Geochemical Investigation and Effect of Sedimentary Environment Changes on Pabdeh Formation Hydrocarbon Potentiality in Mansuri Oilfield
Subject Areas :بهرام علیزاده 1 , ندا جنت مکان 2 , هرمز قلاوند 3 , محمد حسین حیدری فرد 4
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Keywords: hydrocarbon potential Pabdeh Formation Sedimentary environment Thermal History Modeling , Mansuri Oilfield ,
Abstract :
Pabdeh Formation is one of the most important probable source rocks in Mansuri oifield being under investigation . In this study, hydrocarbon potential of pabdeh formation is evaluated. Also effect of sedimentary environment changes on geochemical and hydrocarbon potential variation is studied ,To achieve this , hydrocarbon potential of Pabdeh Formation with Rock Eval Pyrolysis was investigated .Besides that, gas chromatography and gas chromatography-mass spectrometry data were utilized . Based on this study , in the Late Eocene age , relative sea level had raised , while in the Oligocene age, falling in sea level was occurred .Variation in sea level caused Pabdeh Formation to be heterogeneous in hydro carbon potential . Pabdeh Formation in Mansuri oilfield from geochemical aspects is divided into three divisions. Lower ad Upper zones I this formation, have fair (0.5-1%TOC) to good (1-2%TOC0 hydrocarbon potential and contain Kerogen type III. These zones have gas production potential . Middel zone, has very good (2-4%TOC) to excellent (TOC>4%) potential and contains Kerogen type II and III.Middel zone has oil production potential . Rock Eval data as well as thermal history modeling demonstrate that; Pabdeh Formaion is in early oil window, started yielding petroleum since 5-6 million years
