高分辨率核磁共振录井技术进展及前景展望

Progress and prospect of high resolution nuclear magnetic resonance logging technique

低场核磁共振技术助推录井实现了对岩石孔隙结构及孔隙流体的物性量化评价,但钻井工艺技术的进步及非常规油气勘探的发展,使核磁共振录井的检测对象从常规储集层拓展到钻井液及泥页岩储集层,并对流体分辨率及孔喉分辨率提出了更高的要求。为此,研发了钻井液核磁共振在线录井仪及小型化三维核磁共振录井仪,建立了荧光钻井液体系下的地层含油性评价方法及泥页岩核磁共振评价方法,在有效解决荧光钻井液条件下油层、低气油比油层及页岩油气层识别与评价难题的同时,也在一体化核磁共振录井仪研发、天然气水合物评价、岩心驱替过程可视化、钻井液材料性能评价、泥页岩水化损伤机理、水泥浆固化过程研究等领域,展现出核磁共振录井技术广阔的发展空间。

The nuclear magnetic resonance(NMR)technique with low magnetic field facilitates mud logging industry to realize the quantitative evaluation on the physical properties of rock pore texture and pore fluid,however,with the development of drilling technology and the unconventional oil and gas exploration,the object of NMR logging is extended from conventional reservoir to drilling fluid and mud shale reservoirs,and the higher requirements were put forward to the fluid resolution and pore throat resolution.Therefore,drilling fluid NMR on-line logging unit and the miniaturized three-dimensional NMR logging instrument have been developed.The evaluation method of formation oil content and the evaluation method of mud shale NMR under the fluorescence drilling fluid system are established.At the same time of effectively solving the identification and evaluation problems of oil layers,low gas-oil ratio oil layers and shale hydrocarbon reservoirs under the condition of fluorescence drilling fluid,a broad space for the progress of NMR logging technology has been shown in the fields of NMR research and development of integrated NMR logging unit,natural gas hydrate evaluation,core displacement process visualization,drilling fluid material performance evaluation,mud shale hydration damage mechanism,study on cement slurry curing process etc.