疏松砂岩密闭取心井油水饱和度校正  

Study on oil-water saturation correction from sealed core wells of loose sandstone

作　　者：唐磊 康楠 何伟 洪鑫 刘泠杉 郭磊 张露 ANG Lei;KANG Nan;HE Wei;HONG Xin;LIU Lingshan;GUO Lei;ZHANG Lu(Energy Technology and Services-Oilfield Engineering Research Institute,CNOOC,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《石油化工应用》2020年第8期55-59,共5页Petrochemical Industry Application

摘　　要：在密闭取心和疏松岩心油水饱和度测定过程中,岩样从地下提取到地面过程中由于压力释放、颗粒松散易落等原因,使原始岩心中的流体有部分损失,造成测量的饱和度值和地下真实情况存在偏差。本文基于密闭取心井岩心饱和度的损失机理,从疏松砂岩储层饱和度主要影响因素入手,利用核磁共振技术对储层含油饱和度进行恢复,并结合改进后的数理统计法对地面油水饱和度进行校正,探讨了疏松砂岩储层饱和度数据间的线性关系,大大提高了饱和度数据线性关系的相关性,形成了一套比较有效的疏松砂岩储层饱和度校正方法。运用实例表明,相关系数都在0.90以上,完全满足了使用要求,且运用效果良好。In the process of sealed coring and oil-water saturation testing of loose sandstone,the pressure of rock sample will be released and the particles will loose and fall easily from the ground to the ground,which result in the loss of the fluid in original cores and the deviation between the oil-water saturation measured with these in-situ.In this paper,nuclear magnetic resonance technology is used to restore the oil saturation of the reservoir,and combined with the improved mathematical statistics method to correct the surface oil and water saturation.Then the authors discusses the linear relationship between the saturation data of loose sandstone reservoirs based on the core saturation loss mechanism and the main influencing factors of loose sandstone reservoir saturation,which improve the correlation of the linear relationship of saturation data greatly,a more effective method for correcting the saturation of loose sandstone reservoirs is formed finally.Application examples show that the correlation coefficients are all above 0.90,which fully meets the use requirements and has good application effects.

关 键 词：疏松砂岩 密闭取心井 核磁共振 饱和度校正 

分 类 号：TE122.23[石油与天然气工程—油气勘探]