期刊
JOURNAL OF GEOPHYSICS AND ENGINEERING
卷 14, 期 6, 页码 1413-1419出版社
IOP PUBLISHING LTD
DOI: 10.1088/1742-2140/aa7ffe
关键词
borehole temperature logging; geothermal gradient; four-wire method
资金
- Marmara University BAPKO [FEN-A-100413-0127, FEN-C-YLP-110915-0437, FEN-C-YLP-091116-0499, FEN-E-120314-0066, FEN-C-YLP-090414-0102, FEN-L-250416-0180]
- Scientific and Technological Research Council of Turkey (TUBITAK) [113R019]
High-quality temperature-depth information from boreholes with a depth of 100 m or more is used in geothermal studies and in studies of climate change. Electrical wireline tools with thermistor sensors are capable of measuring borehole temperatures with millikelvin resolution. The use of a surface readout mode allows analysis of the thermally conductive state of a borehole, which is especially important for climatic and regional heat flow studies. In this study we describe the design of a portable temperature logging tool that uses the four-wire resistance measurement method. The four-wire method enables the elimination of cable resistance effects, thus allowing millikelvin resolution of temperature data at depth. A preliminary two-wire model of the system is also described. The portability of the tool enables one to collect data from boreholes down to 300 m, even in locations with limited accessibility.
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