In modern seismic survey design practice, all-round replacement of 2D works high-density 3D works takes place, as well as the transition from narrow-azimuth seismic surveys to high-performance wide-azimuth acquisition techniques for studying complex objects and analyzing the azimuthal parameters of subsurface. In this regard, it is necessary to thoroughly approach the planning of the field acquisition geometry in order to sel ect the optimal seismic survey for solving the geological problems, taking into account the geological structure and the depth-velocity characteristics of the section.
In recent years, Rosneft Oil Company , as part of increasing the efficiency of field seismic exploration and, as a result, exploration drilling, is introducing a set of works on designing optimal seismic surveys and finite-difference seismic modeling at company license blocks around the world. This type of work is aimed at obtaining high-quality field seismic data, which at the subsequent stages of processing and interpretation will allow to identify the target perspective objects in the wave field.
For the design of optimal 3D surveys, Rosneft Oil Company developed its own innovative approach based on a consistent multi-level refinement of the seismic survey using seismic modeling both in the ray approximation and the finite difference method in 2D and 3D realizations. This approach allows us to use the applied technologies not only for calculating the optimal field method, but also for accompanying or operative correction of acquisition geometry during fieldwork, and also at the stages of processing and interpretation for identifying and evaluating the characteristics of waves of different nature, developing an efficient processing flows and evaluation of the efficiency of the selection of search objects on the basis of synthetic data of various details.
This paper presents the application of the developed multi-level approach to the design of optimal 3D seismic surveys based on seismic modeling for the Samara region. The theoretical calculation of the parameters of the survey based on a priori information about the area is described; the efficiency of the results of 2D / 3D ray tracing and finite-difference modeling is shown with the aim of creating optimal acquisition geometry for solving the geological tasks. The application of this technique allows a more thorough approach to the planning of the field seismic surveys, which should provide the necessary quality of seismic wave registration in the geological conditions of the studying area.
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