Hybrid boundary full-wave-equation depth migration based on dual-sensor acquisition system and its application

Abstract

The dual-sensor acquisition system arranges two-layer geophones on the surface and their corresponding underground positions, and receives the wavefield simultaneously for accurately solving the full-wave equation. Theoretically, using the two-layer wavefield data obtained by the acquisition system, the two-way wavefield extrapolation can be realized in the depth domain without approximate processing of the wave equation, and the migration algorithm based on the dual-sensor framework has better amplitude preservation. However, limited to the acquisition expenses and difficulties, the spacing of the two-layer sensors is hard to match the actual migration step in real data acquisition. Meanwhile, poor geophone coupling and nonstandard data processing procedures would also lead to unsatisfied imaging results. Thus, some schemes suitable to dual-sensor data, including hybrid boundary wavefield extrapolation strategy, data processing, quality monitor, are proposed to handle these issues, using the delay time difference as a main analyzing object. The numerical simulation and actual data verify the feasibility and effectiveness of the proposed method.