INCLINOMETRIC OBSERVATIONS
AT THE FIELD OF Yu. KORCHAGIN
Yu.O. Kuzmin1, A.V. Deshcherevskii1, E.A. Fattakhov1, D.K. Kuzmin2,
A.A. Kazakov3, D.V. Aman3
1 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
2 Mining College of MISIS, Moscow, Russia
3 OOO «LUKOIL-Nizhnevolzhskneft», Astrakhan, Russia
Abstract. The work purpose – analysis of the results geodeformation monitoring at the oil and gas condensate field Yu. Korchagin situated in the Caspian sea. The slopes of the base of the offshore platform are fixed with the help of inclinometers of the Inklin-2 type, AGS 5. The development of software for data collection and storage was carried out by the Shirshov Institute of Oceanology of the Russian Academy of Sciences. Processing time series inclinometer observations were carried out using specialized software tools developed in IPE RAS (package WinABD). The amplitudes of tidal and seismic effects are estimated, the dynamics of changes in the position of the mining platform in time is described. Periodic fluctuations in the roll with a period of 24 hours and an average annual amplitude of 0.005° and a differentiation with a period of 12 hours and an average annual amplitude of 0.001°, presumably associated with breezes, were revealed. It is shown that gravitational-tidal effects (Lunar-Solar static and sea tides) do not have a significant impact on the recorded slopes of the platform. The results of mathematical modeling of sea bottom deformations due to field development are presented and it is shown that the maximum settling amplitude is of the order of 3 mm. A model of a deformable reservoir-reservoir was considered, which includes two oil-saturated reservoirs: the Neocomian substage and the Volzhsky stage. Evaluation of heel and trim at the location of the platform showed that the roll due to the mining can reach 6∙10–8 (16 angular milliseconds), and the trim – 8∙10–8 (12 angular milliseconds). Both these values are many times less than the resolving power of inclinometers, and actually observed deformations associated with other causes. The conclusion about the absence of critical rolls and differents of the mining platform is substantiated and it is shown that the developed complex of computational procedures allows a detailed analysis of modern geodynamic processes caused by the development of the field of Yu. Korchagin in constant monitoring mode.
Keywords: offshore hydrocarbon deposits, geodynamic observations,; monitoring, inclinometer, deformation processes, man-made drawdowns, modeling, time series analysis, omissions of observations, spectral-periodogram analysis, Lunar-Solar tides, seishi, Caspian sea.
About the authors
KUZMIN Yuri O. – Ph. D. (phys. and math.), professor, head of a laboratory, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Moscow, Russia. Tel.: +7 (499) 254-65-65.
E-mail: kuzmin@ifz.ru
DESHCHEREVSKII Alexey V. – Ph. D. (phys. and math.), leading researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Moscow, Russia. Tel.: +7 (499) 254-90-35.
E-mail: adeshere@ifz.ru
FATTAKHOV Evgeny A. – junior researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Moscow, Russia. Tel.: +7 (499) 254-91-35. E-mail: fea@ifz.ru
KUZMIN Dmitry K. – postgraduate student, Mining College of MISiS. Moscow, Russia.
Tel.: +7 (985) 439-88-72. E-mail: Dimak1292@mail.ru
KAZAKOV Alexei A. – first deputy general director – chief engineer, OOO «LUKOIL-Nizhnevolzhskneft». Astrakhan, Russia. Tel.: +7 (8512) 40-28-00. E-mail: astr-office1@lukoil.com
AMAN Denis V. – chief of surveyor services – head of the department, OOO «LUKOIL-Nizhnevolzhskneft». Astrakhan, Russia. Tel.: +7 (8512) 40-28-39. E-mail: Denis.Aman@lukoil.com