Application of new method of spectrum decomposition and seismic inversion in research of beach-bar sand sedimentary characteristics and development model

Key words:  beach-bar sand  spectrum decomposition  seismic inversion  monochromatic slice  reservoir prediction

Abstract:

Based on 3D high-precision seismic information and seismic sedimentology principle, beach-bar facies reservoir of Upper Es₄ formation of Boxing Oilfield were predicted by using spectrum decomposition,seismic inversion of seismic sedimentology and geology, logging, borehole logging information. The results show that 30 Hz is the optimum tuning frequency. Sandstone is the most development in the middle part of Upper Es₄ formation and its sedimentary characteristic is remarkble. Beach-bar sand boby undergoes obvious "sandstone sedimentation under the water regression period" evolution process. Beach-bar sedimentary model shows its giving priority to "bar" sand sedimentation under the water regression period, while "beach" sand and shallow lake mud sedimentation under the water transgression period. Hydrodynamism and palaeotopography condition are the main control factors of beach-bar sedimentation.