MAKALAH ILMIAH - Pusat Sumber Daya Geologi

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MAKALAH ILMIAHFigure 3 – Tectonic scheme of the Mangkalihat in Cretaceous – Paleogen (Satyana, 2003)Figure 4 – Regional Geological map and stratigraphical colum of research area,(Blue block shows interval of study) (Djamal et al., 1995)81 Buletin Sumber Daya Geologi Volume 7 Nomor 2 - 2012
MAKALAH ILMIAH ILMIAHFigure 5 – Play mechanism intersection from regional petroleum system in research area.with molusca. The focus of stratigraphicalsegment in this study is in Tendehantu andTabalar Formations.PETROLEUM SYSTEMThe petroleum system analogue wasadopted from comparison with the playmechanism in East Kalimantan (Figure 5 ).The potential source rock is from Paleocene– Eocene segment, consists of deltaic coaland lacustrine of Kutai Basin. The turbiditesandstone and shallow marine deposit alsoplay as reservoir potential in Southern KutaiBasin, that were developed during Eocene –Oligocene. In this study, the Oligocene –Miocene sediments that play as the maintarget reservoirs are the Tendehantu andTabalar Formation. The analogue of trappingmechanism in the research area is thepresent marine segment such as GolokFormation (Figure 4). The migrationmechanism can be interpreted by crosssection (Figure 5) of an inverted regimeduring Miocene. This analogue can bereflected in the study area as whenSangkulirang and Maratua Faults wereactive and developed during Miocene andprobably to Recent. The migrationmechanism can openly transport the maturehydrocarbon to be trapped in the Eocene –Miocene Reservoir in this study area.CARBONATE FACIES ANALYSISCarbonate facies analysis wasinterpreted based on lithology, texture,composition and fossil content, thatobserved in field description. Based on thatexamination Tabalar and TendehantuFormation were divided into 3 lithofacieses.Further analysis, especially for microfaciesdetermination, was interpreted based on thinsection texture, composition, fossil contentand diagenetic feature.Tabalar Formation has one lithofaciesthat can be determined as packestone –wackestone lithofacies (Table 1). Thislithofacies is dispersed in the western part ofresearch area (Figure 6), and spreads fromNorth to South trend. The lithofacies hascharacters of massive body with no beddingfeature, white colour, and poor – mediumsorted fragment consists of branching andplaty coraline as well as containing bivalveshells. The porosity that can be observed ismoldic and vuggy as the product of intensedissolution (Figure 11). Petrographicalanalysis showed that it is generally poorlysorted with grain from 0.2 – 4 mm range,medium abrated with float and point contact.The dominant fragments are bryozoan,larger forams and coraline fragment.Based on dominant fragment marker, onpetrographical analysis, this lithofacies canbe divided into 2 microfacies clusters namelythe Larger Forams – Coraline WackestoneBuletin Sumber Daya Geologi Volume 7 Nomor 2 - 201282
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Page 14: MAKALAH ILMIAHREFERENCESDjamal, B.,

MAKALAH ILMIAH - Pusat Sumber Daya Geologi

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