STUDI POTENSI BATUAN INDUK HIDROKARBON SATUAN BATULEMPUNG FORMASI RAMBATAN DAERAH WANGON SUB-CEKUNGAN BANYUMAS

ABSTRACT – Identification of rock intervals that may have as a source rock potential is the important first step inhydrocarbon exploration, therefore it is necessary to conduct research on the sedimentary rock containing organicmatter which with a certain level of heat and time can produce hydrocarbons in the form of oil or gas. The objective ofthis study is to identify lithofacies and hydrocarbon source rock potential of Claystone Unit of the Rambatan Formationin the Wangon Area, Banyumas Sub-Basin. Based on outcrop data showed that Rambatan Formation in the study areapredominantly composed of shale with thin intercalation of sandstones. This formation was deposited in the deepmarine environment by turbidity current. Geochemical analysis in order to determine the potential and quality of sourcerock was performed on four samples (BMS-28, KLP-27, KLP-31 and BMS-120) of Rambatan shale. The analysis ofpotential and source rock quality showed TOC content varied from 1.21% - 23.45% indicating “very good” quality.Rock-Eval analisys show that the shale from sample BMS-28 and BMS-120 are poor as hydrocarbon source rock(S25 kg / ton). All samples taken from Rambatan shale showed Ro <0.6 indicate hydrocarbon maturation level has notbeen reached. The low values HI of BMS-28 and BMS-120 (HI