山东省临清坳陷区岩溶热储地热能潜力分析

山东省临清坳陷区内埋藏有巨厚的寒武系—奥陶系碳酸岩地层,是地热开发的有利目标层位。在石油勘探过程中取得的地震解译与钻探成果基础上,综合前人的研究成果,编制了区内新生界平均地温梯度图及奥陶系顶板埋深等值线图,采用地温梯度计算公式估算了奥陶系顶板地层的温度。结合寒武系—奥陶系地层厚度的空间分布情况,以奥陶系顶板处120 ℃作为地热资源量计算分区的起算温度,并以90 ℃作为地热资源利用的下限温度,对地热发电的前景进行了预测。结果表明,区内岩溶热储地热资源开发利用前景广阔,可用于发电的地热资源量为1.27×10¹⁵ MJ,折合电能1.35×10⁵ MW,其中240 ℃高温区的地热资源就能满足区内供电需求。

Geothermal energy potential analysis of karst reservoir in Linqing depression of Shandong Province

There are thick carbonate strata of Cambrian-Ordovician buried at Linqing depression in Shandong Province, which are a favorable target for geothermal exploitation. Based on the seismic interpretation and drilling results obtained during petroleum exploration, and by comprehensively analyzing the results of previous studies, the authors compiled the average geothermal gradient map of Cenozoic and the contour map of Ordovician burying depth, and adopted temperature gradient estimation formula for the strata temperature calculation of Ordovician roof. Combined with the Cambrian-Ordovician strata thickness distribution, and using the temperature of 120 ℃ at the Ordovician roof as the beginning temperature and 90 ℃ as the lowest temperature, the authors predicted the prospect of geothermal power generation. The results show that the geothermal resources in the karst reservoir are really prospective, and the total heat resource that can be used for geothermal power plant is 1.27×10¹⁵ MJ, which is equivalent to 1.35×10⁵ MW of electricity power. And the heat resource contained in the 240 ℃ high temperature area can meet the requirements of power supply in this region.