Abstract
Recent survey results indicate the presence of Tertiary sedimentary basins with hydrocarbon potential in the boundaries of Vietnam continental shelf. These basins were perhaps formed in the Early Oligocene on the Mesozoic basement of continental crust and were filled with mainly deltaic clastic sediments. From very early Miocene these basins have linked together and became wider. Sediments of marine and prograding delta facies accumulated and widespreaded on the whole continental shelf. At the Middle Miocene to present-day the opening of the Bien Dong Sea (Vietnam East Sea), the regional tectonic subsidence and the eustatic fluctuation had created sedimentary formations of open and deep marine facies with turbidite shale, platform carbonate including reef build-up. Andesite and basalt extrusion occurred in form of dykes resulting from tectonic inversions in Late Oligocene, in the beginning of Middle Miocene, particularly in Late Miocene-Pliocene. These Tertiary sedimentary basins are expected to have hydrocarbon potential and need to be investigated and explorated adequately. The main risk is the drilling technology, the exploitation in the deep sea and high investment cost.
Highlights
Boundary of Vietnam continental shelf exist the Tertiary sediment basins in which the oil and gas potential proved through exploration and production results
The survey results in margins of Vietnam continental shelf indicated, from geologic structure point of view, they are suture zone to deep sea area of Phu Khanh, Nam Con Son basins and develop the Tu Chinh-Vung May basin group
These basins were formed in the Late Eocene-Early Oligocene on the Mesozoic basement of continental crust and were filled with mainly clastic lacustrine, deltaic intermix with coastal sediments
Summary
Boundary of Vietnam continental shelf exist the Tertiary sediment basins in which the oil and gas potential proved through exploration and production results. The open sea and deep water regions of Vietnam continental shelf include areas of Bien Dong sea surrounding basins such as PhuKhanh basin, Eastern shelf of Nam Con Son basin, and Tu Chinh-Vung May basin group (figure 01). These basins been generated and developed in structural geology region complicatetly, the vestiges of micro Mezozoic Indosinia plate which partly oceanismed during Bien Dong Sea widespreaded, happened mostly in Oligocene. The convolution history of these basins include three main stages (fig 02, 03) [2]: Indian
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