Types of interaction between rocks of Achimov sequence and Bazhenov formation

Abstract

Many fields in the northeastern part of Surgut oil and gas region were discovered in 1960s-1970s. Currently, because to the development of reserves of large deposits of simple structure the restoration of the resource base and maintenance of the production level of oil and gas producing organizations are the main tasks. Its implementation is possible due to the development of new territories, increasing the depth of prospecting drilling, additional exploration of deposits of complex structure.Residual reserves of deposits in the studied area are confined to Achimov sequence and reservoirs in anomalous section of the Bazhenov formation.The article considers the types of deposits in Achimov sequence with normal and anomalous structure of Bazhenov formation. The author proposes a classification of oil deposits in the fondoform part of clinoforms. This classification clearly shows the possible relationship between Achimov sequence and the underlying bituminous deposits of Bazhenov formation.Some deposits associated with reservoirs in anomalous section of the Bazhenov formation may be missed targets; therefore, additional exploration is required. Since the reservoirs of Achimov sequence and anomalous section of the Bazhenov formation have different properties, it is necessary to differentiate them when planning geological and technological measures to extract oil.