Miocene to Quaternary Sequence Stratigraphy of the South and Central Caspian Basins

摘要: The oil industry has been active in Azerbaijan for centuries, and the Apsheron Peninsula, sill, onshore, shelf margin of are considered mature areas exploration. However, large offshore Caspian, including deep-water South Turkmenistan shelf, Central Caspian still exploration frontiers. An understanding stratigraphy reservoir rocks seals these could significantly reduce risk. interplay paleo-Volga, paleo-Amu Darya, paleo-Kura deltas, since late Miocene, provides first-order controls on prospect distribution. A continuous trend coastal onlap western exists basins from upper Miocene to lower Pliocene, with units over Cretaceous rocks. These trends associated an overall rise lake level productive series. three delta systems exhibit significant differences depositional style timing, reacting different ways rising level. Strong progradation Darya occurred eastern Basin. This is related Pliocene deposition Red series (equivalent Pereryva Surakhany suites Azerbaijan). Thus, prograded during level, controlled primarily by sediment supply. During suite, paleo-Volga aggraded region (northern Caspian). transgressive marks Basin Balakhany may indicate backstepping at that time. In system, southwest Basin, a Sabunchi (lower Pliocene). downlap surface developed base middle suite. along correlates part progradational phase basin. prograding wedge concurrent Akchagylian (upper impact supply Alborz Mountains Iran not be evaluated because lack data. Climatic fluctuations did exert dominant control sedimentation through their direct both levels entire Productive Series reflects golden climate, when Earth, overall, was much warmer than today. addition, shorter time scales, stratal pattern high-frequency climatic cycles. Late lowstand deposits dominated aggradational braided streams braid deltas. Transgressive highstand consist extensive shales interbedded silts sands. can act as pervasive permeability barriers baffles reservoirs. Very little sand appears have entered periods falling