大柏舍深井地电阻率观测布极方式分析

doi:10.13278/j.cnki.jjuese.20170270

Abstract

Abstract: In order to evaluate the quality of observation,we interpreted the horizontally layered homogeneous medium model of Dabaishe station according to the electric sounding data. The measurement arrays at the station are the fixed Schlumberger arrays. The deep-well measurement has two set of arrays. One was horizontally placed shorter than 100 meters, and the other was vertically arranged. Under the layered model, we analyzed the sensitivity coefficient variations of deep-well apparent resistivity measurement versus the different electrode depth and the spacing of current electrodes. The results show that the horizontal deep-well measurement has strong ability on inhibiting from surface disturbances. However, its current electrodes spacing is relatively short, only 60 meters, thus the measurement data didn't effectively reflect the resistivity variations from deep mediums. The electrodes of the vertical deep-well measurement array is located within the layer where underground water level changes; therefore, its measurement data suffer a strong affection from water level variations, and it is very difficult to distinguish the resistivity variations of deep mediums from the data. In order to better detect the information associated with earthquakes, the spacing of horizontal arrays of AB/2 should be set as 250-350 m, and the bury depth should exceed 150 m. A horizontal array along NS direction is also recommended for a better result.

Key words: apparent resistivity, deep-well measurement, fixed Schlumberger arrays, sensitive coefficient, Dabaishe station

CLC Number:

P631.4

Ning Yaling, Xu Jiashu, Xie Tao, Zhang Guoling, Lu Jun. Analysis on Deep-Well Apparent Resistivity Measurement at Dabaishe Seismic Station[J].Journal of Jilin University(Earth Science Edition), 2018, 48(2): 525-533.

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Analysis on Deep-Well Apparent Resistivity Measurement at Dabaishe Seismic Station

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