全直径油气储层岩心三维可视化信息采集方法及应用前景

在微米X-CT基础上，通过对X射线强度的调整和扫描方式的更新，建立了Geoscan系列，并相应将样品室改装成了平放式加长扫描区，实现了对全直径岩心进行三维扫描成像。测试结果显示，以往难以描述的岩心断面构造、层理结构、非均态构型、孔—缝展布等全直径三维参数信息均能得到清晰的三维图像，有效拓宽了地学领域微观分析的视野。通过对石油钻井岩心全直径扫描，可以实现在一个较为宽泛的深度段内，观察分析不同矿物组分的含量变化、油气运移轨迹以及缝隙的延展性等重要参数信息，通过对储层物性参数数字化处理的图像可直接反映油气聚集的有效性及储集空间展布规律。这项技术将通过提供储集岩孔—渗架构三维可视化网格图和给予的储层品质定性结论来指导优化油区勘探部署。 

Technique and application of three-dimensional visualized information collection of full diameter oil and gas reservoir cores

Geoscan series was established by means of X-ray intensity adjustment and scanning way update based on the micro X-ray computed tomography (CT). Sample room was converted to a flat type to extend scanning area, which realized the 3D scanning imaging of full diameter cores. Test results showed that the 3D parameters of full diameter, including core section structure, bedding structure, heterogeneous configuration and hole-seam distribution, could be used to get clear 3D images, which was difficult to describe in the past. Through the full diameter scanning of drilling cores, we analyzed the mineral content, hydrocarbon migration pathway and aperture ductility in a more extensive depth. The digital processing images of reservoir property parameters can reflect the effectiveness of hydrocarbon accumulation and the reservoir distribution rules. This technology provides a 3D visual image for the porosity and permeability of reservoir rocks and a qualitative evaluation of reservoir quality, which may optimize hydrocarbon explorations.