储层性质与核磁共振测量参数的实验研究  

EXPERIMENTAL STUDY ON NMR MEASUREMENT PARAMETERS AND RESERVOIR PROPERTIES

作　　者：范宜仁[1] 倪自高 邓少贵[1] 赵文杰[2] 刘兵开[2] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院 [2]胜利石油管理局测井公司,山东东营257060

出　　处：《石油实验地质》2005年第6期624-626,共3页Petroleum Geology & Experiment

基　　金：中国石化集团公司先导攻关研究项目(KCL32001006)

摘　　要：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 properues 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.

关 键 词：核磁共振T2谱 储层性质 回波间隔 等待时间 

分 类 号：TE19[石油与天然气工程—油气勘探]