物探技术在肃州区地热勘查中的应用研究

发布时间：2018-06-08 21:27

本文选题：地热勘查 + 地球物理勘探　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：地球物理勘探是深部地热资源调查的重要手段之一。根据现场地形、地质条件,本论文面临探测深度大、干扰噪声强、要求精度高的挑战,单一的地球物理方法很难准确定位预测矿体的产出及赋存状态,需综合利用物探方法,相互约束,相互补充,才能取得良好的找矿效果[1]。前期依据区域航磁异常布设高精度磁测剖面,继而布设高精度重力剖面测量,反演确定区域基底的划分[1];后期进行瞬变电磁剖面测深和可控源音频大地电磁剖面测深,进行地层岩性电性划分,确定中新生代盆地边缘基底埋深、断裂构造位置、产状及热储的分布范围和深度。推断出具有圈定地热资源最佳开发地段,为确定地热钻探孔位布设提供地球物理依据。通过对勘查区的实地调查,结合区域地质资料、研究成果,对物探数据进行了综合分析研究,推断出了 F1、F2和F8三条具有较好成热前景的主要断裂构造带,并判断此3条断裂带地热成热条件成熟,提出了地热钻孔试验孔位布设建议,达到了本次勘查的目的。
[Abstract]:Geophysical exploration is one of the important means of deep geothermal resources investigation. According to the field topography and geological conditions, this paper is faced with the challenge of high detection depth, strong noise interference and high precision. It is difficult for a single geophysical method to accurately locate and predict the occurrence and occurrence of orebodies, so it is necessary to make comprehensive use of geophysical methods. In order to obtain good prospecting effect, mutual restraint and mutual supplement can be achieved. According to the regional aeromagnetic anomalies, high precision magnetic profiles are arranged in the early stage, and then high precision gravity profile measurements are arranged to determine the division of the regional basement [1], the transient electromagnetic profile sounding and the audio magnetotelluric profile sounding with controllable sources are carried out in the later stage. Stratigraphic lithologic electrical division is carried out to determine the basement depth of Mesozoic and Cenozoic basin margin, the location of fault structure, the distribution range and depth of occurrence and heat storage. It is inferred that the best exploitation area of geothermal resources is delineated, which provides geophysical basis for determining the location of geothermal drilling holes. Based on the field investigation of the exploration area, combined with the regional geological data and the results of the research, the geophysical data were comprehensively analyzed and studied, and the three main fault structural zones of F1, F2 and F8 with good thermal potential were inferred. Based on the judgement of the maturity of geothermal formation conditions in these three fault zones, suggestions for the placement of test holes in geothermal boreholes are put forward, and the purpose of this exploration is achieved.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631;P314

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