地球物理学进展 ›› 2018, Vol. 33 ›› Issue (6): 2278-2284.doi: 10.6038/pg2018BB0484

• 固体地球物理及空间物理学(大气、行星、地球动力学、重磁电及地震学、地热学) • 上一篇    下一篇

宁河凸起地热资源远景区评价分析——来自大地电磁测深法的证据

胥博文1,刘志龙1,*(),叶高峰2,3,4,石峰1,朱怀亮1,张敏5,王兴元1   

  1. 1. 天津地热勘查开发设计院,天津 300250
    2. 中国地质大学(北京)地球物理与信息技术学院,北京 100083
    3. 地下信息探测技术与仪器教育部重点实验室,北京 100083
    4. 地质过程与矿产资源国家重点实验室,北京 100083
    5. 中国石油大港油田公司勘探开发研究院,天津 300280
  • 收稿日期:2018-03-29 修回日期:2018-10-10 出版日期:2018-12-20 发布日期:2019-03-03
  • 通讯作者: 刘志龙 E-mail:237701767@qq.com
  • 作者简介:胥博文,男,1982年生,河南省商丘人,硕士,工程师,从事地热资源勘探开发研究.(E-mail: 15222699756@163.com)
  • 基金资助:
    滨海新区深部地热资源调查评价资助(国土房任[2015]5号)

Evaluation and analysis of geothermal resources in Ninghe uplift—evidence from magnetotelluric method

XU Bo-wen1,LIU Zhi-long1,*(),YE Gao-feng2,3,4,SHI Feng1,ZHU Huai-liang1,ZHANG Min5,WANG Xing-yuan1   

  1. 1. Tianjin Geothermal Exploration and Development-Designing Institute, Tianjin 300250,China
    2. School of Geophysics and Information Technology,China University of Geosciences, Beijing 100083,China
    3. Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083,China
    4. State Key Laboratory of Geological Processes and Mineral Resources, Beijing 100083,China
    5. Exploration and Development Research Institute of PetroChina Dagang Oilfield Company, Tianjin 300280, China
  • Received:2018-03-29 Revised:2018-10-10 Online:2018-12-20 Published:2019-03-03
  • Contact: Zhi-long LIU E-mail:237701767@qq.com

摘要:

“滨海新区深部地热资源调查评价”专项是天津市国土资源和房屋管理局2016年下发给天津地热勘查开发设计院的公益性基金项目,主要目的是查明滨海新区4000 m以浅热储层的地热资源赋存条件,提出滨海新区深部地热资源重点勘查开发前景区.宁河凸起是天津市滨海新区深部地热资源勘查薄弱区,作为此次工作重点区,布置了大量大地电磁测深点.本文对宁河凸起上132个大地电磁测深点进行了系统的分析和处理,获得了宁河凸起5 km以浅三维导电性结构模型.G-B分解结果表明宁河凸起东、西两侧主构造走向具有差异性,宁河凸起西侧主构造走向以北东向为主,受宁河凸起西边界的北东向沧东断裂影响;东侧以东西向为主,受东西向的汉沽断裂影响.一维bostick反演结果可以看出宁河凸起东西向的构造差异;二维反演结果可以显示汉沽断裂发育形态;三维反演结果获得了宁河凸起三维导电性结构模型.三维电性结构模型显示宁河凸起地质构造复杂,既有东西向的差异,又有南北向的差异.结合区域重、磁资料分析,结果表明汉沽断裂是一近东西向大断裂,在1 km深度以上反映不明显,2~3 km深度反映最清楚,向下切割深度可达4 km以深;在研究区中部汉沽断裂被北东向的F1断裂错断成东西两段,西段相对南移而东段相对北移.研究区深部高阻异常与区域地温场高值区具有很好的对应关系,宁河凸起地热资源富集最好的区域是地温场高值区,即深部高阻异常区,据此圈定了研究区3~5 km深度地热资源远景区.

关键词: 大地电磁测深, 宁河凸起, 三维反演, 地热

Abstract:

The investigation of deep geothermal resources in Binhai New Area is a special evaluation issued by Tianjin Bureau of land and resources and housing managemen to Tianjin Geothermal Exploration and Development-Designing Institute in 2016,the main purpose is to find out the 4000 m of the Binhai New Area of geothermal resources occurrence conditions of shallow geothermal reservoir, the Binhai New Area of deep geothermal resources exploration and development before the key scenic area. The Ninghe uplift is a weak area of deep geothermal resources exploration in Tianjin Binhai New Area. As the key area of this work, a large number of magnetotelluric sounding points have been arranged. In this paper,132 magnetotelluric sounding points on the Ninghe uplift are systematically analyzed and processed, and the shallow three-dimensional conductive structure model of the Ninghe uplift 5 km is obtained. G-B decomposition results show that the Ninghe uplift, East and west sides of the main structural trend is different, Ninghe uplift west main structural trend from north to East, Ninghe raised the west boundary of North East to the Cangdong fault; on the eastern side of the Hangu fault, influence by ew. The one-dimensional Bostick inversion results can be seen that the structural difference to Ninghe uplift; 2D inversion results can show Hangu fracture morphology; 3D inversion results obtained three-dimensional conductive structure model of Ninghe uplift. Three dimensional electrical structure model shows that the geological structure of Ninghe uplift is complex, there are both East-West difference and North-South difference. Combined with the regional gravity and magnetic data analysis, the results show that the Hangu fault is a major fault in the Near East, above the depth of 1 km is not obvious, the depth of 2~3 km reflected most clearly, cutting down the depth of up to 4 km in depth; in the middle of the researcharea by F1 Hangu fault fault North East to break up into two things, the western part of the relative South and East relatively northward. The study area of deep high resistivity anomalies and regional geothermal field in the high value area has good correlation, enrichment of geothermal resources in Ninghe uplift is the best area of geothermal field high value areas, namely the deep high resistivity anomaly zone, the delineation of the study area 3~5 km deep geothermal resources prospecting area.

Key words: magnetotelluric sounding, Ninghe uplift, 3D inversion, geothermal

中图分类号: