Regional petroleum geology
Section editor – PhD in geology and mineralogy Makarevich V.N.
| Article # 39_2018 | submitted on 08/31/2018 displayed on website on 10/25/2018 |
| 19 p. | Pogodaev A.V. |
| Influence of abnormally high formation pressure on the Permian sequences preservation conditions of the Khapchagay mega-swell | |
| The main fields of the Lena-Vilyuy Petroleum Province are within Khapchagay district. The massive nature of the Permian gas reservoirs, controlled by Khapchagay elevation used in the first appraisal of potential reserves of the giant trap, was based on the large linear size of the studied structure. The presence of an abnormally high formation pressure indicated the exceptional sealing quality of the Nedzheli Formation seal – like already made prediction. The bedded form of sequences considered for exploration, was actively discussed. It significantly reduced the trap's reserves and contradicts the original chosen "massive" model. Along with the gas flows from Permian section during the well testing, the inflows of formation water was obtained. The analysis of hydrogeological testing performed by the author indicates the presence of a high lateral pressure gradient. Distribution of formation pressure within Khapchagay structure characterized by a range of values comparable with the amplitude of the trap that shows its hydrodynamic openness. The key influence of the dynamics of the upper Permian hydrogeological system on the preservation conditions of gas deposits in Khapchagay district was established. A conceptually new Geological model of the formation of gas reservoirs is proposed. It is concluded that Permian oil and gas system of Khapchagay structure objectively lost prevailed "massive" gas saturation character and position of the boundary "gas-water" in the new conditions is determined not only by the structural factors, but also by the dynamics of the related aquifer system. The probability of reservoirs detection Permian section remains within the flat areas of the southern slope of the structure. Additional migration gas flow towards the southern side is a favorable factor for the formation of new accumulations of hydrocarbons in the surrounding areas. Keywords: Permian sedimentary rocks, abnormal reservoir pressures, hydrogeological system, lateral gradient, gas field, Khapchagay mega-swell, Siberian Platform. |
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| article citation | Pogodaev A.V. Vliyanie rezhima anomal'no vysokogo plastovogo davleniya na usloviya formirovaniya i sokhraneniya zalezhey gaza v verkhnepermskikh otlozheniyakh Khapchagayskogo megavala [Influence of abnormally high formation pressure on the Permian sequences preservation conditions of the Khapchagay mega-swell]. Neftegazovaya Geologiya. Teoriya I Praktika, 2018, vol. 13, no. 4, available at: http://www.ngtp.ru/rub/2018/39_2018.html |
| DOI | https://doi.org/10.17353/2070-5379/39_2018 |
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