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Structural-tectonic Interpretation of 3D Seismic Data on Ježevo Oil Field

In order to define the structural-tectonic relations of the Ježevo oil field and establish new hydrocarbon reserves, we have used Petrel software to create a three-dimensional seismic interpretation. So far, the explorations have been based exclusively on 2D seismic data ; however, the specific feature of this particular research is that we have been used both the borehole data and 3D seismic data. In the Ježevo field, the carriers of the economically significant acumulations of hydrocarbons are the collectors of the thin Gama sandstone series. Based on the well logs and the data from the cores, the lithology log plot have been made and both the top and bottom of the Gama sandstone series have been identified. E-log marker Rs7 (Sarmatian/Pannonian), Rs5 (Lower/Upper Pannonian), Z' (Pannonian/Pontian), Rφ (Lower/Upper Pontian), and the structural-tectonic interpretation of the 3D seismic data have also been made. For reliable settings of lithological limits on the seismic section, the one-dimensional modeling (synthetic seismogram) has been used. We have created a new model that is based on 3D seismic interpretation and contains the tectonic complex limiting the reservoir. In order to achieve a more accurate interpretation of seismic horizons and fault complex, we have used seismic trace and horizon attributes, as well as continuity/discontinuity attributes. With the help of the above mentioned, the information about the lithologic diversity in the sedimentary bodies and the lateral changes of the reservoir characteristics have been gathered.

Structural-tectonic interpretation; 3D seismic data; Petrel; Ježevo oil field; seismic attributes

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