Publications

The Research area was located in Kapur IX district, West Sumatera which divided to three observed areas such as Kototuo, Kotobangun, and Galugur areas. This study aims to evaluate shale and claystone in Galugur Unit as potential source rock by using detailed Total Organic Carbon (TOC), Rock-Eval Pyrolisis, and petrography analysis (maceral identification) from 6 samples of the Galugur Unit. Galugur Unit are characterized by conglomerate, quartz sandstone, claystone, coal, sandstone with fine until coarse grain size, shale, and siltstone. This unit is distributed from the northern until the southern of Kapur IX Intramountain Basin. Then, this unit was deposited in Middle Eocene to Late Eocene. However, oil shale and claystone of Galugur Unit was deposited in Lacustrine depositional environment with high saline level based on petrography analysis which dominated by alginite (lamalginite) and framboidal pyrite. Geochemically, Galugur Unit in Kapur IX areas are characterized by the richness (TOC vs. HI) that predominantly tends to be in the oil area with a very good to excellent TOC value condition. Then, from kerogen type (Tmax vs. HI) are dominated by Type 2. Based on comparison between TOC and PY, the kerogen in the research areas are dominated by oil-prone with ranging from good to very good. Moreover, the quality (TOC vs. S2) of the oil shale is very good to excellent. The maturity level shows that the oil shale has an immature level, which is good for oil shale as a source rock. Then from the orign of the source rock, all samples of the study area are autochtonous (indigenous hydrocarbon). The results of this study suggest that Galugur Unit in Kapur IX Intramountain Basin has a good potential as a source rock and tend to be implicated as unconventional hydrocarbon.