The Oil Reserves Localization of Low Permeable Clastic Reservoirs with Order Layered Structure at the Mature Production Fields

The Studying of reservoir heterogeneities is used not only to calculate oil in-place but also to create oil-field development plan and regulate effective production. Three types of heterogeneities: microlayered, layered (textural) and granulometric (macrolayered) heterogeneities play a major role in processes of oil field development of clastic reservoirs. The localization’s process of oil reserves at low permeable high heterogeneous clastic reservoirs with order layered structure was studied. As a result of the study of depositional environments and facies of the sandstones of the reservoir, regional stress, current state of the oil field development and the analysis of the operation process of injection and production wells, undeveloped reserve zones for infill drilling of new wells and sidetracks with multi-stage hydraulic fracturing between rows of injection wells were identified. It should be noted that model of uniformly radial distribution of the injected water in sandstone reservoirs with order layered structure does not take into account the complex influence of heterogeneities. And thus, assessment the distribution of injected water and calculation of oil reserves are not correct. The authors justify the accounting of this set of factors in the construction of the hydrodynamic model of a highly heterogeneous clastic reservoir with order layered structure and in the control of its development.