Year: 2023 First Published: IMAGE Authors: Tiexing Wang, Arash JafarGandomi, Hakon Aune Summary In vibrator technology, the presence of harmonics is a common phenomenon. Several authors considered the problem of removing or utilizing harmonics from land vibrator data. However, marine vibrator (MV) harmonics are rarely discussed. Although much weaker than the fundamental signal, we show […]

Year: 2023 First Published: EAGE Authors: R H Telling, A JafarGandomi, R M Laws, S Grion Summary This paper examines a method of signature estimation for marine vibrators that jointly uses measurements of the acceleration of the vibrating surfaces and the pressure in the near-field to invert for notional sources. The method enables an optimal […]

Year: 2023 Authors: Jing Sun, Arash JafarGandomi, Julian Holden Summary In ocean bottom seismic (OBS), combining records from the hydrophone (P-component) and vertical geophone (Z-component) allows for the elimination of receiver-side ghost and water-layer multiples. Apart from environmental noise that affects both of them, the Z-component is often contaminated by an additional type of shear-like […]

Year: 2023 First Published: EAGE Authors: C Strand, J Canning, D Eastwell, C Rudling, K Purcell, R Bartlett Summary It is internationally recognised that the safest method for permanent disposal of higher-activity radioactive waste is in a deep, underground Geological Disposal Facility (GDF). The UK has, along with several countries, embarked on a project to […]

Year: 2023 First Published: IMAGE Authors: Peter Scholtz*, Truong Nguyen and Arash JafarGandomi Summary Corrections for source and receiver positioning and clock-drift errors are early steps in the processing of ocean bottom seismic (OBS) data. We have implemented an optimization process to correct jointly for these errors, while a water velocity model gets updated from […]

Year: 2023 First Published: IMAGE Authors: Peter Scholtz, Truong Nguyen, and Arash JafarGandomi Summary Correcting for source and receiver positioning and clock-drift errors are early steps in the processing of ocean bottom seismic (OBS) data. We have implemented an optimization process to correct jointly for these errors, while a water velocity model gets updated from […]

Year: 2023 First Published: EAGE Authors: Susanne Rentsch*, Jim Thompson, Robbin Adams, David Moore, and Ronny Raborn Summary OBN survey numbers have been steadily increasing over recent years. However, those surveys come with new challenges compared to streamer or cable acquisitions. One of the main challenges is that most nodes are autonomous and cannot communicate […]

Year: 2023 First Published: EAGE Workshop Authors: Rentsch Summary Recently, towed marine seismic acquisitions are intently focusing on enhancing low frequencies on the source and receiver side. In this workshop we document our journey to enhance the low- frequency output of airgun arrays for towed marine seismic acquisitions. We show the physical effect of (partial) […]

Year: 2023 First Published: EAGE Authors: Chris Purcell and Lorenzo Casasanta Summary The subsurface of the Caspian Sea presents many complexities in the near surface, such as active mud volcanoes and gas chimneys that make velocity model building and seismic imaging challenging. In this work we showcase the impact of modern broadband processing and high-end […]

Year: 2023 First Published: EAGE Workshop Authors: Melbo Summary The first marine vibrators were introduced in the 1960’s. However, compared to airguns these early vibrators were bulky, slow and failure prone. Consequently, airgun technology has dominated the market for more than 50 years. Over the last few years, there has been a renewed interest in […]