ACQUISITION OF LABORATORY EQUIPMENT FOR THE MEASUREMENT OF MAGNETIC SUSCEPTIBILITY

1029118 knight这笔拨款支持购置设备，以测量制备的实验室样品和核心样品的磁化率。要获得的具体设备包括巴丁顿磁化率计，巴丁顿双频传感器，巴丁顿岩心测井传感器，ASC手动岩心轨迹和数字卷尺。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。该设备将支持研究使用标准核磁共振测井工具和使用地面核磁共振（SNMR）现场仪器测量的氢核（1H）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导电性(K)之间的关系。井下核磁共振测井在石油工业中用于储层渗透率的估计已经很长时间了，所测弛豫时间常数与孔喉长度尺度之间的关系已经有了很好的理论基础。相比之下，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目标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，则可以广泛应用于地下水含水层的快速评估，从而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，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.***