Bulletin of the Geological Society of Malaysia, Volume 37, July 1995, pp. 1 – 11
Vietnam Petroleum Institute (VPI), Yen Hoa – Tu Liem – Hanoi
Abstract: The Nam Con Son Basin is situated within 6°6‘-9°45‘N and 106°0‘-109°30‘E. Its southern and southeastern boundaries are in the Vietnamese waters which border the neighbouring countries, and its eastern, northern and western boundaries are on the Vietnamese continental shelf. The exploration history of the Nam Con Son Basin can be divided into four periods: the Pre 1975 period, the 1976-1980 period, the 1981-1989 period, and the 1990-present period.
The heterogeneous basement of quartz diorite, granodiorite and Mesozoic metamorphic rocks is unconformably covered by Paleocene-Quaternary sediments composed of the Cau, Dua, Thong-Mang Cau, Nam Con Son and Bien Dong Formations.
All the geological formations in the Nam Con Son Basin can be divided into two complexes of major structural elements, the basement composed of Pre-Cenozoic strata and the cover composed of Cenozoic sediments.
The Nam Con Son Basin can be divided into the following tectonic zones, namely, the Western Differentiated Zone, the Northern Differentiated Zone and the Dua-Close-to-Natuna Zone.
Good source rock sequences are developed in Oligocene lacustrine claystones and in Miocene fine grained clastics. Paleogene reservoir rocks include Oligocene clastics and Lower Miocene reservoir rocks. There are Oligocene and Miocene cap rocks. Potential for both structural and stratigraphical traps are considered to exist in the Nam Con Son Basin.