LaTorraca G A, Dunn K J, Webber P R, Carlson R M
Chevron Petroleum Technology Co., La Habra, CA 90631, USA.
Magn Reson Imaging. 1998 Jun-Jul;16(5-6):659-62. doi: 10.1016/s0730-725x(98)00030-7.
Low-field (< 50 mT) nuclear magnetic resonance (NMR) well-logging measurements are beginning to be used to obtain estimates of oil viscosity in situ. To build an interpretive capability, we made laboratory T1 and T2 relaxation measurements on a suite of high-density, high-viscosity crude oils. These measurements were also used to estimate oil viscosity and water fraction from T1 and T2 measurements on stable, water-in-oil emulsions. High-density, high-viscosity oils have components that relax faster than can be measured by nuclear magnetic resonance logging tools. This requires corrections to T2 logging measurements for accurate estimates of oil saturation and porosity.
低场（<50 毫特斯拉）核磁共振（NMR）测井测量正开始用于获取原地原油粘度的估计值。为建立解释能力，我们对一组高密度、高粘度原油进行了实验室 T1 和 T2 弛豫测量。这些测量还用于根据对稳定的油包水乳液的 T1 和 T2 测量来估计油粘度和含水率。高密度、高粘度油具有一些成分，其弛豫速度比核磁共振测井工具所能测量的速度更快。这就需要对 T2 测井测量进行校正，以准确估计油饱和度和孔隙度。
