利用核磁共振T1-T2谱技术研究页岩油可动性

摘要

基于核磁共振T1-T2相关谱技术,建立核磁共振响应特征与岩石热解参数的联系.利用初步建立的划分标准提取岩石样品核磁共振响应中的各组分信号,得到核磁共振T1-T2谱中各组分信号与对应的地化参数之间呈现正相关关系,而其中可动有机质信号强度与各样品的含油性指数(S1/TOC×100)同样表现出极好的线性关系,说明核磁共振技术在表征泥页岩有机质含量方面具有可行性.经过干酪根提取以及热解参数计算后,量化得到松辽盆地北部地区页岩油可动下限约为S1/TOC×100=102.36 mg/g.%Based on NMR T1-T2 correlation spectroscopy technique, the relationship between NMR response characteristics and rock pyrolysis parameters was established.Using an established criteria with extracting the signal of the NMR response of rock samples, a positive correlation between the signal of each component in the T1-T2 spectrum and the geochemical parameters was obtained.While the signal intensity of mobile organic matter also shows a good linear relationship with the oil content index of each sample(S1/TOC·100), it means that the NMR technology is feasible in the characterization of the organic matter content of shale.After the extraction of kerogen and the calculation of pyrolytic parameter, the movable lower limit of shale oil in northern Songliao Basin was quantified as S1/TOC×100=102.36 mg/g.