A Case Study of Joint Seismic and 3D DAS VSP Acquisition and Processing in Eastern China

A production well has been selected for comparing the DAS VSP data placed inside the tubing and the casing, normal fibre and weak fibre Bragg grating (FBG) VSP data ( Yang et al., 2021 ). The 72km2 surface and DAS VSP seismic data has been acquired by the fibre optical cable inside casing. In the data processing stage, the idea of surface and borehole seismic synchronization processing has been proposed, which utilizes the advantages of DAS VSP and surface seismic and applies them, and comparing the VSP and seismic stacking has been used for quality control method. The final migration results of seismic and DAS VSP are greatly improved. Besides, the consistency of amplitude and wavelet between seismic and DAS VSP was achieved before stack, laying the foundation for surface and borehole seismic migration.