Pages
Download article

Transformation of deep fluid flow in the process of oil and gas field formation of north Western Siberia

O.Yu. Batalin, N.G. Vafina

Original article

DOI https://doi.org/10.18599/grs.2019.3.25-30

25-30
rus.

open access

Under a Creative Commons license

Since the discovery of giant hydrocarbon fields in the north of Western Siberia, no unified concept regarding the mechanism and stages of their formation has been developed. This paper on the example of the Urengoy field demonstrates that the formation of HC accumulations from Jurassic to Cenomanian is related to hydrocarbon fluids, flowing upwards from the deep depth, and their subsequent transformation. In the sedimentation process, the gases of the secondary kerogen destruction form an upward fluid flow, which dissolves oil components from source rocks and carry them to shallower depths. The formation waters of the north Western Siberia are methane-saturated; so, due to changes in its solubility during the Neogene uplift, methane comes out into a free phase. The calculations were performed on the upward flow phase separation and oil and gas content changes in reservoirs with depth. The addition of 50 mole% of methane released from the water to the Neocomian reservoirs gives a good agreement on the C1-C4 components and the C5+ content in the formation gas. The calculations were based on the proposition that methane captures light fractions from oil rims, thus increasing oil density. At shallow depths, the hydrocarbons are biodegraded, which leads to formation of almost pure methane accumulations in the Cenomanian reservoirs. The main mechanism of the upward flow transformations, controlling the oil and gas accumulation, is phase transitions. The additional factors, like methane dissolution in water and its transition into a free phase, microbial converting of hydrocarbons assure consistency between the calculated formation fluid properties and the actual data in the entire sedimentary section.

 

Deep fluids, phase transitions, condensation mechanism, primary migration, hydrocarbon field formation, methane dissolution, Western Siberia, Urengoy field

 

  • Batalin O.Yu., Vafina N.G. (2008). Kondensatsionnaya model’ obrazovaniya zalezhey nefti i gaza [Condensation model of oil and gas field formation]. Moscow: Nauka, 248 p. (In Russ.)
  • Batalin O., Vafina N. (2017). Condensation Mechanism of Hydrocarbon Field Formation. Scientific Reports, 7: 10253. https://doi.org/10.1038/s41598-017-10585-7
  • Gricenko, A. I., Ostrovskaya, T. D.,Yushkin, V. V. (1983). Uglevodorodnye Kondensaty Mestorozhdeniy Prirodnogo Gaza. [Hydrocarbon Condensates of Natural Gas Fields]. Moscow: Nedra, 263 p. (In Russ.)  
  • Dmitrievskii A.N. (2008). Polygenesis of oil and gas. Doklady Earth Sciences, 419(2), pp. 373-377. https://doi.org/10.1134/S1028334X08030033
  • Dmitrievsky A.N, Valyaev B.M. (2008). Hydrocarbon branch of degassing in studies on the problem of “Degassing the Earth”. Degasaciya Zemli: Geodinamica, Geofluidy, Neft, Gas i ih Paragenesy [Degassing of the Earth: Geodynamics, geofluids, oil, gas and their parageneses], Moscow: GEOS, pp. 3-6 (In Russ.)
  • Fjellanger E., Kontorovich A.E., Barboza S.A. et al. (2010). Charging the giant gas fields of the NW Siberia basin. Petroleum Geology: From Mature Basins to New Frontiers-Proceedings of the 7th Petroleum Geology Conference, London, 7, pp. 659-668. https://doi.org/10.1144/0070659
  • Littke R., Cramer B., Gerling P. et al. (1999). Gas Generation and Accumulation in the West Siberian Basin. AAPG Bulletin, 83, pp. 1642-1665. https://doi.org/10.1306/E4FD4233-1732-11D7-8645000102C1865D
  • Liu Z., Moldowan J.M., Nemchenko-Rovenskaya A., Peters K.E. (2016). Oil families and mixed oil of the North-Central West Siberian basin, Russia. AAPG Bulletin, 100(3), pp. 319-343. https://doi.org/10.1306/12111514199
  • Milkov A.V. (2010). Methanogenic biodegradation of petroleum in the West Siberian Basin (Russia): Significance for formation of giant Cenomanian gas pools. AAPG Bulletin, 94, pp. 1485-1541. https://doi.org/10.1306/01051009122
  • Murris R.J. (2001) Gas generation and accumulation in the West Siberian Basin: Discussion. AAPG Bulletin, 85, pp. 1891-1892. https://doi.org/10.1306/8626D09F-173B-11D7-8645000102C1865D
  • Nemchenko N.N., Rovenskaya A.S., Shoell M. (1999). Origin of natural gases of giant gas pools on the north of West Siberia, Geologiya nefti i gaza = Geology of oil and gas, 1-2, pp. 45-56 (In Russ.)
  • Prasolov E.M. (1990). Izotopnaya geokhimiya i proiskhozhdeniye prirodnykh gazov [Isotope geochemistry and the origin of natural gases]. Leningrad: Nedra, 283 p. (In Russ.)
  • Punanova S.A., Shuster V.L. (2018). A new approach to the prospects of the oil and gas bearing of deep-seated Jurassic deposits  in the Western Siberia. Georesursy = Georesoures, 20(2), pp.67-80. DOI: https://doi.org/10.18599/grs.2018.2.67-80
  • Sirotenko O.I, Titova G.I (2002). A model of migration-accumulation processes in the Bazhenov suite, discovered by the Tyumen superdeep borehole (SG-6). Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdenii = Geology, geophysics and development of oil and gas fields, 2, pp. 23-26 (In Russ.)
  •  

Oleg Yu. Batalin
Oil and Gas Research Institute of the Russian Academy of Sciences
3 Gubkin str., Moscow, 119333, Russian Federation
E-mail: oleg_batalin@mail.ru

Nailya G. Vafina
Oil and Gas Research Institute of the Russian Academy of Sciences
3 Gubkin str., Moscow, 119333, Russian Federation

 

For citation:

Batalin O.Yu., Vafina N.G. (2019). Transformation of deep fluid flow in the process of oil and gas field formation of north Western Siberia. Georesursy = Georesources, 21(3), pp. 25-30. DOI: https://doi.org/10.18599/grs.2019.3.25-30