A migration imaging method using CGP stacked cylindrical waves

Abstract

In view of the seismic exploration problem of thin sand reservoirs in the Songliao Basin, this paper puts forward a migration imaging method using CGP (common geophone point) stacked cylindrical waves. By this means, seismic data should be acquired from a midpoint shooting layout system with small shot-point spacing and small geophone interval. Using such seismic data, CGP gathers are first stacked to compose a cylindrical wave section. The cylindrical wave section is migrated and imaged by means of the ray path downward continuation of the down-going wave and the wave equation downward continuation of the upgoing wave. The results from the modeling analysis and the data processing of the TK8157 seismic line in the Songliao Basin shows that the proposed migration imaging method has higher seismic resolution and fidelity. Furthermore, the proposed method is proven to be more effective for discovering small sand bodies, small faults, stratigraphic pinch-outs, and so on.