Design and application of the ultrasonic imaging logging system for deep carbonate geothermal reservoirs
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摘要: 京津冀地区和雄安新区地热资源分布广泛,以深部碳酸盐岩热储层为主要特征。为了实现热储稳产、增产,采用超声波成像测井技术对储层裂缝参数进行检测、评价,分析地下岩体构造裂缝的分布规律,是非常有效的手段。本文针对深部碳酸盐岩热储层高温、高压的应用环境,研发了超声成像测井系统,满足了井深在4 000 m以深、井径150~500 mm、温度达到110 ℃以上、连续工作时间12 h以上、每米井段像点数大于5万点的使用要求。整装设备在雄安新区D22井进行了测井试验,结果表明:所研制的超声成像测井系统成像效果清晰、裂缝识别度高,各项性能指标均达到国外同类先进设备水平,能够为深部碳酸盐岩热储层的裂缝、破碎带识别以及产状分析提供一种高效的技术手段。Abstract: 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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