基于位场分离和向下延拓的多界面反演研究及应用

全文: PDF (0 KB) HTML ( KB) 输出: BibTeX | EndNote (RIS) 背景资料

摘要为实现复杂模型的多密度界面的反演，本文在前人反演方法的基础上，提出了一种基于位场分离和向下延拓的多界面反演方法。首先设计了多界面复杂反演模型，认为各地层分界面起伏是引起布格重力异常的主要原因，并将地层顶界面平均深度处设置为底界面的基准面，然后应用布格重力异常数据，通过切割法分离出各密度界面在地面引起的重力异常，为提高Parker-Oldenburg反演方法的收敛性，利用位场大深度向下延拓方法将异常延拓至基准面。最后应用Parker-Oldenburg反演方法实现各界面的精确反演。通过模型实验，证实反演方法可行。借助天津市团泊-大寺地区已有断裂体系、钻孔及收集的物性资料，应用该方法有效实现了布格重力异常的位场分离、向下延拓及各界面的反演。应用具有纵向高分辨率的地震、MT资料制作的虚拟钻孔及已有钻孔资料，对反演界面进行精度评价，证实反演结果可信、反演方法可靠。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章

关键词：位场分离切割法位场大深度向下延拓方法 Parker-Oldenburg反演方法团泊-大寺虚拟钻孔

Abstract： In order to realize the inversion of multi-density interface in complex model, a multi-interface inversion method based on potential field separation and downward continuation was proposed on the basis of previous inversion methods. Firstly, a multi-interface complex inversion model was designed. It was considered that Bouguer gravity anomaly was mainly generated by the undulations of every density interfaces, and the average depth of the top interface of the density layer was set as the datum plane of its bottom interface. Then, the gravity anomaly generated by each density layer on the ground was separated from the Bouguer gravity anomaly using the cutting method. In order to improve the convergence of Parker-Oldenburg inversion method, the method for downward continuation of potential fields with a larger continuation depth was used to extend the anomaly to the datum plane. Finally, Parker-Oldenburg inversion method was used to realize accurate inversion of each interface. The inversion method was proved to be feasible using a model experiment. Through the application of this method in Tuanbo-Dasi area, Tianjin, the potential field separation of Bouguer gravity anomaly, the downward continuation of the separated anomaly and the inversion of each interface were effectively realized with the help of the existing fracture system, drilling holes and the collected physical property data in the area. Virtual boreholes were made using seismic and MT results with high resolution in vertical detection in order to make up for the shortage and uneven distribution of boreholes, and in addition to the existing borehole data, the accuracy of the inversion interface depth was evaluated, which proved that the inversion result and the inversion method were reliable.

Key words： Separation of potential field the cutting method Large depth downward continuation method of potential fields Parker-Oldenburg inversion method Tuanbo-Dasi area virtual boreholes

收稿日期: 2018-08-16; 出版日期: 2020-04-03

基金资助:

本研究由天津华北地质勘查局科研项目（HK2018-B4-4）和天津市国土资源和房屋管理局科研项目联合资助。

通讯作者: 郑国磊（E-mail：zhengguolei@126. com） E-mail: zhengguolei@126.com

作者简介: 郑国磊，高级工程师。主要从事重力反演研究、数值信号处理及三维可视化建模工作。Email: zhengguolei@126.com.

引用本文:

. 基于位场分离和向下延拓的多界面反演研究及应用[J]. 应用地球物理, 2018, 15(3-4（2）): 668-681.

. Research and application of multi-interface inversion based on potential field separation and downward continuation[J]. APPLIED GEOPHYSICS, 2018, 15(3-4（2）): 668-681.