Syafi’i, Muhammad2021-07-282021-07-282020-08wahyu sari yenihttps://repository.unri.ac.id/handle/123456789/10038The biomarker is a chemical indicator of organic material sources that can be used as an indicator of the depositional enviroment, correlation of oil and the origin of oil sources. Bakau and Beruk Oil is one of the newly discovered oil fields located in the Selat Panjang Block, Riau. Petroleum samples from Bakau and Beruk were fractionated using the chromatography column into an aromat fraction. Analysis of aromat fraction using chromatogafi gas-mass spectroscopy (GC-MS) m/z 191. This study aims to determine the level of maturity, the depositional environment and the correlation of petroleum using biomarker parameters (tricyclic C25/C26, tricyclic/hopana and bisnorhopana). The results showed the Pr/Ph value of Bakau petroleum 1.20 and Beruk 1.57; Pr/n-C17 Bakau 0,73 and Beruk 0,4, Ph/n-C18 Bakau 0.13 and Beruk 0.19, trisklik/hopana value of petroleum Beruk and Bakau are 1.069 and 0.156. The tricyclic parameter C25/C26 each value is Beruk 0,878 and Bakau 1,289. The tricyclic/hopana value shows that Beruk oil is more mature than Bakau, while Tricyclic parameter C25/C26 shows that Beruk oil comes from lakes, while Bakau oil from the mainland. Pr/Ph values indicate an oxidative depositional environment. The bisnorhopana parameter shows that Beruk petroleum is derived from organic chemoautotrophic bacteria while Bakau is not derived from chemoautotrophic bacteria. The uncorrelated Bakau and beruk petroleum shown by the star diagram.enAromat FractionBeruk oil, Bakau oilBiomarkersgas chromatographymass spectroscopy (GC-MS)gas chromatographymass spectroscopy (GC-MS)Article