The article describes the theory of "clamped" water to justify the position of the oil-water contact of the reservoir, exposes in detail the experience of applying this theory on the example of an oil reservoir in Famennian organic deposits of the Vostochno-Lambeyshorskoye field of the Komi Republic.
During the field development, geologists have encountered a problem of different oil-water levels established in different parts of the structure, which is determined by well data with a high degree of confidence.
The analysis of reservoir pressure data shows, that the separation of the reservoir into tectonically shielded blocks with different levels of water-oil contact is impossible.
According to the results of seismic facies modeling and sequence stratigraphy, there were not identified any significant channels that could separate the reservoir by area.
The solution to the problem of substantiating the oil-water contact was found by applying the theory of "clamped" water. The idea of this theory is that during the migration of hydrocarbons into the trap, controlled by lithology and faults, there remain the so-called hydrodynamically isolated "pockets" (hereinafter referred to as "pockets") in which the formation water is sealed with oil and the oil-water contact is fixed at the level of the structure bend. The article describes the mechanism for the formation of such "pockets".
In the issue, a new conceptual model of the Famennian reservoir of the Vostochno-Lambeyshorskoye field was created as a layer-uplifted deposit, controlled by lithology, with different horizontal oil-water levels. The oil-water level is gradually increasing from north to south, along the path of hydrocarbon migration from the source rock to the reservoir. Oil-water levels are controlled by structural inflections defined on the maps of the reservoir bottom.
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