DAS VSP Converted Wave Imaging in Carbonate Settings

This document is a technical report that discusses the challenges of pre-carbonate imaging in complex geological settings, particularly those involving shallow, high-impedance carbonate layers. It outlines the difficulties encountered in conventional imaging methods due to significant mode conversions that limit the penetration of primary energy. The report presents findings from a 3D Distributed Acoustic Sensing (DAS) Vertical Seismic Profiling (VSP) survey, which utilized various data acquisition techniques including marine streamer and Ocean Bottom Node (OBN) data. The analysis revealed that mode-converted waves, often dismissed as noise, can provide valuable insights into reservoir structures beneath carbonate layers. The document details processing workflows designed to leverage these converted waves for improved imaging, emphasizing the importance of isolating wavefields to enhance data quality. The findings suggest that utilizing mode-converted energy can significantly enhance pre-carbonate imaging and open new exploration opportunities in complex geological environments.