融合随钻核磁共振与机器学习的疏松砂岩储层孔隙结构评价新方法  

A New Method for Evaluating Pore Structure of Unconsolidated Sandstone Reservoirs by Combining Nuclear Magnetic Resonance While Drilling and Machine Learning

作　　者：孙康[1,2] 张冲 崔云江[3] 时新磊 SUN Kang;ZHANG Chong;CUI Yunjiang;SHI Xinlei(Key Laboratory of Ministry of Education for Oil and Gas Resource and Exploration Technologies,Yangtze University,Wuhan,Hubei 430100,China;College of Geophysics and Petroleum Resources,Yangtze University,Wuhan,Hubei 430100,China;Tianjin Branch,CNOOC(China)Co.,Ltd.,Tianjin 300459,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [2]长江大学地球物理与石油资源学院,湖北武汉430100 [3]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《西安石油大学学报（自然科学版）》2023年第5期20-28,共9页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中海石油(中国)有限公司重大科技专项“渤海油田稳产3000万吨,上产4000万吨关键技术研究”(CNOOC-KJ135ZDXM36TJ01TJ-GD2020-02)。

摘　　要：针对疏松砂岩常规物性、压汞实验难度大,岩心标定测井评价孔隙结构精度低的特点,通过随钻核磁共振测井T_(2)谱、铸体薄片分析资料,采用特征参数提取、主成分分析、高斯混合聚类算法,对研究区储层孔隙结构进行分类。研究结果表明:随钻核磁共振T_(2)谱中能够提取表征孔隙连通性、大小及分布的13个特征参数,经主成分分析、高斯混合聚类算法处理解释后,研究区储层孔隙结构分为Ⅰ—Ⅴ共五类,T_(2)谱逐渐向左偏移,小孔隙占比逐渐增大,岩性从粗砂岩过渡至细-中砂岩,孔隙类型从粒间孔过渡至粒间溶孔,孔隙结构逐渐变差。In view of the difficulty in conventional physical property and mercury intrusion experiments of unconsolidated sandstone and the low accuracy of evaluating the pore structure of unconsolidated sandstone by core calibration logging,based on the analysis data of NMR logging spectrum while drilling and core casting slices,the pore structure of the reservoir in the study area is classified by using feature parameter extraction,principal component analysis,and Gaussian mixture model algorithm.The results show that 13 feature parameters characterizing pore connectivity,size and distribution can be extracted from NMR logging T_(2)spectrum,and after being processed and interpreted by principal component analysis and Gaussian mixture model algorithm,the pore structure of the reservoir in the study area is divided into five types.From type I to type V,its T_(2)spectrum gradually shifts to the left,the proportion of small pores gradually increases,the lithology transitions from coarse sandstone to medium-fine sandstone,the pore type transitions from intergranular pores to intergranular dissolved pores,and the pore structure gradually becomes worse.

关 键 词：孔隙结构评价 随钻核磁共振 高斯混合模型 主成分分析 疏松砂岩 

分 类 号：TE122[石油与天然气工程—油气勘探]