Optimization of Exploration on Central Uvat Territory

Last 15 years the territory of Central Uvat in the south of West Siberian region is an area of exploration. 16 oilfields with 100 BBE were discovered for this period. Characterized sediments are related to Tyumen formation of Middle Jurassic. Major prospects are associated to Upper part of Tyumen Fm (units U2, U3, U4). Sedimentation processes of these sediments are of estuary-deltaic type. Key limiting feature for reserves volume is quality of reservoirs, its vertical and lateral variability in lithology, porosity, permeability and difficulties in prediction of distribution. It caused of searching of non-typical decisions for exploration process. This article demonstrates one of them. The base of it is complexation of all information about the fields, more exactly seismic, sedimentological and mineralogical core analysis, well logs. This method has become the base of successful exploration. Investigation of the territory allows to define following geological properties: abrupt facies variability which caused lenticular structure of reservoirs, lithology-tectono-structural type of traps, absence of coincidence of zone of high porosity with zones of high permeability. Moreover, investigation makes possible to explain changes in oil water contact between the blocks of fields, estimate prospects of the territory and to define the orientation of future exploration