中国石化集团公司先导攻关研究项目(KCL32001006)

https://doi.org/10.11781/sysydz200506624