ACQUISITION OF LABORATORY EQUIPMENT FOR THE MEASUREMENT OF MAGNETIC SUSCEPTIBILITY

1029118 Knight该补助金支持购买设备，以测量制备的实验室样品和岩心样品的磁化率。 拟购置的具体设备包括一台巴丁顿磁化率仪、巴丁顿双频传感器、巴丁顿岩心测井传感器、ASC手动岩心跟踪器和一台数字卷尺。 该设备将补充斯坦福大学PIs实验室现有的质子核磁共振仪器。 该设备将支持调查用标准测井核磁共振工具激发的氢（1H）核的核磁共振测量自旋-自旋弛豫时间常数与地面核磁共振（SNMR）现场仪器测量的自旋-自旋弛豫时间常数之间的关系，以及它们与未固结含水层饱和区地下物质的水力传导率（K）之间的关系。 井下核磁共振测井在石油工业中长期用于估计地层的渗透率，并且测量的弛豫时间常数与孔喉长度尺度之间的关系的理论基础已经很好地建立。 相比之下，SNMR测量的弛豫时间常数和K之间的关系知之甚少，但SNMR测量的弛豫时间常数和井下测量的弛豫时间常数之间的联系与目标层位中磁性矿物的磁化率有关。 如果PI能够开发出一种算法，将SNMR测量值与K值联系起来，则可以广泛应用于地下水含水层的快速评估，并对水资源管理产生影响。 该设备将立即支持PI资助的NSF/PNAS研究，该研究解决了使用SNMR估计K的可能性。

1029118KnightThis grant supports acquisition of equipment to measure the magnetic susceptibility of prepared laboratory samples and core samples. Specific equipment to be acquired includes a Bartington Magnetic Susceptibility Meter, Bartington Dual Frequency Sensor, Bartington Core Logging Sensor, ASC manual core track, and a digital tape measure. The equipment will complement existing proton nuclear magnetic resonance instruments in the PIs lab at Stanford. The equipment will support investigations of the relationship between NMR measured spin-spin relaxation time constants of Hydrogen (1H) nuclei stimulated using standard well logging NMR tools and those measured with surface NMR (SNMR) field instruments and their relationship with the hydraulic conductivity (K) of subsurface materials in the saturated zone of uncosolidated aquifers. Down hole NMR logging has long been used in the petroleum industry to estimate the permeability of formations and the theoretical basis for the relationship between the relaxation time constant measured and pore throat length scale is well established. In contrast, the relationship between the relaxation time constant measured by SNMR and K is poorly understood but the linkage between the SNMR measured relaxation time constant and that measured down hole is related to the magnetic susceptibility of magnetic minerals in the target horizon. Should the PI be able to develop an algorithm for relating SNMR measurements to K there could be wide spread applications for rapid assessment of groundwater aquifers with implications for water resource management. The equipment would immediately supported PI funded NSF/EAR research that addresses the possibility of using SNMR for estimating K.***