西安市临潼区渭水曲项1-1井储层特征与地热资源评价

Geothermal Deposit Features and Geothermal Resource Assessment of Geothermal Well 1-1 at Quxiang in Lintong District,Xi’an

渭水曲项1-1井位于关中盆地西安凹陷东部渭南断阶构造,揭露蓝田灞河组(N_(2l+b))、高陵群(N_(1gl))、白鹿塬组(E_(3b))以及红河组(E_(2h))四组储层;其中白鹿塬组孔隙度高(31.2%)、热水温度高(91.21℃),为本井最优质储水层,属新生界砂砾岩-砂岩孔隙裂隙层状传导型热储系统。渭水曲项1-1井100年内预计产热量2.35×10^(16)J,相当于标准煤1.35×10^(6)t,折合热能7.35MW。热水中,氟化物、砷、铜含量较高,不适宜作为饮用水、农田灌溉水和渔业用水。氟、偏硼酸、偏硅酸含量达到命名矿水浓度。

Geothermal well 1-1 at Quxiang in Lintong District,Xi’an lies in the Weinan fault-step structure in the east of the Xi’an depression of the Guanzhong basin,through 4 geothermal deposits such as Lantianbahe Formation(N_(2l+b)),Gaoling Group(N_(1gl)),Bailuyuan Formation(E_(3b))and Honghe Formation(E_(2h)).The Bailuyuan Formation(E_(3b))is characterized by high porosity with hot water of 91.21℃,being best geothermal deposit in the well.The Bailuyuan Formation consisting of the Cenozoic glutenite-sandstone is a layered conductive thermal storage system with pores and fractures.The well is expected to produce 2.35×10^(16) j over 100 years,equivalent to 1.35×10^(6) tons of standard coal or 7.35 MW of heat.The geothermal water contains higher fluorides,As,Cu,not suitable for drinking water,farmland irrigation water and fishing water.The content of fluoride,metaboric acid and metasilicate acid reaches the concentration of named ore water.