长江新城区地层结构特征研究——以武城调深井1号钻井为例  

Study on stratigraphic structure characteristics of The Yangtze River Demonstration District——A case study of ZK001

作　　者：陈葛成 CHEN Gecheng(Hubei Coal Geological Survey Institution,Wuhan 430000,Hubei,China)

机构地区：[1]湖北煤炭地质勘查院,湖北武汉430000

出　　处：《矿产勘查》2024年第S2期193-200,共8页Mineral Exploration

基　　金：长江新城多要素城市地质调查(WHDYS-2018-002、ZSHJ-WHS-FW-2019-052)资助。

摘　　要：为了实现武汉市委市政府提出的建设长江新城区规划建设目标,本文通过已实施的武汉市首个千米钻孔,对长江新城区地下空间地层结构进行研究。通过对揭露出来的第一手岩心资料进行详细的岩相学、岩石学研究,厘清研究区地层结构、沉积构造演化及地热能特征。首先,公安寨组属于冲积扇、辫状河沉积体系,发育扇根亚相-河道沉积和扇中-扇缘亚相之泥石流沉积、漫流沉积和辫状河道沉积等;其次,厘清本区喷出岩特征,划分7个火山旋回;最后,发现本区平均地温梯度为3.37℃/100 m,上部红层段(27~421.6 m)地温梯度为2.85℃/100 m,岩浆岩段(421.6~663.5 m)地温梯度为4.10℃/100 m(相对较高),下部红层段(663.50~1012.56 m)地温梯度为3.10℃/100 m,具有良好的地热能潜力。In order to achieve the planning and construction goals of building the new urban area of the Yangtze River put forward by the CPC Wuhan Municipal Committee and the Wuhan Municipal Government,this paper conducts research on the underground space stratigraphic structure of the new urban area of the Yangtze River through the first kilometer bored pile implemented in Wuhan.By conducting detailed petrographic and petrological studies on the first-hand core samples exposed,the paper clarifies the stratigraphic structure,sedimentary tectonic evolution,and geothermal energy characteristics of the study area.Firstly,the Gonganzhai Formation belongs to the alluvial fan and braided river sedimentary system,and is characterized by the sub-phase of the river channel sedimentation and the deposition of mudflow sediment,flood sediment,and braided river sedi-ment in the sub-phase of the fan root and the sub-phase of the fan middle and edge.Secondly,the paper clarifies the characteristics of the volcanic eruption and divides the study area into seven volcanic cycles.Finally,the paper finds that the average ground temperature gradient in the study area is 3.37℃/100 m,the ground temperature gradi-ent in the upper red bed section(27-421.6 m)is 2.85℃/100 m,the ground temperature gradient in the igneous rock section(421.6-663.5 m)is 4.10℃/100 m(relatively high),the ground temperature gradient in the lower red bed section(663.50-1012.56 m)is 3.10℃/100 m,and has good geothermal energy potential.

关 键 词：长江新城区 地层结构 沉积构造演化 地热能 

分 类 号：P586[天文地球—岩石学]