Forecasting zonation of oil-gas prospects in the sedimentary basins of the Northeast Vietnam continental shelf based on gravity and borhole data

Tuan Duong Tran; Tuan Dung Tran; Trong Lap Tran; Hoang Tam Tran; Hoang Linh Pham Le; Van Thanh Nguyen

doi:10.15625/1859-3097/17234

Authors

Tran Tuan Duong Institute of Marine Geology and Geophysics, VAST, Vietnam; Graduate University of Science
Tran Tuan Dung Institute of Marine Geology and Geophysics, VAST, Vietnam; Graduate University of Science
Tran Trong Lap Institute of Marine Geology and Geophysics, VAST, Vietnam
Tran Hoang Tam Thai Nguyen University of Science, Thai Nguyen, Vietnam
Pham Le Hoang Linh Institute of Ecology and Works Protection, Hanoi, Vietnam
Nguyen Van Thanh Petroleum Archives Center, Vietnam Petroleum Institute, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/17234

Keywords:

Normalized total gradient, oil/gas prospect, Fourier developed coefficient.

Abstract

In this paper, the method of 2D and 3D normalized total gradient (NTG) of gravity anomalies can be applied to detect the gravity anomalies caused by oil-gas reservoirs. The NTG of gravity anomalies can be associated to known oil-gas reservoirs, and most of them seem to be good coincidence with the reservoirs. The closed minima of the NTG of gravity anomalies indicating the existence as well as locations of the density deficient anomalies that closely related to the possible oil-gas reservoirs. The reliability of the NTG method depends mainly on the Fourier developed coefficient N. Here, N is optimally selected by the borehole data. The 2D, 3D normalized total gradient method is applied in the sedimentary basins of the Northeast Vietnam continental shelf. The results of the method are confirmed by borehole data.