Putri, M. N.Tamboesai, E. M.Awaluddin, A.2013-07-022013-07-022013-07-02Rangga Dwijunanda Putrahttp://repository.unri.ac.id:80/handle/123456789/4049The crude oil sample of Duri oil well (OSD-1) was determined based on the content of aliphatic and aromatic hydrocarbons. The content of aliphatic hydrocarbons were characterized by gas chromatography (GC) whereas that of aromatic hydrocarbons were measured by gas chromatography-mass spectrometry (GC-MS). In the present work, various geochemical parameters have been used to confirm organic matter source, the waxiness, depositional environment and thermal maturity value. Based on abundance of aliphatic hydrocarbons, the studied oil sample of Duri oil well (OSD-1) was formed from a mixed organic source with more contribution from higher vascular plants (terrestrial). The result also indicated that the oil sample of Duri oil well (OSD-1) has high waxy value and originated from delta marine (aquatic-lacustrine) deposited under oxidizing environment. The level of maturity of Duri crude oil was characterized by maturity parameters, such as methylphenanthrene index (MPI), methylphenanthrene ratio and vitrinite reflectance equivalence (VRE). The values of above parameters are as follows; 3 for 0.85 for methylphenanthrene index 3 (MPI 3), 1.14 for methyl phenanthrene ratio (MPR) and 0,81% for vitrinite reflectance equivalent (VRE) respectively. The values showed that the studied oil sample of Duri oil well (OSD-1) is at mid maturity level.otherDuri crude oilmetilphenantrene indexthermal maturityOther