«Proceedings of Gubkin University»

To the problem of replacement of hydrocarbon reserves during development of fields

UDC: 622.276
DOI: 10.33285/2073-9028-2023-3(312)-68-77

Authors:

¹ Oil and Gas Research Institute of the Russian Academy of Sciences, Moscow, Russian Federation

Keywords: impermeable faults, shear stress, decompression zone, hydrodynamic conductivity, productive reservoir, reserve replenishment, activation of faults, oil supply channels

Annotation:

The conditions for the activation of initially impermeable faults with decreased pressure in the reservoirs under development are analyzed. It is established that along a fault line with a displacement, located at a sufficiently large angle to the vertical of the reservoir, with a decrease in reservoir pressure, shear stresses develop in the rock, leading to the destruction of the rigid connection between the sides of the fault, if it existed. In this case, the downward displacement of the formation rock leads to the formation of a deconsolidation zone under the fault line in the formation and the appearance of hydrodynamic conductivity of this fault in a certain section of the formation bottom. It is shown that the penetration of formation fluid even into a small part of the fault line at the bottom of the formation triggers a self-sustaining process of propagation of the hydrodynamic conduction zone along the fault line deep into the rock. The propagation mechanism is due to the unloading of the fault sides from the compressive action of lateral rock pressure, which accompanies the appearance of a high-pressure liquid phase in the fault, which takes on a significant part of the lateral compressive load. The spread of the zone of hydrodynamic conductivity along the fault line leads to the emergence of a hydrodynamic connection between the productive formation with reduced formation pressure and saturated neighboring formations. This causes the replenishment of hydrocarbon reserves in the reservoir being developed, provided that the fault line activated in this way crosses the geological objects containing them.

Bibliography:

1. Gavrilov V.P. Vozmozhnye mekhanizmy estestvennogo vospolneniya zapasov na neftyanyh i gazovyh mestorozhdeniyah // Geologiya nefti i gaza. – 2008. – № 1. – S. 56–64.
2. Bochkarev V.A., Bochkarev A.V. Vospolnyaemye zapasy zalezhej uglevodorodov. – M.: VNIIOENG, 2017. – 276 s.
3. Neftyanye i gazovye mestorozhdeniya – samorazvivayushchiesya i postoyanno vozobnovlyaemye ob’’ekty / R.H. Muslimov, I.F. Glumov, I.N. Plotnikova [i dr.] // Geologiya nefti i gaza. – Specvypusk. – 2004. – S. 43–49.
4. Muslimov R.H., Plotnikova I.N. Vospolnenie neftyanyh zalezhej v svete novoj koncepcii neftegazoobrazovaniya // Georesursy. – 2019. – № 21 (4). – S. 40–48. – DOI: https://doi.org/10.18599/ grs.2019.4.40-48
5. Hydrocarbon production from fractured basement formations / J. Gutmanis, T. Batchelor, L. Cotton, S. Doe // GeoScience Limited. – 2013. – № 11. – 43 p.
6. Islam M.R., Hossain M.E., Islam A.O. Hydrocarbons in Basement Formations // Scrivener Publishing, Willey, 2018. – 642 p.
7. Shilovskij A.P. Vozmozhnost’ ischerpaniya uglevodorodnyh resursov s pozicii fundamental’noj nauki // Geologiya, geofizika i razrabotka neftyanyh i gazovyh mestorozhdenij. – 2022. – № 12 (372). – S. 62–68. – DOI: 10.33285/2413-5011-2022-12(372)-62-68
8. Svalov A.M. Mekhanizm poteri germetichnosti zatrubnogo prostranstva skvazhin pri razrabotke gazovyh mestorozhdenij i ekspluatacii podzemnyh hranilishch gaza // Trudy Rossijskogo gosudarstvennogo universiteta nefti i gaza imeni I.M. Gubkina. – 2023. – № 2 (311). – S. 43–55. – DOI: 10.33285/2073-9028-2023-2(311)-43-55
9. Svalov A.M. Razryvnye narusheniya porody kak koncentratory napryazhenij pri razrabotke mestorozhdenij nefti i gaza // Fiziko-tekhnicheskie problemy razrabotki poleznyh iskopaemyh. – 2022. – № 5. – S. 63–69. – DOI: 10.15372/FTPRPI20220506
10. Muskhelishvili N.I. Nekotorye osnovnye zadachi matematicheskoj teorii uprugosti. – M.: Nauka, 1966. – 708 s.