| 天津市重力数据反演解释 |
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| 引用本文： | 郑国磊,徐新学,李世斌,袁航,马为,叶青.天津市重力数据反演解释[J].吉林大学学报(地球科学版),2018,48(4):1221-1230. |
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| 作者姓名： | 郑国磊 徐新学 李世斌 袁航 马为 叶青 |
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| 作者单位： | 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 |
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| 基金项目： | 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） |
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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。
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| 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 |
| 收稿时间： | 2017-11-21 |
Inversion of Gravity Data in Tianjin |
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| Zheng Guolei,Xu Xinxue,Li Shibin,Yuan Hang,Ma Wei,Ye Qing.Inversion of Gravity Data in Tianjin[J].Journal of Jilin Unviersity:Earth Science Edition,2018,48(4):1221-1230. |
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| Authors: | Zheng Guolei Xu Xinxue Li Shibin Yuan Hang Ma Wei Ye Qing |
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| Institution: | 1. Tianjin Geophysical Exploration Center, Tianjin 300170, China;2. China Earthquake Networks Center, Beijing 100045, China |
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| 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. |
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| Keywords: | gravity inversion NVDR-THDR fault identification virtual drill 3-Dimensional visualization modeling based on GOCAD Tianjin |
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