We tested characteristic elements of the Cenomanian bed in the N petroleum field. In this work, we present the results of an investigation of an element of rock bed represented by a parallelepiped 200 m × 200 m × 132.8 m in size. The element was cut out from the roof to basement of the productive oil bed. The oil-saturated portion accounts for 86.6 m of the total thickness of 132.8 m, and the remaining 46.2 m corresponds to the aquifer.
