The pdf file of this paper is in Russian.
The geodynamic arrangement in the South China Sea situated in the junction zone of Eurasian, Pacific and Indo-Australian tectonic plates was analyzed on the basis of seismologic and gravimetric data. The detailed structural model of crystalline basement based on 2D-3D seismic data and drilling results has been built for Vietsovpetro block 09–1, which includes White Tiger, Dragon and South-East Dragon fields. For the first time the catagenesis scheme of sedimentary bottom has been created. With the help of this scheme authors has determined that the most of the sedimentary rocks in the lower part of the Cuu Long Basin under the South China Sea were situated in meso- and apocatagenesis zones. This allowed to state the general presence of deep sedimentary rocks that have depleted their oil generation potential but still were able to generate catagenetic gas. Moreover the rocks above the deep-lying gas generating sediments were considered to continue liquid hydrocarbon generating. The main regularities of large hydrocarbon deposits formation in deep crystalline basement on southern Vietnam shelf revealed as a result of complex analysis of geological, geophysical and geochemical data. The formation is connected to fractured zones in crystalline basement, significant difference in the depth and catagenesis level of lower part of the Cenozoic oil-source rocks and anomalously high reservoir pressure. According to the sediment structure and catagenesis analysis of White Tiger and Dragon fields the existence of direct contacts between crystalline basement reservoirs and oil-source rocks in Cuu Long Basin causing the real time resource replenishment proved to be the main search criteria.