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| THE APPLICATION OF THE ELECTROMAGNETIC FLOW RATE LOGGING |
| AN Zhen |
| No. 153 Exploration Party, Inner Mongolia Bureau of Coal Geology, Hohhot 010010, China |
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Abstract The basic principle, measuring method, data acquisition way and data processing and interpretation method are described comprehensively in this paper, which helps understand in detail the practical application of the electromagnetic flow rate logging instrument. During the mixed pumping (injection) test in hydrogeological exploration, the performance of the electromagnetic flow rate logging can acquire the data obtained by stratified pumping (injection). The essence of the electromagnetic flow rate logging lies in measuring the induction data of the flow velocity, which can be divided into the natural static state standing water level measurement and the pumping (injection) dynamic standing water level measurement, and the measurement ways include continuous measurement and point measurement. The principles of qualified, depth-determining and thickness-determining interpretation are as follows: On the basis of the base value of the instrument, the increase of the amplitude indicates the water gushing bed, the decrease of the amplitude signifies the water absorbing bed, and the invariant amplitude means the confining bed; the inflection point of the curve variation is the reflection of the interface and determines the depth and thickness. During the calculation of the water yield, we should first determine the sensitivity of the instrument in the hole, obtain the velocity value through the reflection value of the aquifer roof, and calculate the water-carrying sectional area of the water drill hole, so as to compute the water yield.
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Received: 30 November 2012
Published: 10 February 2014
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