Geologiya Nefti i Gaza
Print ISSN 0016-7894
Online ISSN 2587-8263
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A.V. Gvozdeva, E.A. Taratyn
Geological and geophysical substantiation of clay cap prediction in the Sukhodudinsky Formation (Tanamo-Malokhetsky mega-swell, Yenisei-Khatanga petroleum region)
DOI 10.31087/0016‑7894‑2018‑5‑37‑49
Alternati on of reservoir rocks and impermeable beds in the section, along with the other factors, is a necessary condition for formation of hydrocarbon accumulations. The problem of prospecting for hydrocarbons within the Tanamo‑Malokhetsky swell out of the zone of clinoforms development, is associated with the lack of regional impermeable beds in the Sukhodudinsky section. Because of this, investigations of caprocks is of current importance in the territory. The paper discusses geological and geophysical substantiation of impermeable beds prediction in the section. Object of our research is Lower Cretaceous Sukhodudinsky formations identified within the Malokhetsky‑Upper‑Sukhodudinsky reservoir. In the territory of the Tanamo‑Malokhetsky mega‑swell, the formation is represented by alternation of sandy‑siltstone‑clay rocks. Irregularity of impermeable beds is typical for the reservoir. Presence of hydrocarbon accumulati ons is governed by zonal and mainly local occurrence of clay seals. Well log suite from 32 wells was used as the actual data. According to well tops, the Sukhodudinsky Fm (K1sd) occurs in the depth interval from 400 to 2750 m, which corresponds to the stages of early and meso‑catagenesis. Lithological breakdown of the section is carried out. Potenti al impermeable beds are identi fi ed in the secti on. Caliper logging data were used to identi fy a swelling clay in the promising traps of the Sukhodudinsky formati on. Vugs of larger depth are a sign of higher swelling clay. It is shown that quality of potenti al seal depends not only on its thickness, but also on the total content of a swelling clay. Threshold values of a seal thickness and a swelling clay content are obtained for water‑saturated secti ons, and also for the sections that can be gas‑saturated or water‑saturated, and only gas‑saturated. It is found that position of the potential impermeable bed in the section is defined by the subsea depth of top and bottom of the Sukhodudinsky Fm. This provision allows predicting the areal distribution of seals.
Key words: Yenisei-Khatanga petroleum region; Tanamo-Malokhetsky mega-swell; Sukhodudinsky formati on; catagenesis; impermeable bed; swelling clay; seal; well logging.
For citation: Gvozdeva A.V., Taratyn E.A. Geological and geophysical substantiation of clay cap prediction in the Sukhodudinsky Fm (Tanamo‑Malokhetsky mega‑swell, Yenisei‑Khatanga petroleum region). Geologiya nefti i gaza. 2018;(5):37–49. DOI: 10.31087/0016‑7894‑2018‑5‑37‑49.
Литература
1. Afanasenkov A.P., Surova N.D., Levchuk L.V., Kiselev A.A., Kopilevich E.A. Capacitive characteristics of reservoirs of Jurassic – Сretaceous deposits of the gidan and western part of the Yenisei-Khatanga oil and gas bearing areas. Geologiya nefti i gaza. 2017;(4):45–54.
2. Glagolev P.L., Mazanov V.F., Mikhailova M.P. Geology and petroleum potential of the Yenisei-Khatanga Depression. Moscow: Izdatelstvo IGiRGI; 1994. 117 p.
3. Golovin S.V. Сlassification of mesozoic oil-gas complexes of the Yenisei-Khatanga trough. Neftegazovaya geologiya. Teoriya I praktika = Petroleum Geology — Theoretical and Applied Studies. 2009;4(1):1–21.
4. Osipov V.I., Sokolov V.I., Eremeev V.V. Argillaceous caprocks of oil and gas fields. Moscow: Nauka; 2001. 238 p.
5. Khanin A.A. Oil and gas reservoir rocks and their studies. Moscow: Nedra; 1969. 368 p.
6. Klubova T.T., Korolev Yu.M., Roznikova A.P. et al. Pore space and organic matter of reservoirs and seals. Moscow: Nauka; 1986. 95 p.
7. Semenov E.O., Semenova O.G. Studies of argillaceous rocks lithology. Building UGS in water-bearing beds: new method of sealing capacity assessment. Nauka i tekhnika v gazovoi promyshlennosti. 2004;(3–4):17–20.
8. Gorodnov V.D. Physical and chemical methods of drilling problems prevention. Moscow: Nedra; 1984. 229 p.
9. Vendel'shtein B.Yu. Studies of oil and gas well columns using self-potential logging. Moscow: Nedra; 1966. 206 p.
10. Gabrielyants G.A., Dikenshtein G.X., Razmyshlyaev A.A., Lodzhevskaya M.I. Major patterns of hydrocarbon accumulations distribution in USSR and abroad. Moscow: Izdatelstvo VIEMS; 1989. 44 p.
A.V. Gvozdeva
FGBU «All‑Russian Research Geological Oil Institute», Moscow, Russia;
E.A. Taratyn
FGBU «All‑Russian Research Geological Oil Institute», Moscow, Russia;