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 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.
References
1. Areshev E.G., Neftegazonosnost' okrainnykh morey Dal'nego Vostoka i
Yugo-Vostochnoy Azii (Oil and gas bearing of the Far East and South-East
Asia marginal seas), Moscow: Avanti Publ., 2003, 288 р.
2. Maslov V.V., Paleotectonic grounds for oil and gas potential prospects of
Cenozoic sedimentary cover of South Konshon depression (Vietnam’s
shelf) (In Russ.), Geologiya nefti i gaza = The journal Oil and Gas Geology,
2005, no. 4, pp. 42–47.
3. Areshev E.G., Gavrilov V.P., Pospelov V.V. et al., The nature of voidness
and composition of the rocks of oil containing foundation of South Vietnam
shelf (In. Russ.), Neftyanoe khozyaystvo = Oil Industry, 1996, no. 8, pp.
27–29.
4. Gavrilov V.P., Gulev V.L., Kireev F.A. et al., Granitoidnye kollektory i
neftegazonosnost' yuzhnogo shel'fa V'etnama (Granitoid collectors and
oil and gas bearing of Vietnam southern offshore), Moscow: Nedra Publ.,
2010, 294 p.
5. Areshev E.G., Gavrilov V.P., Dong Ch.L. et al., Model of geodynamic evolution
of the continental shelf south of Vietnam (In Russ.), Geologiya i geologorazvedochnye
raboty, 1996, no. 8, pp. 30–34.
6. Lyong T.V., Nyan N.Kh., Features of distribution and change of reservoir
pressure in granitoid collectors of White Tiger field (In Russ.), Neftegazovoe
delo, 2009, URL:
www.ogbus.ru
7. Bogoyavlenskiy V.I., The oil and gas industry in the Pacific region: condition,
problems and development prospects (In Russ.), Nauchnye trudy
Vol'nogo ekonomicheskogo obshchestva Rossii i Mezhdunarodnogo
soyuza ekonomistov, 2015, V. 40, pp. 214–238.
8. Tuan L.M., Zhabin A.N., Makarov N.A., Kuz'menko V.P., Economic efficiency
of Vietsovpetro production activities (In Russ.), Neftyanoe
khozyaystvo = Oil Industry, 1996, no. 8, pp. 88–89.
9. Areshev E.G., Dong T.L., San N.T., Shnip O.A., Reservoirs in fractured basement
on the continental shelf of Southern Vietnam, J. of Petroleum Geology,
1992, no. 15 (4), pp. 451–464.
10. Dmitrievskiy A.N., Kireev F.A., Bochko R.A., Fedorova T.A., Effect of hydrothermal
activity on the formation of oil and gas reservoirs in the basement
rocks (In Russ.), Izvestiya AN SSSR. Seriya Geologicheskaya, 1992,
no. 5, pp. 119-128.
11. Tien Kh.D., Usloviya neftegazoobrazovaniya i formirovaniya uglevodorodnykh
skopleniy v kaynozoyskikh osadochnykh basseynakh kontinental'nogo
shel'fa SRV (Environment of oil and gas generation and the formation
of hydrocarbon accumulations in the Cenozoic sedimentary
basins of the continental shelf of Vietnam): thesis of doctor of geological
and mineralogical science, 1999.
12. Khay V.V., Serebrennikova O.V., Savinykh Yu.V., Somposition and sources
of oils in the terrigenous and volcanogenic reservoirs from White Tiger deposit
(Vietnam) (In Russ.), Vestnik Tomskogo gosudarstvennogo universiteta,
2012, V. 361, pp. 165–170.
13. Areshev E.G., Gavrilov V.P., Dontsov V.V., Alternative model of oil pool
forming in the basement of White Tiger field (In Russ.), Neftyanoe
khozyaystvo = Oil Industry, 2004, no. 9, pp. 44–47.
14. Gavrilov V.P., Dzyublo A.D., Pospelov V.V., Shnip O.A., Geology and oil
content of the foundation of South Vietnam shelf (In Russ.), Geologiya nefti
i gaza = The journal Oil and Gas Geology, 1995, no. 4, pp. 25–29.
15. Shnip O.A., Dzyublo A.D., Zeolites in oil-bearing rocks offshore South
Vietnam and their influence on the properties of reservoirs, Oil of Vietnam,
1994, no. 2, pp. 2–11.
16. Gavrilov V.P., Non-traditional model of granites formation and their oil
and gas potential (with reference to southern shelf of Vietnam) (In Russ.),
Geologiya nefti i gaza = The journal Oil and Gas Geology, 2010, no. 1,
pp. 51–58.
17. Kiryukhin A.V., Kireeva T.A., Oil reservoir formation with steam condensate
hydrothermal system conditions according to the results of numerical
modeling (at the example of the White Tiger deposit, Vietnam) (In Russ.),
Geologiya nefti gaza = The journal Oil and Gas Geology, 2015, no. 1,
pp. 78–86.
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