Characterization of Fractures and Multiphase Flow in Fractured Permeable Rocks Using Nmr Imaging Techniques
نویسندگان
چکیده
A new noninvasive method is presented for laboratory characterization of fractures in permeable media using relaxation-weighted NMR imaging techniques. The method is based on the fact that relaxation rates in fractures and those in surrounding porous matrix are substantially different. Thus, by selectively suppressing imaging signals from either fractures or porous matrix, one can highlight fluid distributions in either of these regions so that fractures can be unambiguously identified and surrounding porous structures can be characterized. The advantages over conventional NMR spin-echo imaging are demonstrated. We also demonstrate that the technique can be used to speed acquisitions of images of fluid distributions in porous matrix. In addition, a two-phase displacement experiment was conducted to investigate transport features related to fractured systems.
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تاریخ انتشار 2003