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Detection of Deep Water Courses in Layered Media Using Underground Geophysical Methods

By
Yi Yongsen
Yi Yongsen
Institute of Geophysical and Geochemical Exploration, Ministry of Geology and Mineral Resources, Langfang, Hebei
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Published:
January 01, 1989

Abstract

Many coal mines in north China have been threatened historically by Ordovician limestone water under the coal measures. The key point to solving this problem is to locate the watercourses. The two examples given describe the application of underground geophysical methods to detecting deep water courses buried in layered media. The methods used include (1) the cross-borehole electromagnetic wave method (apparent attentuation coefficient measurement), (2) electromagnetic wave logging, and (3) high-precision borehole temperature measurement. The JWQ-3 and JWQ-3A electromagnetic wave meters for logging and cross-borehole measurement designed and manufactured by the Institute of Geophysical and Geochemical Exploration were used to transmit and receive the electromagnetic waves. The operation frequencies are 0.5, 1.0, 2.0, 4.0, 8.0, 16.0, and 32.0 MHz. For temperature measurements, two kinds of digital borehole thermometers are used in the study, with precisions of 0.05°C and 0.2°C and resolutions of 0.0001°C and 0.01°C, respectively.

In Fengfeng 4 Mine, Hebei province, the location of a vertical watercourse was detected accurately by means of the cross-borehole electromagnetic wave method and high-precision borehole temperature measurements. The watercourse was then blocked with cement injection and the water table in the whole mine was decreased by more than 90 m and the recoverable coal reserve of 9.16 million tons was saved. A watercourse in a flooded mine was located in Longquan Mine, Shandong Province using underground geophysical methods. Waterflow of 14.27 t/ min was reduced to 0.15 t/min. and enabled the flooded mine to resume production.

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Contents

Society of Exploration Geophysicists Geophysical References Series

An Overview of Exploration Geophysics in China — 1988

Zhao Jingxiang
Zhao Jingxiang
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Wang Yanjun
Wang Yanjun
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Fu Xuexin
Fu Xuexin
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Stanley H. Ward
Stanley H. Ward
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Society of Exploration Geophysicists
Volume
3
ISBN electronic:
9781560802662
Publication date:
January 01, 1989

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