天然气对火山岩核磁共振测井的影响及孔隙度校正方法研究  

Research on Influence of Natural Gas for Volcanic Nuclear Magnetic Resonance Logging and Correction Method of Porosity

作　　者：肖丽[1] 莫修文[1] 

机构地区：[1]吉林大学地球探测科学与技术学院

出　　处：《国外测井技术》2012年第6期38-40,3,共3页World Well Logging Technology

摘　　要：火山岩储层岩性复杂,难以得到准确的骨架参数,核磁测井可以得到与岩性无关的孔隙,但受到天然气存在的影响,核磁测量得到的孔隙度也会有偏差,通过核磁实测数据与岩芯分析数据对比分析发现,气主要存在于岩石的自由孔隙中,表现为横向弛豫谱(T2谱)可动峰幅值降低。利用密度与核磁测井孔隙度结合计算可以用来计算气层孔隙度,针对实际数据处理,证实效果较好,与岩心分析孔隙度较符合。It's difficult to gain precise matrix parameters for lithology complexity of volcanic reservoirs.Nuclear magnetic resonance (NMR) logging can gain porosity independent of lithology.But porosity from NMR logging will deviation if reservoirs bearing nature gas.Through comparison measured data from NMR and core analysis data,we found that gas mainly occurrence in rock free pore makes the amplitude of transverse relaxation moving peak decrease.Research on the influence of gas bearing,we can correctly understand pore structure of reservoirs,and calculate porosity of gas zone using porosity of density and NMR logging.It is verified that calculate result is correspond well with porosity from core analysis.

关 键 词：含气层 核磁共振 T2谱 孔隙度 

分 类 号：P631.813[天文地球—地质矿产勘探]