3D multicable adaptive interpolation and deghosting: Optimum broadband solutions for wide-azimuth and full-azimuth acquisition
Hongyan Li, Alexander Zarkhidze, Neeraj Duhoon, Philippe Caprioli · 2017
Broadband processing that involves both source and receiver deghosting has been widely used to extend the bandwidth of marine seismic data. In parallel, wide-azimuth (WAZ) and full-azimuth (FAZ) acquisition have become common to improve both signal-to-noise ratios and the illumination of complex structures. In order to achieve high-quality broadband marine data, we demonstrate that deghosting should be 3D effects and performed on multiple cables to properly handle ghost effects on waves propagating in complex structures and recorded with 3D WAZ/FAZ acquisition geometries. Typical marine acquisition in the Gulf of Mexico (GoM) has large streamer spacing of 100-120 m. Due to the sparsity of the cable spacing, multi-cable simultaneous interpolation and deghosting is implemented to create an unaliased 3D tau-P transform in both inline and crossline directions to better resolve out-of-plane ghost effects. At the same time the interpolation, as a side product, is able to produce high-quality virtual cables between the real sparse cables. The final high-resolution broadband imaging is achieved with enhanced amplitude spectrum and spatial data sampling. The enhanced resolution of the broadband data assist seismic interpretation of shallow geology anomalies including faults, mass transport, gas pocket, bottom simulating reflectors (BSR), and others, which are all critical for shallow drilling hazard prediction. Moreover, the deghosting enhances low frequencies, which improves the imaging of steep-dip and subsalt events. Herein, we present a case study from Walker Ridge area in the northern GoM. Presentation Date: Monday, September 25, 2017 Start Time: 3:30 PM Location: 360A Presentation Type: ORAL