The complexity of carbonate reservoirs is a significant factor affecting their production, and the depositional environment is the primary controlling factor for the distribution of carbonate reservoirs. This paper conducts research and analysis on the depositional characteristics of carbonate reservoirs based on core samples from Carboniferous carbonate reservoirs in the eastern margin of the Precaspian Basin and various geological data. Identification and statistics are carried out from multiple aspects, including mineral composition, rock type, grain type, and fillings, to determine that the area is characterized by carbonate platform deposition. The upper strata are developed with limestone and dolomite, while the lower strata are dominated by limestone.
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