• Nguyen Kim Dung Institute of Marine Geology and Geophysics, VAST, Vietnam
  • Do Duc Thanh Hanoi University of Science, VNU, Vietnam
  • Hoang Van Vuong Institute of Marine Geology and Geophysics, VAST, Vietnam
  • Duong Thi Hoai Thu Hanoi University of Natural Resources and Environment, Hanoi, Vietnam



Determine, combine, the source boundary, new methods, Pre-Cenozoic basement, density, fault, structural block.


In this paper, we present some new results of the Pre-Cenozoic basement structure on the Southeast continental shelf of Vietnam based on the combination of some modern methods to analyse and interpret gravity data. They are the 3D gravity inversion method, the directional analytic signal derivatives and the curvature gravity gradient tensor. The results obtained include the density distribution, the fault system and the main structural blocks inside of the Pre-Cenozoic basement on Southeast continental shelf of Vietnam. The initial results about density distribution show that it relatively clearly reflects the shape of basins in the area: The contours that have value σ =2.7 g/cm3 and value σ = 2.76 g/cm3 are near the edges of the Cuu Long basin and the Nam Con Son basin, respectively. The density value reaches the maximum at the center of basins. For the Cuu Long basin, the maximum value is σmax= 2.76 g/cm3 and the Nam Con Son has maximum value σmax= 3.0 g/cm3. Many faults that appear in the study area have the existence depth in the wide range from 6 km to 30 km, even above 30 km and the faults that have the existence depth from 8 to 10 km are in the majority. In particular, the boundary of anomalous sources existing in the Pre-Cenozoic basement is shown by the better resolution, at which more edge points are identified than the maximum horizontal gradient amplitude method that is widely used. The results also show that the combination of individual results complements each other and creats the sufficient and clearer picture inside of the Pre-Cenozoic basement.


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Bui Cong Que, Hoang Van Vuong, 1996. The density distribution characteristic of the Pre-Cenozoic basement on the Southeast continental shelf on the basis of the structural modeling of the Earth’s crust. PetroVietnam Journal, 14–22.

Hoang Van Vuong, 1999. Research on structural elements of the Pre-Cenozoic basement on Central continental shelf by gravity data. Researches on Marine Geology and Geophysics, 5, 143–153.

Bott, M. H. P., 1960. The use of rapid digital computing methods for direct gravity interpretation of sedimentary basins. Geophysical Journal International, 3(1), 63–67.

Do Duc Thanh, Nguyen Kim Dung, 2013. Determine density distribution of basement rock by modeling of 3D gravity inversion. Vietnam Journal of Earth Sciences, 35(1), 47–52

Nguyen Kim Dung, Do Duc Thanh, Hoang Van Vuong, 2016. Research on combination methods of modern processing and interpretation to determine Pre-Cenozoic basement structure using gravity data. Journal of Geology, A(361–362), 103–113.

Dung, T. T., Que, B. C., and Phuong, N. H., 2013. Cenozoic basement structure of the South China Sea and adjacent areas by modeling and interpreting gravity data. Russian Journal of Pacific Geology, 7(4), 227–236.

Nguyen Thu Huyen, Trinh Xuan Cuong, et al., 2016. Updating the map of structure of Pre-Cenozoi basement on the basis of interpreting 2D-PVN12 seismic data. PetroVietnam Journal, 11, 16–20.

Bui Cong Que, et al., 2005, Building the map volume on the environmental and natural conditions of the Vietnam sea and adjacent area. Project No. KC-09-02, Marine Research Program, Hanoi.

Hoang Dinh Tien, Hoang Thi Xuan Huong, 2012. Nam Con Son basin from the geodynamic perspective, PetroVietnam Journal, 8, 15–23.

Nguyen The Tiep, 2006. ATLAS for the Natural and Environmental conditions of Vietnam Sea area and adjacent area. Project No. KC.09-24 belonging to the National Marine Research Program 2000–2005.

Nguyen Kim Dung, Do Duc Thanh, 2016. Using the analytic signal method of gravity gradient tensor (GGT) to determine the location and depth of the faults in the Pre-Cenozoic basement rocks of the Red river trough. Vietnam Journal of Earth Sciences, 38(2), 143–152.

Nguyen Kim Dung, 2016. Application of the new method to determine the main structure of the Pre-Cenozoic basement in the Gulf of Tonkin and adjacent area. Journal of Marine Science and Technology, 16(4), 356–363.

Rao, D. B., Prakash, M. J., and Babu, N. R., 1990. 3D and 2½ D modelling of gravity anomalies with variable density contrast 1. Geophysical Prospecting, 38(4), 411–422. doi: 10.1111/j.1365-2478.1990.tb01854.x

Beiki, M., 2010. Analytic signals of gravity gradient tensor and their application to estimate source location. Geophysics, 75(6), I59–I74.

Debeglia, N., and Corpel, J., 1997. Automatic 3-D interpretation of potential field data using analytic signal derivatives. Geophysics, 62(1), 87–96.

Oruç, B., Sertçelik, I., Kafadar, Ö., and Selim, H. H., 2013. Structural interpretation of the Erzurum Basin, eastern Turkey, using curvature gravity gradient tensor and gravity inversion of basement relief. Journal of Applied Geophysics, 88, 105–113.

Sandwell, D. T., Müller, R. D., Smith, W. H., Garcia, E., and Francis, R., 2014. New global marine gravity model from CryoSat-2 and Jason-1 reveals buried tectonic structure. Science, 346(6205), 65–67. doi: 10.1126/science.1258213.

Nguyen Nhu Trung, Nguyen Thi Thu Huong, 2004. Moho structure of the East Sea on 3D direct gravity inversion: Implication for isostatic equilibrium state.

Gómez-Ortiz, D., and Agarwal, B. N., 2005. 3DINVER. M: a MATLAB program to invert the gravity anomaly over a 3D horizontal density interface by Parker-Oldenburg's algorithm. Computers & Geosciences, 31(4), 513–520.

Whittaker, J. M., Goncharov, A., Williams, S. E., Müller, R. D., and Leitchenkov, G., 2013. Global sediment thickness data set updated for the Australian‐Antarctic Southern Ocean. Geochemistry, Geophysics, Geosystems, 14(8), 3297–3305. doi: 10.1002/ggge. 20181.