Description of the Condensate Resource Base of the Gazprom Group
In the nearest decades the deposits containing large amounts of gas condensate - a very valuable resource for the petrochemical industry - will be the main backup for increase of the resource base. Its cost can significantly increase the economic efficiency parameters of development. Largest dry gas deposits confined to shallow depths and reservoirs with high storage and filtration properties are at the falling production stage, and in the nearest future increase of production will occur mainly by means of putting on production of new deposits containing much gas condensate. The article gives the description of the structure of condensate reserves in the Gazprom Group on the basis of main geological and physical characteristics: depth, age, lithotype and porosity of hoisting deposits, condensate content, type of fields and deposits, reserves depletion, and design condensate recover factor. Most of deposits with condensate reserves are associated with clastic reservoirs lying at the depth of more than 2,5-3 km, where hosting formations are characterized by reduced permeability and porosity. More than a third of explored condensate reserves of the Gazprom Group is in deposits with oil margins. The design condensate recovery factor for deposits containing about a half of explored reserves of the Gazprom Group is established within the range of 0,6-0,7. The design condensate recovery factor falls for gas-condensate systems with high condensate content and low storage properties. The parameters of the condensate resource base structure and the dynamics of its change shall be taken into account for planning of resource base development activities within existing and planned gas production clusters.