Tezislər / Theses

Supervisor: Associate Professor Gasham Zeynalov 
Keywords: 
petroleum system, deposition, reservoir, source rock, volcanogenic sediments 
The Yevlakh-Aghjabedi basin is located within the Kura intermountain 
mega basin, borders in the north-east with the Goychay-Saatli uplift zone, in 
the south-west with the Lesser Caucasus foothill fault, in the north-west with 
the Shamkir palaeo-uplift, and in the south-east through the Araz transverse 
fault. The deepest place of this basin on the surface of the pre-Jurassic 
crystalline basement is located between the lower reaches of the Tartar and 
Khachinchay rivers. 
In the northern-east part of the Yevlakh- Aghjabedi basin (Muradkhanly, 
Zardab, Jafarli fields) Paleogene-Cretaceous volcanic rocks overlaid by 
Neogene-Quaternary sedimentary deposits, are distributed over a wide 
stratigraphic range [Yusifov & Aslanov, 2018].

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THE 3
rd
 INTERNATIONAL SCIENTIFIC CONFERENCES OF STUDENTS AND YOUNG RESEARCHERS 
dedicated to the 99
th
anniversary of the National Leader of Azerbaijan Heydar Aliyev
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The southwest part of the basin has a very complicated deep structure. 
This region is characterized by the incompatibility of the structural plans of 
the Mesozoic, Paleogene-Neogene and Pliocene deposits. This affects the 
efficiency of the exploration of oil and gas fields.
Oil and gas reservoirs of the Yevlakh-Aghjabadi basin are associated 
mainly with the Upper Cretaceous, Eocene, Maykopian (Oligocene-Lower 
Miocene), and Chokrak (Upper Miocene) deposits. Commercial oil flows 
were obtained from effusive (andesites, basalts, porphyrites) and carbonate 
rocks of the Upper Cretaceous in the northeast part of the basin (Muradkhanly, 
Zardab fields), and oil and gas accumulate on the open surface of effusive 
rocks in the reservoir of complex type as fractures, caverns, etc. The 
Muradkhanli oil field related to effusive volcanogenic rocks is currently under 
development. Although oil and gas flows and manifestations were obtained 
in some structures [Sovetlar, Borsunlu, etc.] from the fractured carbonate 
rocks of the Upper Cretaceous, their commercial importance was not 
revealed [Klosterman et all.,1997; Suleymanov et all, 2006; Kocharli, 2015].
The commercial oil content of the Eocene reservoir rocks belongs to the 
Middle Eocene tuffogenic-clastic facies in the north-eastern part of the basin 
in Muradkhanli, Jafarli, and Zardab fields. On the south-western part of the 
basin, the oil content of Eocene deposits was found in Gazanbulag, Godakboz, 
and Borsunlu fields. 
The oil and gas content of the Maykopian strata is mostly observed in 
the southwestern part of the basin. Oil fields were discovered in Naftalan, 
Gazanbulag, Ajidara, and Tartar structures from sand-dominated horizons in 
the lower section of the Maykopian suits. Also, small oil flows were also found 
in the sand-rich layers, cracked dolomite, and marl layers of Chokrak 
deposits in the Muradkhanli field. 
In the section of the Upper Eocene, thick shale rocks are present in the 
basin. In the most buried part of the basin - Sovetlar, Eastern Aghjabedi, 
Shirvanly and other areas, the thickness of shale rocks increases up to 700 
m. These rocks are considered high-potentially source rock for hydrocarbon 
generation with rich in organic matter.
Carbonate rocks of the Lower Eocene also do not have enough 
volumetric capacity and permeability for hydrocarbon accumulation. However, 
the Lower Eocene impermeable formation is regionally developed seals for 
Upper Cretaceous oil fields and these deposits having a thick shale layer 
underneath with rich in organic matter are also potentially oil-generated rocks 
for the Middle Eocene reservoirs. 
Thus, the analysis of structural-tectonic and lithofacies criteria show that 
Cretaceous, Eocene, Maiykopian, and Chokrak deposits have favorable 
geological conditions for the formation of oil and gas fields in the Yevlakh-
Aghjabedi basin.

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