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| Integrated geophysical exploration in northeast Fengheying geothermal field,Beijing |
| LEI Xiao-Dong1, 2, YANG Quan-He2, LI Chen2, DU Li-Na2, SHI Han-Jing2, HE Yi2 |
1.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;
2.Beijing Institute of Geo-exploration Technology,Beijing 102218,China |
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Abstract The Fengheying geothermal field,located in the southeast of Tongzhou District of Beijing with an area of 262.51 km2,is one of the top ten major geothermal fields in Beijing plain.The northeast of the geothermal field is a blank area for geothermal resource exploration and development.In order to reveal the geological conditions of this area,the authors carried out 7 km2 gravity survey,4 km controlled source audio-frequency magnetotelluric sounding survey in profiles,and 2 points microtremor.All the geophysical prospecting interpretation results consistently show that a secondary fault of Xiadian fault is developed in Xiji Town.The fault is nearly EW-striking and the fault planes dip southward at 75 °,with the displacement more than 1 km.It is inferred that the further favorable targets for exploration and development of geothermal resources might be on the south side of this fault where the fault may form a good channel for deep hot water,and the water reservoir cap is relatively thick.On the basis of the geophysical results,a exploratory hole was drilled in the favorable targets area,with depth 3588.88 m,water flow 3072.64 m3/d and temperature 92℃.Water quantity and temperature of this hole have all achieved economic mining conditions.All researches show that the northeastern area of the Fengheyin goethermal field has good potential for medium-low temperature geothermal resources.
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Received: 09 May 2016
Published: 10 April 2017
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