CT扫描技术在页岩油气储层微观结构表征中的应用进展

Application progress of CT scanning technology in characterization of shale oil and gas reservoir microstructure

重点论述了CT扫描技术在岩石矿物组分、孔隙结构表征和微裂缝识别三个方面的应用进展。利用不同矿物组分的密度差异可以识别出有机质、黄铁矿和基质矿物等组分,由于一些矿物组分灰度值相近难以精确区分,未来可结合X衍射技术对比识别。实现了岩心内部真实孔喉分布的三维表征,并可进行定性定量的连通性分析。不仅可以识别页岩中发育的天然微裂缝,还可研究不同热解条件下的微裂缝扩展规律。CT扫描已然成为表征页岩油气储层微观结构的有力工具。

This paper focuses on the application progress of CT scanning technology in rock mineral composition,pore structure characterization and microfracture identification.The density difference of different mineral components can be used to identify organic matter,pyrite,matrix minerals and other components.It is difficult to accurately distinguish them due to the similar gray value of some mineral components,so they can be identified by X-ray diffraction technology in the future.The three-dimensional representation of the actual pore throat distribution in the core is realized,and the connectivity analysis can be carried out qualitatively and quantitatively.Not only the natural microfractures developed in shale can be identified,but also the propagation law of microfractures under different pyrolysis conditions can be studied.CT scanning has become a powerful tool to characterize the microstructure of shale oil and gas reservoirs.