Geochemical characteristics and oil–oil correlation of the upper Cretaceous oils from the Iranian part of the Persian Gulf Basin

Abstract The Cenomanian Sarvak oil reservoirs are distributed over large areas of the Persian Gulf basin. purpose this study is analyzing geochemical characteristics and their inter-relationships in Gulf, classification samples investigation possible causes genetic difference families. In previous studies, limited reservoir scarce oilfields were studied individually local interpretations made accordingly. current employs a more complete set from Iranian part regional drawn. To achieve goal, data 41 10 collected assessed based on gas chromatography (GC), chromatography–mass spectrometry (GC–MS), stable carbon isotope analysis. It was demonstrated with evaluations that oils accumulated Upper Cretaceous basin originate different source rocks. genetically classified into four families similarities differences parameters related to depositional environment-dependent using hierarchical cluster analysis (HCA), star diagram, diagram. rocks mainly deposited anoxic marine carbonate environments. thermal maturity evaluated steranes trisnorhopanes. Oil 2 4 (located at center Gulf) have highest compared other samples; contrast, family 1 west has lowest maturity. 3 eastern C 28 /C 29 upper successions; Triassic Lower Jurassic formations. Results show high similarity between 4, which located Gulf; these results also recognize significant two 3. issue raised find out reason for difference. structural central shows huge vertical faults created by salt domes intrusion provided migration pathways trapping reservoirs. Surmeh, Fahliyan, Dariyan migrated upwards through be trapped Formation across Gulf.