Abstract:
The 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.
