Gravity Anomalies and Depths of Sedimentary of Mekong Delta Area, South of Vietnam

Abstract:

The Mekong Delta is the region in the south of Vietnam with the total area of about 40.000 km² and almost of this area is covered by water. Gravity measurement of this area was performed by Cuu Long Petroleum Agency (Vietnam) in 1980’s and the Bouguer anomaly map of this area at the scale of 1/500.000 was established.

We used the Bouguer anomaly map to study the geological structure of this area. This paper is divided into two parts. Firstly, we split the Mekong Delta area into two basins (CanTho–DongThap and TraCu basins) and two swells (Saigon and SocTrang swells) and delineated their boundaries by using the characteristics of Bouguer anomalies. Secondly, we used the second polynomial formula to separate the Bouger anomaly map into the regional and residual gravity anomaly maps. With this residual anomaly map, the 3D basemenf of Cenozoic–Mesozoic sediments of this area was computed by using the Parker-Oldenburg method.