Browsing by Author "Jaiswal, Priyank"

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    Methods for concurrent generation of velocity models and depth images from seismic data
    (2014-12-02) Jaiswal, Priyank; Zelt, Colin A.; Rice University; United States Patent and Trademark Office
    In various embodiments, the present disclosure describes methods for processing seismic data to concurrently produce a velocity model and a depth image. Various embodiments of the methods include: a) acquiring seismic data; b) generating a shallow velocity model from the seismic data; c) generating a stacking velocity model using the shallow velocity model as a guide; d) generating an initial interval velocity model from the stacking velocity model; and e) generating an initial depth image using the initial interval velocity model. The methods also include iterative improvement of the initial depth image and the initial interval velocity model to produce improved depth images and improved interval velocity models. Improvement of the depth images and the interval velocity models is evaluated by using a congruency test.
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    Seismic characterization of a gas hydrate system in the Gulf of Mexico: A novel approach for evaluating high-resolution wide-aperture data
    (2002) Jaiswal, Priyank; Zelt, Colin A.
    Gas hydrates were discovered in a mud diapir in the leased block Mississippi Canyon 798 - Gulf of Mexico, through piston coring. Subsequently, a seismic experiment was set up to investigate the dynamics behind the hydrate formation. Wide aperture seismic traveltime data obtained from the experiment have been inverted to estimate 2D P-wave velocity models of the five shot lines. The results from modeling indicate the presence of free gas in regions that show up as zones of high reflectivity on the reflection profiles. The topography of the study area suggests presence of active salt bodies, which in turn, makes it plausible for the gas in the Mississippi Canyon 798 to have deeper sources.