Evaluación de fluidos de reservorio en la sucesión cretácica del pozo Bijeel-7, área de Aqra, región del Kurdistán iraquí, a través de datos de registros cromatográficos de gases

This study evaluates the hydrocarbon potential of the Cretaceous succession in the Bijeel-7 (Sharafuna-1) Well, located in the Aqra area of Iraqi Kurdistan, through gas chromatographic analysis of hydrocarbons (C1–C5). The analysis focused on calculating key ratios for wetness (Wh), balance (Bh), and character (Ch) to identify hydrocarbon phases within the Shiranish, Aqra, Bekhme, Qamchuqa, Sarmord, and Chia Gara formations. The results revealed that the Shiranish Formation predominantly contains residual oil in its upper intervals and oil in its lower sections. The Aqra and Bekhme formations exhibited a mix of residual oil and oil-dominated intervals, with occasional gas or gas/oil phases identified in specific depths of the Bekhme Formation. The Qamchuqa Formation is primarily residual oil-dominated, with a transition to dry gas observed in its lower intervals. The Sarmord and Chia Gara formations showed a mixture of residual oil and oil phases, with a clear shift to oil dominance in their deeper sections. These findings provide valuable insights into the hydrocarbon potential and phase distributions across the studied formations, contributing to a better understanding of the petroleum system in the region. The present investigation can offer preliminary indications regarding the existence of hydrocarbons. This lowers the possibility of drilling dry Wells and aids in locating possible productive zones.