Green’s function retrieval with Marchenko and inter-source seismic interferometry method for drill-bit seismic while drilling

Abstract

Various researchers have shown that the decomposed wave-field can obtain a more accurate Green's function with seismic interferometry (SI). In the deviated and horizontal wells, traditional methods based on the difference of apparent velocity in the vertical well fail to separate downhole drill-bit source wave-field into up- and downgoing components because of the similar moveout. In recent years, one-way Green's function retrieval with the Marchenko method has been successfully applied to borehole data. Inspired by a data processing method that utilizes surface and borehole data to separate the wave-field, we have recently developed a wave-field decomposition scheme that only uses the surface recordings. The advantage of this method is that it does not need the knowledge of media properties, which is completely data-driven. Then we use the decomposed wave-field to retrieve the reflection response around the well with inter-source SI methods. The numerical experimental results show that the Marchenko method can accurately separate the wave-field. Simultaneously, the response retrieved by inter-source SI is close to the target area, and the influence of the irrelevant formation is removed.