中国东部主要沉积盆地型热储产出特征与地热开发利用建议

 通过对188口地热井的井口温度和单井产水量的统计分析，初步查明了中国东部主要沉积盆地热储的产能特征。结果表明，中国东部沉积盆地型热储总体上以温热水和热水为产出特征，单井产水量以中、高产为主，总体上热储产能以蓟县系雾迷山组和寒武系-奥陶系最大，其次为新近系明化镇组和馆陶组，其中，岩溶裂隙型热储产能变化较大，表明其具有较强的非均质性。建议东部地区积极开展多元化、梯级化地热利用；在地热开发利用过程中，如果基岩地层埋藏较浅可优先选择蓟县系雾迷山组和寒武系-奥陶系岩溶裂隙型热储作为目的层，同时应加强岩溶裂隙型热储非均质性及其与产能关系的研究；而当基岩地层埋藏较深可考虑新近系馆陶组与明化镇组砂岩孔隙型热储。

Output characteristics of the main sedimentary geothermal reservoirs in the eastern part of China and suggestions on geothermal exploitation and utilization

In recent years, with the situation of air pollution in the eastern part of China becoming a more and more serious concern, the development and the utilization of geothermal resources in this area has been put on the agenda. It is recognized that the wellhead temperatures and the water productions of geothermal wells in different areas are different, and some geothermal wells are characterized by a low temperature or water production, which seriously affects the development of geothermal industry. In order to find out the output characteristics of sedimentary geothermal reservoirs in the eastern part of China, the main sedimentary geothermal reservoirs in this area are initially investigated based on the analysis of the wellhead temperature and the single-well yields of 188 wells, which have been and are being exploited in this area. The results show that the sedimentary geothermal reservoirs in the eastern part of China are characterized by the warm-hot water and the hot water, and dominated by the mediate and high yields, with the Jixian system Wumishan formation and the Cambrian-Ordovician system Karstic and fractured reservoirs having the highest yields, and Neogene system Guantao and Minghuazhen formation sandstone reservoirs having lower yields. Among the reservoirs, the Karstic and fractured reservoirs see a wider variation in yields, suggesting a more heterogeneity. According to the results, several suggestions are made as follows:(1) diversified and stepwise utilization should be actively considered, to make a full use of the efficiency of the geothermal resources; (2) Jixian system Wumishan formation and Cambrian-Ordovician system Karstic fractured reservoirs should be preferentially considered in the geothermal exploitation and utilization, especially in the areas where the basement rocks are shallowly buried; (3) heterogeneity of the Karstic and fractured reservoirs and its relationship with the yields should be studied, in order to find reservoirs with high water production.