Modeling of petroleum generation in Phu Khanh Basin by Sigma-2D software
Abstract
The Phu Khanh Basin is a narrow, elongated basin extending from 11.5 to 14°N off the coast of central Vietnam. It is bounded to the west by the narrow Da Nang shelf and separated from the Quang Ngai Graben to the North by the Da Nang shear zone, and from the Cuu Long Basin to the South by the Tuy Hoa shear zone.
The purpose of this paper is to understand, by 2D modeling, the generation, migration and accumulation histories for oil and gas from source rocks in the Phu Khanh Basin. Several regional sections covering shallow to deep-water areas were modeled by SIGMA-2D software. In the sedimentary basin, Oligocene lacustrine source rock has generated oil since the Middle Miocene time and is in gas window in almost the entire area of the basin, with the main part in the deep water area at the present time. The Lower Miocene fluvio-deltaic source rock has generated oil since the Late Miocene time and is in gas window in the central part of the basin at the present time.
Oil and gas generated both in the Oligocene and Lower Miocene source rocks in deep water areas migrated along a regional carrier system in Lower Miocene (both sandstone and porous carbonate) after vertical migration of the Oligocene oil and gas by cap rock leakage and through faults. The oil and gas accumulated in structural highs in both deep water and in shallow water areas. Some were already found as oil seeps from onshore outcrops [1] and were encountered in exploration wells such as 124-CMT-1X.
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