Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (2): 507-516.doi: 10.13278/j.cnki.jjuese.20170252

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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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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

CLC Number: 

  • P631.1
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