Abstract
Research on the Late Miocene of Pandua Formation shale in Andowia area, Southeast Sulawesi is fundamental because it is considered to have the potential as a source rock in Manui Basin. This study aimed to determine the lithofacies and its potential as petroleum source rock using megascopic, petrographic, and total organic carbon analyses in Pandua Formation shale. Based on the megascopic and petrographic analysis of outcrops, the shale can be subdivided into 11 lithofacies consists of clayey shale, massive claystone, clastic detritus-rich claystone, massive mudstone, mica-rich mudstone, iron oxide-rich mudstone, low-angle laminated mudstone, massive siltstone, carbon-rich massive siltstone, laminated siltstone, and carbon-rich laminated siltstone. The results of the analysis of 19 samples of shale showed that the total organic carbon (TOC) content was classified as poor to excellent (<0.5%- >4%). The lithofacies with a high concentration of TOC are carbon-rich massive siltstone and carbon-rich laminated siltstone. Both lithofacies were categorized as potentially excellent source rock which the TOC value content is 5.78% and 5.74%.The result implies the better understanding of the depositional environment and hydrocarbon accumulation potential of the Manui basin for future exploration.
Highlights
Oil and gas are an energy resource that plays a significantrole in supporting the country’s economy
This paper aims to determine the shale lithofacies and their potential as petroleum source rock
The sample from outcrop was taken for laboratory analysis, which are microscopic and total organic carbon (TOC) content analysis
Summary
Oil and gas are an energy resource that plays a significantrole in supporting the country’s economy. Manui Basin has an active petroleum system and the possibility of hydrocarbon accumulation[2]. This is supported by the discovery of oil and gas seepage near the coast of this area. The discovery of oilseepage in the Lasolo area and gas seepage in the Wawolesea area, North Konawe Regency (Figure 1) proves that this area has an effective source rock. This shows that it can form and expel hydrocarbons (oil and natural gas). This is supported by sample geochemical data from the Abuki- 1 well, which shows a high TOC value at intervals equivalent to the Middle-Late Miocene age of 1.64%- 3.74% [2]
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