Spatiotemporal Variations and Kinematics of Shale Mobility in the Krishna-Godavari Basin, India
Mainak Choudhuri, Debajyoti Guha, Arindam Dutta, Sudipta Sinha, Neeraj Sinha, 2011. "Spatiotemporal Variations and Kinematics of Shale Mobility in the Krishna-Godavari Basin, India", Shale Tectonics, Lesli J. Wood
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Tertiary sediment loading on the Late Jurassic-Early Cretaceous passive-margin rift fills in the offshore Krishna-Godavari basin generated different episodes and patterns of mobile, shale-cored structures from the Paleocene to Pliocene. The Paleocene-Eocene shales in the deeper shelf and upper slope areas moved as a series of thrust slices, whereas the younger Miocene-Pliocene shales moved as individual bulges (diapirs). Lithological variability and shifting depocenters, prevailing tectonic conditions, and available space in the system for translation in space and time all influenced the spatiotemporal distribution of the shale-cored structures. A relation is also observed between the location of the toe thrusts and shale diapirs, and the basement highs and escarpments. Two-dimensional palinspastic restorations, incorporating all the above variables, confirm the linkages between the sediment depocenters, growth faults, and mobile shales in the Krishna-Godavari basin.
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The phenomenon of rocks moving under their own means has always fascinated both scientists and nonscientists alike. The 2006 AAPG Hedberg Conference on Mobile Shale Basins was held in response to a need to gather industry and academic communities in a common forum to address the very existence of mobile shales. Stimulating and informative discussions at that Conference led to this special volume on shale tectonics. AAPG Memoir 93 documents shale tectonics from a variety of basins around the world, including the southern Beaufort Sea; the Krishna-Godavari Basin, India; eastern offshore Trinidad; offshore Brunei; and along the westernmost portion of the Mediterranean Sea. The book also provides information on the petrographic framework, behavior, geometries, and geodynamic models of shales. Publication of this Memoir coincides with a growing interest in shales as hydrocarbon reservoirs, and will add to the body of literature that significantly addresses both extrusive and intrusive shales.