Talang Akar Formation is a proven hydrocarbon source rock in South Sumatra\nbasin. The formation contains dominant shale at the top, with some sandstone\ninterbeds. Whereas it contains coarse to very coarse sandstone beds at\nthe bottom. The lower sandstone unit also contains carbonaceous shale and\nsome coal seams. The geochemical analysis is important to identify a source\nrock quality in shale gas. The quality of source rock is determined by richness\nof the source rock and type of kerogen. 37 samples were collected from well\ncuttings in JML-1 and JML-2 wells. Samples we are received into the laboratories\nin the form of well site canned ditch cuttings, bagged ditch cuttings in\nvarious stages of preparation from wet, unwashed to dried, washed; sidewall\ncores, conventional cores, outcrop samples. The richness of a source rock can\nbe defined by the content of organic carbon which is measured as total organic\ncarbon (TOC). Based on geochemical result of analysis, quantity of\nshale hydrocarbon potential is indicated by the TOC value of 0.52 wt% - 6.12\nwt% (fair to excellent criteria), with average of shale thickness more than 50\nm. Tmax is an indication of the maturation stage of organic material and\nHydrogen Index (HI) is a parameter used to explain the origin of organic\nmaterial. HI versus Tmax crossplot was analysed for kerogen type determination\nand presence of type II/III kerogen was identified. This study concludes\nthat the source rock contains abundant humic organic matter that was deposited\nin a transitional (Fluvio-deltaic) to marginal marine environment under\noxic conditions.
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