PNN测井反演地层电阻率求取饱和度方法研究  

Methodological Study on Obtaining Saturation by PNN Logging Inversion Formation Resistivity

作　　者：肖承文[1] 周波[1] 吴刚[1] 赵勃权 李强[2] 邓瑞[3] 

机构地区：[1]中石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]中国石油集团测井有限公司,陕西西安710077 [3]长江大学地球物理与石油资源学院,湖北武汉430100

出　　处：《石油天然气学报》2013年第9期76-79,1,共4页Journal of Oil and Gas Technology

基　　金：国家科技重大专项(2008ZX05020-005)

摘　　要：PNN(pulse neutron neutron,脉冲中子-中子)测井通过探测热中子的方法消除了伽马探测方法的本底值影响,保证了Σ(地层俘获截面)曲线的准确性。PNN测井曲线和裸眼井电阻率曲线反映的同是地层信息,通过建立未射孔层段地层俘获截面曲线与裸眼井地层电阻率曲线的关系特征,反演射孔层段的电阻率,得到射孔层段的真实电阻率,再进行饱和度求取。地层俘获截面曲线校正后得到的电阻率曲线在部分射孔层段表现出电阻率普遍减小的特征,含气饱和度降低明显,可定性判断为该射孔层段随着生产的进行,出现了一定程度的水淹。The PNN(pulse neutron-neutron)logging eliminated the influence of background value in gamma detection method by detected the thermal neutron method,ensured the accuracy of SIGM(formation capture cross section) curve.Both PNN logging and borehole resistivity curve reflected the stratigraphic information,by establishing the characteristics of non-perforated SIGM curve and the open hole formation resistivity curve,inversion of resistivity of nonperforated section was performed for obtaining the true resistivity of the perforating section and then saturation calculation was carried out.The resistivity curve obtained from captured cross section curve after correction is characterized by low resistivity in some of the perforating sections with gas saturation decreasing significantly,it can be qualitatively judged that the perforating section is flooded at certain extent with the production processing.

关 键 词：PNN测井 饱和度求取 地层电阻率 俘获截面 

分 类 号：P631.81[天文地球—地质矿产勘探]