--> Abstract: Mesozoic Clastic Source-Rocks and Carbonate Reservoirs of the Middle Caspian Petroleum System, by Elmira Aliyeva, Dadash Huseynov, Haji-Murad Aliyev, Akper Feyzullayev, Ibrahim Guliyev, and Ali Suleymanov; #90072 (2007)

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Mesozoic Clastic Source-Rocks and Carbonate Reservoirs of the Middle Caspian Petroleum System

Elmira Aliyeva1, Dadash Huseynov1, Haji-Murad Aliyev2, Akper Feyzullayev1, Ibrahim Guliyev3, and Ali Suleymanov4
1Geological Institute of Azerbaijan National Academy of Sciences, Baku, Azerbaijan
2AZNiPineft, Baku, Azerbaijan
3Geology Institute of Azerbaijan National Academy of Sciences, Baku, Azerbaijan
4AzNiPineft, Baku, Azerbaijan

The depositional environments of the Middle Jurassic-Lower Cretaceous terrigenous-carbonate succession in the Middle Caspian Basin are represented by marine (Upper Aalenian-Lower Cretaceous) and continental (Lower Aalenian) settings with the existence of marginal facies in the Lower and Upper Aalenian as well as the Kimmeridgian-Tithonian and Valanginian (facies of lagoons in the north-west part of the region under study). Several orders of variation in stratal architecture have been recorded throughout the studied succession. The first-order fining upward trend detected in the Middle Jurassic – Lower Cretaceous section confirms the transgressive character of the basin. However, frequent environmental changes testify to rapid sea-level fluctuations expressed in short-term depositional cycles. An investigation of organic matter (OM) distribution demonstrates a strong depositional control. The highest amount of TOC in a continental environment was recorded in swamp sediments. In a marine setting the maximum concentrations of TOC were determined in the shelf zone. The amount of TOC in mudstones varies on average from 0,44 % in the upper shoreface to 0,96 % in lower shoreface; 1,47 % - 1,67 % - outer shelf and 0,9 % - deepwater part. Organic matter concentrations decrease upward through the Middle Jurassic succession. The type of organic matter in the studied sediments is in full agreement with the depositional environment interpretations - type III in the continental-marginal Jurassic succession and type II in Cretaceous sediments. The OM maturity degree strongly varies within the area under study. All the main oil-gas fields in the western flank of the Middle Caspian Basin are associated with fractured carbonaceous organogenic Upper Jurassic-Neocomian reservoirs.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece