Application of comprehensive geophysical exploration in geothermal resources on the eastern margin of Yinchuan Basin
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摘要: 银川盆地东缘天山海世界地热田的发现,揭示了该区域赋存优质地热资源,其成藏地质条件显著有别于盆地内“传导型”地热,为宁夏黄河流域清洁能源的研究提供了新的方向。本文以区域地质、地球物理特征为基础,针对1：5万重力、可控源大地电磁测深与微动测量资料进行处理与分析。研究结果显示:奥陶系基底隆升地带位于灵武凹陷东侧,沿黄河断裂呈“S”形展布,至天山海世界达隆升最高部位,并与NW向局部隆起区叠合;深部储热层奥陶系为中高阻层特征,中部第一盖层石炭系—二叠系表现为中低阻、弱低速层,浅部第二盖层古近系—新近系与低阻、低速层对应。以上述研究成果为基础,预测了3处地热资源开发利用远景区。Abstract: A geothermal field has been discovered in the Tianshan Sea World on the eastern margin of the Yinchuan Basin, revealing that the region has high-quality geothermal resources. The geological conditions for the formation of the geothermal field are significantly different from those of the conduction-type geothermal resources within basins, providing a new direction for the study of clean energy in the Yellow River Basin in Ningxia. This study processes and analyzes the data of 1：50,000-scaled gravity surveys, controlled source audio-frequency magnetotellurics (CSAMT), and microtremor survey based on regional geological and geophysical characteristics. The results of the study are as follows. The uplifting zone of the Ordovician basement lies on the east side of the Lingwu Sag and spreads in an "S" shape along the Yellow River Fault. This zone reaches its highest part in the Tianshan Sea World, where it merges with the NW-trending local uplift. The Ordovician of the deep reservoirs in the geothermal field is characterized by medium-high resistance. The Carboniferous-Permian of the first cap rock at a moderate depth shows medium-low resistance and low seismic velocity. The Paleogene-Neogene of the second shallow cap rock corresponds to the formation with low resistance and low seismic velocity. Using these results, three prospective areas for developing and utilization of geothermal resources have been predicted.
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