山东省东明地热田地球物理化学特征分析

Analysis of Geophysical and Geochemical Features in Dongming Geothermal Field,Shandong Province

山东省东明地热田内蕴藏着丰富的地热资源。通过已有地质资料及近年的勘查项目研究成果,对东明地热田的地热资源的地质背景、热储特征、地球物理化学特征等进行了研究分析,认为东明地热田属于层控型低温地热田,热储层主要为新近纪明化镇组下部、馆陶组、古近纪东营组地层,该区的地温梯度主要受构造控制,断裂导热是形成该地温场的一个重要因素,地下热水水平方向水化学组分变化甚微,具有明显的垂直分带性,地热水水源主要为渗入的溶滤水。

Geothermal resource is very rich in Dongming geothermal field of Shandong Province. Based on the geological data resent years, the author synthetically analyses geological background, heat reservior characteristic, geophysical and geochemical characteristic, and thinks that Dongming geothermal field is a stratabound low temperature geothermal field. The hot reservoir is mainly composed of the lower part of Minghuazhen Formation and Guantao Formation in Neogene period and Dongying Formation in Paleogene period. The geothermal gradient in this area is controlled mainly by the structure. The structure heat conduct is a key factor of this geotemperature field formation. The horizontal chemical component diversification in the geothermal water is tiny. But it is very obvious in the vertical direction. Geothermal water mainly originates from permeation lixiviation water.