Waveform tomography of a 2D land data set acquired along a crooked line with rough topography

Rie Kamei, Taka Miyoshi, R.G. Pratt, M. Takanashi, S. Masaya

    Research output: Chapter in Book/Conference paperConference paper

    Abstract

    We apply Laplace-Fourier 2D and 2.5D waveform tomography to a challenging wide-angle land data set from a geologically complex region in Japan. The survey line is crooked (up to 500 m deviation from the 2D line over the 16 km line length), and the area contains significant topographic relief (up to 400 m) and near-surface weathering layers. The lack of reflections previously prevented conventional reflection processing. We demonstrate that 2D acoustic waveform tomography is capable of extracting a reliable velocity model from refractions and wide-angle reflections with carefully designed data-preconditioning and inversion strategies. Sources and receivers are projected onto a 2D plane without preserving offsets: we eliminate traces where errors in offsets are large. We restrict the inversion to phase information at lowest frequencies, and discretize the model with a fine grid, in order to minimize the effects of the crooked line and the topography. We use balanced data amplitudes (using surface-consistent static deconvolution) to conduct the source estimation. We extensively validate the obtained velocity model by comparisons with a well log and observed waveforms, through scrutiny of the resulting reverse-timemigration image. An additional test with 2.5D waveform tomography demonstrates that 2D waveform inversion is adequate for these data.
    Original languageEnglish
    Title of host publication76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy
    Place of PublicationAmsterdam, Netherlands
    PublisherEAGE Publishing BV
    Pages4110-4114
    Volume1
    ISBN (Print)9781632666949
    DOIs
    Publication statusPublished - 2014
    Event76th European Association of Geoscientists and Engineers Conference and Exhibition 2014 - Amsterdam, Netherlands
    Duration: 16 Jun 201419 Jun 2014

    Conference

    Conference76th European Association of Geoscientists and Engineers Conference and Exhibition 2014
    CountryNetherlands
    CityAmsterdam
    Period16/06/1419/06/14

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