Characteristics of Geothermal Reservoir/Cap Rock and Fluid Chemical Characteristics of Minghuazhen Formation in Northwestern Shandong Province
Based on the work of geothermal exploration,geothermal reservoir water geochemistry and comprehensive mapping in the geothermal area of northwest Shandong,the characteristics of geothermal reservoir/cover rock of Minghuazhen Formation in northwest Shandong were studied.The research shows that the thermal reservoir in the study area is mainly a layered thermal reservoir,and the ground temperature is uniform compared with other geothermal areas,aquifer with high heat flow value and strong water abundance,which is the area with the greatest potential for geothermal resource development in Shandong Province.The upper part of Minghuazhen Formation develops variegated sandy clay,sandy mudstone,mudstone,siltstone and fine sandstone.Sandy mudstone,mudstone,fine sand and medium-fine sandstone are developed in the lower part.The general distribution law is that the thickness becomes thinner from west to east.In the uplift area,the burial depth is shallow and the thickness is thin.In the depression area,the burial depth is deep and the thickness is large.The distribution law of thermal reservoir is that the buried depth of roof is about 500 m,the buried depth of floor is 500～1 100 m,the deepest depth of local area can reach 1 300 m,the thickness of thermal reservoir is generally 30～120 m,the thickness of thermal reservoir in convex area is small,and the thickness of the thermal reservoir in depression area is large.The Neogene Minghuazhen Formation is regarded as a relative thermal reservoir cover rock with a thickness of 970～1 130 m.The lithology is composed of cohesive soil and sandy soil.It has low density,poor thermal conductivity and large thermal resistance.It is a natural good thermal reservoir insulation layer.
Minghuazhen Formationgeothermal reservoirgeothermal coveringnorthwest of Shandong Province
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