ACQUISITION OF LABORATORY EQUIPMENT FOR THE MEASUREMENT OF MAGNETIC SUSCEPTIBILITY

1029118骑士这笔赠款支持购买设备，以测量准备好的实验室样品和岩心样品的磁化率。将购买的具体设备包括巴廷顿磁化率计、巴廷顿双频传感器、巴廷顿岩心测井传感器、ASC手动岩心轨道和数字卷尺。该设备将补充斯坦福PIS实验室现有的质子核磁共振仪器。该设备将支持用标准测井核磁共振仪器测得的氢(1H)核的自旋-自旋弛豫时间常数与用地面核磁共振(SNMR)野外仪器测得的自旋-自旋弛豫时间常数之间的关系及其与未被盐化含水层饱和带中地下物质的水力传导性(K)的关系的研究。长期以来，井下核磁共振测井一直被用来估计地层的渗透率，测得的松弛时间常数与孔喉长度尺度之间的关系已经建立了很好的理论基础。相反，SNMR测量的松弛时间常数与K之间的关系尚不清楚，但SNMR测量的松弛时间常数与井下测量的松弛时间常数之间的联系与靶层中磁性矿物的磁化率有关。如果PI能够开发一种将SNMR测量与K相关联的算法，则可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/EAR研究，以解决使用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.***