Delineation and Evaluation of a Carbonate Reef-shoal under the Control of Sequence Framework, Using Block A within the Pre-Caspian Basin

Ancient carbonate reef-shoals are extremely important to oil/gas production around the world, because they characterize the bedrock in which carbonate reservoir systems are predominately developed. This paper combines the evolution of the regional sedimentary setting with reservoir characteristics revealed by drilling data in Block A within the Pre-Caspian Basin. Using sequence stratigraphic analysis techniques, we establish a framework for the KT-I Member within the Upper Carboniferous unit in Block A. By combining paleostructural restoration, seismic facies characteristics, and seismic attribute analysis results of volumetric curvature and highlight volume, we delineate the reef-shoal distribution scope, and based on these results, put forward drilling proposals in Block A. Drilling results have confirmed the validity of the prediction, opening a new chapter of carbonate lithologic reservoir exploration in the study area.