Depositional systems and sequence stratigraphy analysis of the Upper Callovian to Tithonian sediments in the Central and Western Kopet-Dagh Basin, Northeast Iran

摘要: Upper Callovian to Tithonian (late Jurassic) sediments represent an important hydrocarbon reservoir in the Kopet-Dagh Basin, NE Iran. These deposits consist mainly of limestone, dolostone, and calcareous mudstone with subordinate siliciclastic interbeds. Detailed field surveys, lithofacies facies analyses at three outcrop sections were used investigate depositional environments sequence stratigraphy Middle Jurassic interval central western areas basin. Vertical lateral changes, sedimentary fabrics structures, geometry carbonate bodies resulted recognition various related tidal flats, back-barrier lagoon, shelf-margin/shelf-margin reef, slope deep-marine belts. accompanied by interbedded beach deep marine petrofacies. Field analysis, parasequences stacking patterns, discontinuity surfaces, geometries coupled relative depth variation, led six third-order sequences. The history study can be divided into two main phases. indicate platform evolution from a rimmed-shelf ramp during late Callovian–Oxfordian Kimmeridgian–Tithonian intervals, respectively. Significant vertical thickness results obtained regional correlation sequences, attributed combined effect antecedent topography differential subsidence local tectonics. Moreover, sea-level changes must regarded as major factor Callovian–Tithonian interval. Copyright © 2015 John Wiley & Sons, Ltd.