Insights from DAS VSP Converted Wave Imaging in Complex Carbonate Geological Settings

In a survey with shallow water environment, marine streamer data, Ocean Bottom Node (OBN) data, 3-C Vertical Incidence Vertical Seismic Profiling (VIVSP) data and 3D Distributed Acoustic Sensing (DAS) VSP data were acquired.

The 3D VSP survey utilizing a wireline fiber-optic cable was conducted in a deviated well. Despite the single-component (1-C) limitation of DAS recording, the acquired 3D DAS VSP data captured both P-waves and notable converted waves, resulting from mode conversions within a shallow, high velocity carbonate layer.

This paper highlights key findings from the analysis of the field 3D DAS VSP data and examines the possibility of using converted waves for DAS VSP imaging in a geologically complex setting.