Published December 2025, Pg. 4-9
Section: Geology and geophysics
UOT: UOT 553.78
DOI: 10.37474/0365-8554/2025-12-4-9
Comparative analysis of the chemical composition of reservoir waters of the Sadan area of the Siyazan monoclinic oil and gas field
N.V. Aliyeva - “Oil-Gas Scientific Research Project” InstituteThe article comprehensively investigates the geological structure, hydrogeological features and chemical composition of the Sadan area located within the Siyazan monocline.
From a tectonic point of view, the Sadan area is located on the northeastern wing of the Tengi-Beshbarmag anticlinorium, and is characterized numerous discontinuous faults that divide the structure into a number of blocks. The geological section includes Upper Cretaceous, Paleocene, Eocene, Oligocene, Lower and Middle Miocene sediments. The main reservoir rocks consist of limestone, sand and sandstone.
Within the framework of the study, 102 water analyses were conducted based on 93 wells in 17 geological horizons of the site, the formation waters were mainly represented by the calcium–chloride, magnesium–chloride and sodium–bicarbonate (SB) types. According to the analysis results, the mineralization degree of groundwater varies between 3522–52913 mg/l. The lowest mineralization was recorded in the Maykop formation, and the highest mineralization was recorded in the Chokrak horizon. This difference is associated with the lithological composition and hydrogeological properties of the rocks: sandy rocks with high porosity and permeability (Maykop) are characterized by weakly mineralized waters, and marl and claystone rocks with low permeability (Chokrak) are characterized by highly mineralized waters.
The results show that the chemical composition and mineralization level of groundwater in the Sadan area are directly related to the geological structure, especially the lithological characteristics of the rocks and discontinuous faults. At the same time, these hydrogeochemical characteristics also affect the distribution conditions and production potential of oil and gas. The results of the study have scientific and practical significance in terms of oil and gas resource exploitation, water supply and environmental risk assessment.
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