KORELASI MINYAK BUMI BLOK BANGKO–ROKAN HILIR DENGAN MINYAK BUMI DURI-BENGKALIS, RIAU MENGGUNAKAN PARAMETER GEOKIMIA MOLEKULER

Abstract

Crude oil is the main energy resources for industry, transportation and house hold needs. The demand for crude oil in Indonesia is much higher than its production which leads to current energy crisis. One of solutions for this crisis is to conduct correlation study, which determines the genetic relationship at each oil well. The correlation study of crude oil between in Bangko Rokan Hilir with Duri Bengkalis has not been conducted previously. This study could assist to provide the indication of the genetic relationship, deposition zone, souce rock and the origins of Bangko and Duri’s crude oil. The crude oil samples taken immediately from oil wells was first refrigerated before conducting geochemistry analysis. The samples were then fractionated by column to separate saturated fraction. This fraction was analyzed using Gas Chromatography (GC). On the basis of the abudance of hydrocarbon aliphatic, the crude oils samples have small ratio value, which is 0,38-0,50 for Pr/n-C17 and 0,16-0,18 Ph/n-C18. This values indicated that the samples were originated from higher vascular plants (terrestrial). The samples derived from lacustrine environments (lake) have ratio value of Pr/Ph (2,50-2,90). The calculation from Star diagram have showed that the samples of production oil field in Bangko (MB-07, MB-026 and MB-172) are positively correlated, but the samples of production oil field in Bangko MB-07 with MB-026 is closer correlation than the MB-172, whereas the oil samples in area MB-07, MB-026 dan MB-172 of Bangko with the oil sample in Duri (MD-01) are negatively correlated. The positive correlation indicated that the samples have the genetic relationship at each oil, a same source matter.