吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (4): 1221-1230.doi: 10.13278/j.cnki.jjuese.20170171

• 地球探测与信息技术 • 上一篇    下一篇

天津市重力数据反演解释

郑国磊1, 徐新学1, 李世斌1, 袁航1, 马为1, 叶青2   

  1. 1. 天津市地球物理勘探中心, 天津 300170;
    2. 中国地震台网中心, 北京 100045
  • 收稿日期:2017-11-21 出版日期:2018-07-26 发布日期:2018-07-26
  • 通讯作者: 徐新学(1970-),男,教授级高级工程师,工程硕士,主要从事地球物理方法的应用及研究工作,E-mail:xuxinxue@126.com E-mail:xuxinxue@126.com
  • 作者简介:郑国磊(1983-),男,工程师,硕士,主要从事重力勘探研究、软件编写及三维可视化建模工作,E-mail:zhengguolei@126.com
  • 基金资助:
    中国地质调查局、天津市国土资源和房屋管理局合作项目（1212011220232）

Inversion of Gravity Data in Tianjin

Zheng Guolei1, Xu Xinxue1, Li Shibin1, Yuan Hang1, Ma Wei1, Ye Qing2   

  1. 1. Tianjin Geophysical Exploration Center, Tianjin 300170, China;
    2. China Earthquake Networks Center, Beijing 100045, China
  • Received:2017-11-21 Online:2018-07-26 Published:2018-07-26
  • Supported by:
    Supported by Cooperation Project Between China Geological Survey and Tianjin Municipal Bureau of Land Resources and Housing Administration(1212011220232)

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摘要： 重力数据反演是获取地下地质信息的有效手段。本文通过对天津市全区密度和电性参数的统计分析，了解天津市地层的物性分布规律。在对研究区布格重力异常数据采用归一化总水平导数垂向导数（NVDR-THDR）技术处理的基础上，对断裂构造进行了识别，对构造单元进行了划分。然后结合研究区地质资料，应用Geosoft软件中的密度界面反演模块对各构造单元内的密度界面起伏进行反演。并以GOCAD软件为平台，构建了天津市三维可视化地质模型，借助大地电磁（MT）测深点虚拟钻孔，实现了对主要地质界面和构造的标定。最后利用布格重力异常数据拟合同位置地质剖面，验证了模型的可靠性。应用上述反演成果，结合区内地质认识，推断宝坻断裂（F1）、蓟运河断裂（F2）、F3、杨柳青断裂（F4）、F7在中生代后活动性较强，沧东断裂（F6）和天津断裂（F30）在古近纪后活动性较强。

关键词: 重力反演, 归一化总水平导数垂向导数, 断裂识别, 虚拟钻孔, GOCAD三维可视化建模, 天津

Abstract: Gravity inversion is one of the most important techniques by which underground geological information is obtained. With density and electrical parameters statistical result in Tianjin, distributional characteristics of physical property of strata are studied in this paper. Using the technique of normalized vertical derivative of the total horizontal derivative of the bouguer gravity anomaly in Tianjin, this paper infers the faults structure and divides into tectonic units in Tianjin. Then the author carried out the inversion of density interfaces inside every tectonic unit in combination with geological information by the density interface inversion module in Geosoft software, and constructed 3-D visual geological models with the inversion results based on the software of GOCAD. In addition, calibrating of the main geological interface and structure was realized by means of virtual drill which is made by depth-apparent resistivity calculated by MT profiles. And the model reliability was verified by the geological profile fitted by Burguer gravity anomaly in the same position. By using the inversion results and previous geological understanding in this area, we inferred Baodi fault、Jiyunhe fault、F3 fault、Yangliuqing fault and F7 fault have strong activity after the Mesozoic era, and so are Cangdong fault and Tianjin fault after Paleogene.

Key words: gravity inversion, NVDR-THDR, fault identification, virtual drill, 3-Dimensional visualization modeling based on GOCAD, Tianjin

中图分类号: 

  • P631.1
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