全直径岩心核磁扫描数据超分辨率重建技术——一种基于全局非负最小二乘的方法

Super-resolution reconstruction technology for full-diameter core nuclear magnetic resonance scanning data: a global non-negative least squares-based approach

马莹颖 彭泽波 陈敬智 吴飞 聂昕 廖中枢 张宫

MA Yingying PENG Zebo CHEN Jingzhi WU Fei NIE Xin LIAO Zhongshu ZHANG Gong

长江大学 油气资源与勘探技术教育部重点实验室, 武汉 430100 中国石油 新疆油田分公司 勘探事业部, 新疆 克拉玛依 834000 中海油田服务股份有限公司 油田技术研究院, 北京 101149 苏州纽迈分析仪器股份有限公司, 江苏 苏州 215000

Key Laboratory of Exploration Technology for Oil and Gas Resources of Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China Oilfield Exploration Division, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China Oilfield Technology Research Institute, China Oilfield Services Limited, Beijing 101149, China Suzhou Niumag Analytical Instrument Corporation, Suzhou, Jiangsu 215000, China

全直径岩心核磁共振扫描技术是非常规油气勘探中重要的探测分析技术之一，可以得到连续高分辨的钻井岩心孔隙度、渗透率及流体饱和度等信息。但由于其测量敏感区较大，不同位置信号混叠在一起，测量结果纵向分辨率远低于仪器采样的分辨率，无法满足薄互层储层对纵向分辨率的要求。为提高全直径岩心核磁共振测量结果的纵向分辨率，将测量数据作为仪器敏感区函数和岩心真实信号的卷积，并通过全局非负最小二乘的方法实现原始信号的高分辨率重建，无需改变现有仪器结构和测量模式。通过数值模拟、物理实验和实测数据分析验证了该方法的可行性，实际资料应用表明，高分辨率处理后的核磁共振测井孔隙度与气测孔隙度符合率更高，该方法能够显著提高全直径岩心核磁测量结果的纵向分辨率，可以为薄互层储层带来更好的探测效果。

Full-diameter core nuclear magnetic resonance (NMR) analysis is one of the key exploration and analysis techniques in unconventional oil and gas exploration. It provides continuous high-resolution information on rock core porosity, permeability, and fluid saturation. However, due to its large measurement sensitivity area, signals from different positions overlap, resulting in a significantly lower vertical resolution compared to instrument sampling. This limitation hinders its effectiveness in detecting thin interbedded reservoir. To improve the vertical resolution of the full-diameter core NMR measurements, the measured data were modeled as the convolution of the instrument's sensitivity area function and the core's real signal. High-resolution reconstruction of the original signal was achieved using global non-negative least squares, without changing the existing instrument structure or measurement mode. The feasibility of this method was validated through numerical simulations, physical experiments, and actual data analysis. Practical applications show that the high-resolution processed NMR porosity from well logging aligns more closely with gas-filled porosity. This method significantly improves the vertical resolution of full-diameter core NMR measurements, enhancing the detection capabilities for thin interbedded reservoirs.

油气资源与勘探技术教育部重点实验室(长江大学)开放基金资助项目 PI2023-03

https://doi.org/10.11781/sysydz2025040904