S.A. Kaplan, M.Ya. Finkel’shtein, M.Yu. Smirnov, V.A. Spiridonov
Methodology for geophysical methods integration in regional stage of geological exploration
Key words: integration; regional stage of research; seismic exploration; gravimetry; gravity field corrections; three-dimensional model.
For citation: Kaplan S.A., Finkel’shtein M.Ya., Smirnov M.Yu., Spiridonov V.A. Methodology for geophysical methods integration in regional stage of geological exploration. Geologiya nefti i gaza. 2021;(3):111–121. DOI: 10.31087/0016-7894-2021-3-111-121. In Russ.
The article discusses approaches and methods for integrating seismic and gravimetric data in regional oil and gas operations. The informational basis of the regional stage is described and the necessity of integrating information coming from different methods is substantiated. The difficulties arising from the use of gravimetry data, which lead to the need for a twostage technique for its use, are explained. In the first stage, based on the geometry of deep seismic boundaries, a large-scale model of the sedimentary cover and the earth’s crust is constructed, which ensures the reduction of the gravity field to a depth in the vicinity of the crystalline basement. In the second stage, the data are integrated within the sedimentary cover based on the reservoir depth-velocity model, taking into account seismic stratigraphic and seismic facies interpretation of seismic sections. The use of gravimetric information makes it possible to more reasonably interpolate and extrapolate structural surfaces in the space between seismic lines, as well as predict intrusive bodies position and shape. The result of a two-stage integration of seismic and gravimetry data is represented by 3D thick-layered model described by matched geometric, velocity, and density characteristics. The methodology is based on the technological capabilities of the INTEGRO Geographic Information System. An example of the application of the described technique is presented.