Monitoring of air-gun source signature directivity

摘要

In this paper, we propose to reconstruct and monitor the three-dimensional far-field signals radiating from air-guns sources during marine seismic acquisitions. The far-field signature (at vertical incidence) is estimated and monitored through several indicators in the time and frequency domains. The lateral directivity is calculated from an accurate estimation of the source array geometry. The actual air-guns positions are retrieved from inversion of joint near-fields recordings of starboard and portside source arrays. The three-dimensional directivity is then monitored with an image registration metric. Monitoring is carried out onboard for quality control of the seismic source stability. The reconstructed far-field signature can be used for shot-to-shot deconvolution.