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Under a magnifying glass: studies of the Tyumen difficult-to-recover reserves. Experience of trial, error and achievement

T. Kiryanova*,  O. Kirzeleva, M. Fedorova, R. Kopenkin, D. Klyazhnikov (Ingenix Group), A. Kalugin (LUKOIL Engineering)

Tyumen series within the West Siberian Petroleum Province contain considerable oil resources (about 3 billion tons of the current recoverable reserves). Degree of their depletion is only 7%. Until recently, the reason for low interest in reservoir development was the frequent disconfirmation of geological models and drilling of numerous dry and marginal wells.
Despite the considerable amount of accumulated information, including regional studies, and conclusions that in the vast territory the Tyumen series were formed in continental settings of alluvial plains and meandering channels, conceptual and three-dimensional digital models are still created with large assumptions/simplifications and do not reflect the complexity of pay zone structure. That is why the subsequent drilling does not support geological models.
By the example of J2 reservoir in two fields, the work presents an experience of transition from simple to more complicated geological models as a result of reprocessing and integrated interpretation of geological and geophysical information.

From foothills to the sea. The conceptual depositional model of Early-Middle Jurassic period for the northern edge of the Shaimsky Petroleum District

M. Fedorova*, O. Kirzelyova, T. Kiryanova, R. Kopenkin, D. Klyazhnikov (Ingenix Group), A. Kalugin (LUKOIL Engineering)

Thick sedimentary series potentially promising for HC deposits formation and preservation were accumulated in the Early-Middle Jurassic time in the lands of Shaimsky and neighbouring Krasnoleninsky petroleum districts; they are Sherkalinsky and Tyumen formations.  Accumulation of Sherkalinsky and Tyumen formations (J10 and J9-J2 reservoirs) occurred against the background of the territory downwarping and natural evolution of depositional settings from paleohighlands and slopes, accumulative valleys, to shallow marine environments.
Using the frequency decomposition method and subsequent RGB blending, analysis of well log diagrams, results of core lithofacies analysis, the sequential conceptual model of deposition of Early-Middle Jurassic productive series in the area of large multiplay field was created. The authors delineated the following different facies zones: slopes of highlands with proluvial fans; fluvial, lacustrine-boggy plains; subaerial and submarine delta parts; shallow-marine shore. Boundaries of separate sand bodies having different genesis were determined, they are: channels, delta lobes and front, delta distributary channels, longshore bars.

Litho-petrophysical and geophysical characterization of Lower Permian carbonate reservoirs in northern and southern Pre-Urals

D. Klyazhnikov* (Ingenix Group), V. Pankov (Lomonosov Moscow State University)

Lower Permian carbonate deposits are widespread on the territory of the Russian plate, including on its Eastern outskirts, within the Urals. They are characterized by extensive lithofacial heterogeneity, significant variability of porosity and permeability, the predominant development of low-pore reservoirs. The paper presents a comparative analysis of the lower Permian carbonate deposits confined to the Northern and southern parts of the pre-Ural regional deflection. A similar lithological structure of sediments, due to the common spatial and temporal features of the territory, allows to perform such a comparison. For the analysis, the results of the core study and GIS data on the Kochmes field located in the Northern part of the Urals, and a number of areas in the South – Nagumanovskaya, Peschanaya, Vershinovskaya etc. On the basis of sequence stratigraphy method involving sedimentological and lithological-petrographic study of the core, the main facies of the situation were identified. Evaluation of the lithological volume model and permeable identification were carried out using lithodensity log, spectral gamma-ray log, cross-dipole array sonic log etc. The most high-capacity rocks are confined to facies of organogenic buildings in the southern part of the pre-Ural regional deflection, with a predominance of porous-cavernous and porous reservoirs.
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