Borgia G C, Bortolotti V, Dattilo P, Fantazzini P, Maddinelli G
University of Bologna, Dept. of ICMA, Italy.
Magn Reson Imaging. 1996;14(7-8):919-21. doi: 10.1016/s0730-725x(96)00182-8.
The local determination of porosity is an extremely valuable target because of different applications in petrophysics. In fact, obtaining a reliable profile of porosity or saturations could considerably improve the evaluation of transport properties of porous media, especially if applied to multiphase flow test (i.e., for relative permeability characterisation). However, the best procedure to adopt for these kind of studies is currently under debate, involving different experimental choices both for acquisition and hardware solutions. The choice of a reliable procedure could be particularly important especially if heterogeneous samples (i.e., vugular or fractured carbonates) are approached. We have investigated selected carbonate cores, characterised by fractures and large vugs, using different instrumental solutions in order to assess usefulness of application of NMR imaging methods as a porosity measurement tool for heterogeneous samples. Local porosity data have been obtained and discussed relative to conventional measurements and petrographical aspects of rock samples.
由于在岩石物理学中有不同应用，孔隙度的局部测定是一个极具价值的目标。事实上，获得可靠的孔隙度或饱和度剖面可以显著改善对多孔介质传输特性的评估，特别是应用于多相流测试时（即用于相对渗透率表征）。然而，目前对于这类研究应采用的最佳程序存在争议，涉及采集和硬件解决方案方面的不同实验选择。如果处理非均质样品（即孔洞或裂缝性碳酸盐岩），选择可靠的程序可能尤为重要。我们使用不同的仪器解决方案对选定的具有裂缝和大孔洞特征的碳酸盐岩岩心进行了研究，以评估核磁共振成像方法作为非均质样品孔隙度测量工具的应用有效性。已经获得了局部孔隙度数据，并相对于传统测量和岩石样品的岩相学方面进行了讨论。
