吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (2): 507-516.doi: 10.13278/j.cnki.jjuese.20170252

• 深部地质地球物理 • 上一篇    下一篇

基于重力异常的松辽盆地构造特征识别

马国庆, 孟庆发, 黄大年   

  1. 吉林大学地球探测科学与技术学院, 长春 130026
  • 收稿日期:2017-11-21 出版日期:2018-03-26 发布日期:2018-03-26
  • 作者简介:马国庆(1984-),男,副教授,博士,主要从事重磁数据采集、校正与解释技术方面的研究,E-mail:maguoqing@jlu.edu.cn
  • 基金资助:
    国家重点研发计划项目（2017YFC0602203，2017YFC0601606）；国家油气重大专项（2016ZX05027-002-003）；国家自然科学基金项目（41604098，41404089，41430322）

Structure Identification by Gravity Anomaly in Songliao Basin

Ma Guoqing, Meng Qingfa, Huang Danian   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2017-11-21 Online:2018-03-26 Published:2018-03-26
  • Supported by:
    Supported by National Key Research and Development Program of China(2017YFC0602203,2017YFC0601606),National Oil and Gas Major Sub Project(2016ZX05027-002-003)and National Natural Science Fundation of China(41604098,41404089,41430322)

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摘要： 为了解决构造识别中多个断层不能同时识别倾向的问题，提出了利用断裂构造重力异常水平导数的分布特征实现的倾向成像技术，即断裂水平导数变化率较小的一侧指示断裂的倾向；由此可直接标识出断裂的特征，避免了以往该类方法复杂的运算。将这种技术应用到松辽盆地的实测重力异常的处理中，获得了松辽盆地的构造特征。松辽盆地东西两侧具有明显的重力异常差异，但已有的电法、地震资料难以揭示这种差异的原因。笔者以地震数据为约束，利用重力数据进行松辽盆地地层界面的反演，获得了莫霍面及以下的界面特征；认为松辽盆地重力异常差异的原因是松辽盆地莫霍面下方10 km存在一个界面，且由于太平洋板块的俯冲造成该界面在松辽盆地发生了较大的起伏，从而呈现异常的变化。

关键词: 重力异常, 松辽盆地, 断裂, 界面

Abstract: The authors deduced that the distribution of the horizontal derivative of the gravity anomaly of the fault structure can realize the recognition of the fault tendency, which indicates the tendency of the fracture on the side of the small change rate of the fracture horizontal derivative, so it can directly identify the fracture characteristics and avoid the complicated operation of the previous methods. The technique is applied to the treatment of gravity anomaly in Songliao basin, and the tectonic characteristics of Songliao basin are obtained. There are obvious differences of gravity anomaly between the east and the west of Songliao basin, and the reasons of the difference are difficult to be revealed by electric method and seismic data. The boundary inversion of Songliao basin is conducted by gravity data, and the interface features of Moho surface and below are obtained by using seismic data. It is proved that the difference of gravity anomalies in Songliao basin is caused by the boundary of 10km under Moho in Songliao basin, and the great fluctuation occurs in Songliao basin due to the subduction of the Pacific plate.

Key words: gravity anomaly, Songliao basin, fault, boundary

中图分类号: 

  • P631.1
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