THE POTENTIAL OF A NOISE-REDUCING ANTENNA FOR SURFACE NMR GROUNDWATER SURVEYS IN THE EARTHS MAGNETIC-FIELD

被引：94

作者：

TRUSHKIN, DV ^{[1
]}

SHUSHAKOV, OA ^{[1
]}

LEGCHENKO, AV ^{[1
]}

机构：

[1] RUSSIAN ACAD SCI,INST CHEM KINET & COMBUST,NOVOSIBIRSK 630090,RUSSIA

来源：

GEOPHYSICAL PROSPECTING | 1994年 / 42卷 / 08期

关键词：

D O I：

10.1111/j.1365-2478.1994.tb00245.x

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A method of non-invasive NMR in the earth's field has been developed and is now used for groundwater surveys to depths of investigation of 100 m or more. A circular wire loop of diameter 100 m, laid out on the ground, is employed to excite and receive the NMR signal in the earth's field. However, in areas with high electromagnetic noise, the NMR measurements may be inaccurate. To overcome this problem, a noise-reducing figure-of-eight-shaped antenna, consisting of two touching coils each of diameter 50 m, has been utilized. Using this antenna, the NMR signal has been calculated for different depths of water-saturated layers with various inclinations of the geomagnetic field. The model calculations and experimental data have been compared and found to be mutually consistent. The two-coil antenna is shown to be suitable for studies at depths of up to 30-40 m, which is of practical importance for engineering geology.

引用

页码：855 / 862

页数：8