核磁共振长短等待时间极化增强在低阻油层识别中的应用——以环庆地区西部长8油层为例  

Application of polarized enhancement raised by nuclear magnetic resonance long and short waiting time in low resistivity oil layer identification:a case study of the Chang 8 oil layer in the western of the Huanqing area

作　　者：雷琳琳 唐海忠 张虔 陈建军 赵燕红 曾利刚 LEI LinLin;TANG HaiZhong;ZHANG Qian;CHEN JianJun;ZHAO YanHong;ZENG LiGang(Geological Research Institute,China National Logging Corporation Co.,Ltd.,Xi'an 710021,China;Yumen Oilfield Company,PetroChina,Jiuquan 735019,China)

机构地区：[1]中国石油集团测井有限公司地质研究院,西安710021 [2]中国石油集团玉门油田分公司,酒泉735019

出　　处：《地球物理学进展》2024年第2期678-688,共11页Progress in Geophysics

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“岩性地层油气藏成藏规律与关键技术研究”(2021DJ0406)资助。

摘　　要：勘探开发表明,鄂尔多斯盆地环庆地区长8普遍发育低阻油层,为进一步探明研究区低阻油层的富集区并进行高效开发,须明确低阻油层的成因,并提出针对性的流体识别方法.文中充分结合地层水、束缚水及全岩矿物X衍射实验等资料,分析后认为:高地层水矿化度和高束缚水饱和度共同作用导致低阻油层的形成.在明确低阻成因的基础上,充分挖掘核磁测井中的信息,利用长短等待时间(双TW)对应的可动流体之差指示的FLAG参数及T_(2)几何均值重叠表征流体性质之间的微弱差异,构建研究区低阻油层定量化解释图版,并确定相关参数标准.应用效果表明,核磁双TW极化增强法有效提高了环庆地区长8低阻油层流体识别的准确性,可为研究区邻区低阻油层识别提供一定的借鉴意义.Exploration and development show that low resistivity oil layer is generally developed in the Chang 8 of Huanqing area of Ordos basin,in order to further explore the rich area of low resistivity oil layer in the study area and carry out efficient development,it is necessary to identify the cause of low resistivity oil layer and put forward a specific fluid identification method.Based on the data of formation water,bound water and whole rock mineral X-ray diffraction experiment,it is concluded that high formation water salinity and high bound water saturation lead to the formation of low resistivity oil layer.On the basis of identifying the cause of low resistivity,fully mining the information in Nuclear Magnetic Resonance(NMR)logging,using the FLAG parameter indicated by the difference of moving fluid corresponding to long and short waiting time(dual TW)and the overlap of T_(2)geometric means to characterize the weak difference between fluid properties,constructing the quantitative interpretation chart of low resistivity oil layer in the study area,and determining the relevant parameter standards.The application results show that the NMR(dual TW)polarization enhancement method can effectively improve the accuracy of fluid identification of the Chang 8 low resistivity oil layer in Huanqing area,and can provide certain reference significance for the identification of low resistivity oil layer in adjacent areas of the study area.

关 键 词：环庆地区 核磁共振测井(双TW) 低阻油层 流体识别 

分 类 号：P631[天文地球—地质矿产勘探]