核磁共振测井在古龙页岩油评价中的应用  

Application of NMR Logging in the Evaluation of Gulong Shale Oil

作　　者：陈龙川 张兆谦 郑建东[1,2] 王春燕 朱建华[1,2] 王文娟 高吉峰[1,2] CHEN Longchuan;ZHANG Zhaoqian;ZHENG Jiandong;WANG Chunyan;ZHU Jianhua;WANG Wenjuan;GAO Jifeng(Exploration and Development Research Institute,CNPC Daqing Oilfield,Daqing,Heilongjiang 163712,China;Heilongjiang Provincial Key Laboratory of Continental Shale Oil,Daqing,Heilongjiang 163712,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]黑龙江省陆相页岩油重点实验室,黑龙江大庆163712

出　　处：《测井技术》2024年第1期110-116,共7页Well Logging Technology

基　　金：中国石油天然气股份有限公司科技重大专项“陆相页岩油规模增储上产与勘探开发技术研究”(2023ZZ15-02);中国石油天然气股份有限公司科技重大专项“陆相页岩油地球物理建模关键技术研究”(2023ZZ15YJ02)。

摘　　要：古龙页岩油储层黏土含量高,孔隙结构较为复杂,微米-纳米孔喉及微裂缝发育,利用常规方法评价储层孔隙结构及物性、含油性具有较大难度。针对以上难题,在岩石物理实验基础上,提出了核磁共振变T_(2)谱截止值有效孔隙度计算方法和考虑小孔隙含油的二维核磁共振含油饱和度计算模型,并通过核磁共振区间孔隙度分析,厘清了古龙页岩储层孔隙结构。利用该方法计算的有效孔隙度平均相对误差为7.3%,含油饱和度平均绝对误差为4.0%,这不仅提高了计算储量关键参数的解释精度,还为后续开发提供了技术保障。该技术流程和方法对于类似页岩油的有效孔隙度和含油饱和度的评价同样具有指导意义,有助于推动页岩油等非常规油气资源的开发利用。Gulong shale oil reservoir has a high clay content,complex pore structure,and developed micro-nano pore throats and micro fractures.It is difficult to evaluate the characterization of reservoir pore structure,physical properties,and oil content using conventional methods.In response to the above difficulties,based on rock physics experiments,a nuclear magnetic resonance(NMR)T_(2)cutoff effective porosity calculation method and a 2D NMR oil saturation calculation model considering small pore oil content are proposed.Through NMR interval porosity analysis,the pore structure of the Gulong shale reservoir is clarified.The average relative error of effective porosity calculated by the above method is 7.3%,and the average absolute error of oil saturation is 4.0%.This method improves the interpretation accuracy of key parameters submitted for reserves,also provides technical support for reserve calculation and development plan preparation and implementation.These technical processes and methods also have guiding significance for evaluating the effective porosity and oil saturation of shale oil,and the research content can help promote the development and utilization of unconventional oil and gas resources such as shale oil.

关 键 词：古龙页岩油 核磁共振测井 孔隙度 含油饱和度 二维核磁共振 

分 类 号：P631.84[天文地球—地质矿产勘探]