O.A. Shnip, A.D. Dzyublo
 
Structural features of oilfields in the Mekong Basin basement
(shelf of Southern Vietnam)
DOI 10.31087/0016-7894-2019-2-93-100

Structural features of some oil fields in the basement of the Mekong Basin, to begin with the largest White Tiger field, are in the fact that oil-water contact is not penetrated there. At the same time, the basement granitoids are strongly affected by hydrothermal processes. This caused dissolution of some rock-forming minerals, primarily feldspar, and formation of secondary minerals: zeolite (mainly laumontite and leonhardite), micaceous, argillaceous, chlorite, etc. minerals, which account for about 12 % (maximum up to 50 %) of the volume of basement rocks. Volume of hydrothermal solutions involved in these processes makes many tens of cubic kilometres. Contour waterflooding is used in the White Tiger field. Comparison of the compositions of water injected and produced allowed concluding that there are formation water at the depth of the accumulation; as a result, the oil-water contact was penetrated.

 

Key words: White Tiger oilfield; basement; hydrothermal minerals; formation water; contour waterflooding; oil-water contact.

For citation: Shnip O.A., Dzyublo A.D. Structural features of oilfields in the Mekong Basin basement (shelf of Southern Vietnam). Geologiya nefti i gaza = Oil and gas geology. 2019;(2):93–100. DOI: 10.31087/0016-7894-2019-2-93-100.

References

1.  Areshev E.G., Dong T.L., Shan N.T., Shnip O.A. Reservoirs in fractured basement on the continental shelf of southern Vietnam. Journal of Petroleum Geology. 1992;15(4):451–464.

2.  Dmitrievskii A.N., Kireev F.A., Bochko R.A., Fedorova T.A. Influence of hydrothermal activity on oil and gas reservoirs formation in basement rocks. Izv. AN SSSR. Ser. Geol. 1992;(5):119–128.

3.  Areshev E.G., Gavrilov V.P., Dong Ch.L. et al. Geology and oil-and-gas-bearing capacity of Sunda shelf sub structure. Moscow: Neft' i gaz; 1997. 288 p.

4.  Koshlyak V.A. Granitoid oil and gas reservoirs. Ufa: Tau, 2002. 256 p.

5.  Pospelov V.V. Crystalline basement: geological and geophysical methods for studies of reservoir quality and oil and gas occurrence. Moscow-Izhevsk: Institut komp'yuternykh issledovanii; NITs “Regulyarnaya i khaoticheskaya dinamika”; 2005. 260 p.

6.  Gavrilov V.P., Gulev G.L., Kireev F.A. et al. Granitoid reservoirs and hydrocarbon potential of southern Vietnamese shelf. Moscow: Nedra, 2010. 294 p.

7.  Shnip O.A., Pospelov V.V. Vremya obrazovaniya porod fundamenta shel'fa Yuzhnogo V'etnama. Izv. vuzov. Geologiya i razvedka. 1996;(5).

8.  Bogoyavlenskiy V.I., Dzyublo A.D., Ivanov A.N., et al. Oil and gas potential of the crystalline basement of the Vietnam shelf: White Tiger and Dragon. Geologiya nefti i gaza = Oil and gas geology. 2016;(5):102–116.

9.  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;(2).

10.  Shnip O.A, Dzyublo A.D. Tseolity v granitoidnykh kollektorakh (na primere fundamenta Mekongskoi vpadiny). Tr. RGUNiG imeni I.M. Gubkina. 2011;265(4):97–101.

O.A. Shnip

Gubkin Russian State University of Oil and Gas (National Research University), Moscow, Russia;

zubkovmyu@mail.ru

A.D. Dzyublo

Gubkin Russian State University of Oil and Gas (National Research University), Moscow, Russia;

zubkovmyu@mail.ru