基于库伦法和核磁共振的玛湖致密砾岩密闭取心饱和度实验测量方法  

New method for measuring saturation of Mahu conglomerate by closed coring based on Coulomb method and nuclear magnetic resonance

作　　者：郭慧英 王蓓 寇根 林治忠 周浩 朱亚婷 GUO HuiYing;WANG Bei;KOU Gen;LIN ZhiZhong;ZHOU Hao;ZHU YaTing(Research Institute of Experiment and Detection,Xinjiang Oilfield Company,Karamay 834000,China;Xinjiang Conglomerate Reservoir Laboratory,Karamay 834000,China;Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China)

机构地区：[1]中石油新疆油田分公司实验检测研究院,克拉玛依834000 [2]新疆砾岩油藏实验室,克拉玛依834000 [3]中石油新疆油田分公司勘探开发研究院,克拉玛依834000

出　　处：《地球物理学进展》2021年第6期2693-2701,共9页Progress in Geophysics

基　　金：中国石油天然气集团公司重大专项“准噶尔南缘和玛湖等重点地区优快钻完井技术集成与试验”(2019F-33)资助。

摘　　要：玛湖砾岩具有泥质含量高以及物性致密的特点,常规的蒸馏抽提法和干馏法无法满足密闭取心饱和度测量需要.基于文献调研,对16块预设了饱和度的玛湖砾岩代表性岩心开展了库伦法、核磁共振法测量岩样的含水体积、孔隙度和含油饱和度的实验研究.结果发现:(1)对于砾岩,库伦法萃取时间1.5 h就可以稳定,测量砾岩岩心含水体积准确,饱和度误差一般小于5%,结果受泥质与黏土影响较小;(2)核磁共振法测量饱和状态砾岩岩心孔隙度和束缚水状态砾岩岩心孔隙度偏差值小于0.5%,表明可以对密闭取心通过饱和油水准确测量孔隙度,但由于MnCl_(2)对水信号的消除效果较差,测量的含油饱和度偏大在5%以上,不能使用;(3)利用基于库伦法、核磁共振法开发的组合方法测量的含水饱和度偏差整体小于2%,含油饱和度偏差整体小于1%;该新方法具有受砾岩的泥质含量和物性影响小、2天即可完成岩样的批量测量等优点.Mahu conglomerate reservior has the characteristics of high clay content and dense physical properties.The conventional distillation extraction method and dry distillation method can not meet the needs of closed coring saturation measurement.Based on the literature research,the experimental study on measuring water content,porosity and oil saturation of 16 representative cores of Mahu conglomerate with preset saturation by Coulomb method and nuclear magnetic resonance method was carried out.The results show that:(1)for conglomerate,the extraction time of Coulomb method can be stable for 1.5 hours,and the measurement of water content volume of conglomerate core is accurate,the saturation error is generally less than 5%,and the results are not affected by clay;(2)the deviation value of NMR method in measuring the porosity of saturated conglomerate core and bound water state conglomerate core is less than 0.5%,which indicates that the closed coring can pass through saturated oil and water The porosity can be measured accurately,but the oil saturation measured by MnCl_(2)is more than 5%due to the poor effect of eliminating water signal by MnCl_(2);(3)a combined method based on Coulomb method and nuclear magnetic resonance method can be developed.The deviation of water saturation measurement is less than 2%and the deviation of oil saturation measurement is less than 1%,which is less affected by clay content and physical properties of conglomerate The batch measurement of rock samples can be completed within days.

关 键 词：砾岩 库伦法 核磁共振法 孔隙度 饱和度 

分 类 号：P631[天文地球—地质矿产勘探]