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Publication - Professor Anthony Mulholland

    Using laboratory experiments to develop and test new Marchenko and imaging methods

    Citation

    Filho, CAdC, Tant, KMM, Curtis, A, Mulholland, A & Moran, CM, 2018, ‘Using laboratory experiments to develop and test new Marchenko and imaging methods’. in: SEG Technical Program Expanded Abstracts 2018. Society of Exploration Geophysicists, pp. 5520

    Abstract

    The Marchenko redatuming method estimates surface-to-subsurface Green’s functions. It has been employed to diminishthe effects of multiples in seismic data. Several such methods rely on an absolute scaling of the data; this is usually considered to be known in synthetic experiments, or is estimated using heuristic methods in real data. Here, we show using real ultrasonic laboratory data that the most common of these methods may be ill suited to the task, and that reliable ways to estimate scaling remains unavailable. Marchenko methods which rely on adaptive subtraction may therefore be more appropriate. We present two adaptive Marchenko methods: one is an extension of a current adaptive method, and the other is an adaptive implementation of a non-adaptive method. Our results show that Marchenko methods improve imaging compared to reverse-time migration, but less so than expected. This reveals that some Marchenko assumptions were violated in our experiment and likely are also in seismic data, showing that laboratory experiments contribute critical information to the development and testing of Marchenko-based methods.

    Full details in the University publications repository