Print this pageFirst Experience of Use of Detailed Geological-Commercial Model of the Orenburg Oilfield for the Planning of Development of Hard Recoverable Stocks of Gas
By
M.A. Politykina1, W.E. Kan2, A.M. Tiourine1
(1) VolgoUralNIPIGas, Orenburg, Russia (2) VolgoUralNIPIGas,
The Orenburg oil field and gas is dated to carbonated adjournment of the
Carboniferous-Low-Permian age; in a powerful productive section (the thickness
reaches up to 500 <m) it is allocated three operational objects divided by packs
of dense practically impenetrable carbonates. Hardly recoverable stocks of gas
are concentrated in the first operational object, which permeability of
collectors on the average 1-2E10-15 m2. For 20 years of development from it
there was recovered less than 30% of initial stocks while from the lower objects
it was recovered 66%. The main reason of the weak entrainity of the stocks of
the first object in development is neglecting at planning development of its
specific geologo-commercial features. Main from them - thin porous structure of
collectors, low matrix permeability, high gypsuminity and bituminity, presence
of faults and stitolites. One of directions of increase entrainity of stocks of
the first object in development is the kickoff of horizontal trunks from low
production vertical chinks. Prime for kickoff chinks, directions and structures
of horizontal trunks are chosen on the basis of digital geologo-commercial model
of a deposit. The model is created in the program "Reservoir Modeling"done by
firm "GeoQuest Schlumberger" and contains the parameters necessary for
definition of characteristics of a section, an 
estimation
of stocks of gas and
predicted efficiency of horizontal trunks.