Design and application of the ultrasonic imaging logging system for deep carbonate geothermal reservoirs
ZHANG Jian-Wei1,2(), YANG Zhuo-Jing1(), WANG Xin-Jie1,2, LI Sheng-Tao1, ZHAO Yu-Jun1
1. Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Baoding 071051, China 2. Innovation Centre of Geological Environment Monitoring Engineering Technology, Ministry of Natural Resources, Baoding 071051, China
Geothermal resources are widely distributed in the Beijing-Tianjin-Hebei region and the Xiong'an New Area and are mainly characterized by deep carbonate geothermal reservoirs. To achieve stable and increased production of geothermal reservoirs, it is effective to detect and evaluate the fracture parameters of reservoirs and analyze the distribution patterns of tectonic fractures in underground rock masses using the ultrasonic imaging logging technique. Targeting the high-temperature and high-pressure environment of deep carbonate geothermal reservoirs, this study developed an ultrasonic imaging logging system, which can be used under the conditions of well depth greater than 4,000 m, well diameter of 150~500 mm, temperature greater than 110℃, continuous operating time greater than 12 h, and pixels per meter of a geological well greater than 50,000. The equipment of this ultrasonic imaging logging system has been tested in well D22 in Xiong'an New Area. The test results show that the developed ultrasonic imaging logging system has a clear imaging effect and high identification degree of fractures and that its various performance indicators are comparable to those of advanced foreign equipment. Therefore, this system can provide an efficient technical method for identifying fractures and fractured zones and analyzing the occurrence of deep carbonate geothermal reservoirs.
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ZHANG Jian-Wei, YANG Zhuo-Jing, WANG Xin-Jie, LI Sheng-Tao, ZHAO Yu-Jun. Design and application of the ultrasonic imaging logging system for deep carbonate geothermal reservoirs. Geophysical and Geochemical Exploration, 2022, 46(6): 1500-1506.
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