Multicontact's trap origin hypotheses for PK1-3 formation of Vostochno-Messoyakhskoye field

Authors: I.M. Nitkaliev Ilnur, N.V. Zhuykova, A.G. Orlov, V.S. Nartymov, I.V. Kovalenko Igor (Gazpromneft-NTC LLC, RF, Tyumen), M.N. Nikolaev Maksim (Messoyakhaneftegas CJSC, RF, Tyumen)

Key words: local gas, migration,modular dynamic tester (MDT), gas-oil contact GOC.

The Messoykha project is one of the priority plans of Gazprom Neft Company. The main object of development is PK1-3 formation which contains considerable reserves of oil and gas. At this moment the field is on the development drilling stage, but new hard data (wells information) have added a number of uncertainties in the current geological concept. One of them is the problems associated with fluid distributions uncertainties within the PK1-3 formation. Such fluids distribution when appears oil and gas alternations within one formation that is confirmed by well logging researches. However, these data are insufficient for revision of all geological concept, because such problems are local. It should be noted that PK1-3 formation was accumulated mainly at continental conditions. This fact allows assuming that such gas can be closed in small local traps which are typical for this depositional environment. However, it is impossible to calculate local gas volume at this stage and therefore the influence on development can't be evaluated too. In this article the hypotheses of local gas genesis are considered and ways of gas migration are suggested.

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