PEMETAAN BAWAH PERMUKAAN DAN ANALISIS PERSEBARAN RESERVOIR PADA FORMASI TALANGAKAR AREA LAPANGAN RARASWARI CEKUNGAN JAWA BARAT UTARA. STUDI KASUS : BATUPASIR TAF-3 OLIGOSEN AKHIR

Abstract

Oil and gas industry in Indonesia still plays an important role in supporting the country's development program. Therefore, it is still necessary oil and gas production continuously. Special studies that will provide more detail kostribution in the development of an oil and gas field. Research areas of oil field development studies lies in the reservoir silisiklastik sediment, Talangakar Formation, North West Java Basin. Purpose of this research, among others, identify formations characteristics, identify depositional environment, facies, and petroleum system of Raraswari field, identify conditions and distribution of reservoir based on log corelation and subsurface map, know the value of the potential reserves and give location of new development well at Raraswari field. The method that is used in this research are descriptive and analysis method. Researcher did log analysis, seismic analysis, and subsurface map analysis. Software that is used to support this research are Geoframe, Geolog, Seisearth XV, and Geodepth. Based on log analysis, lithology which being reservoir is sandstone TAF-3 Late Oligocene and has shale volume 23%, porosity 11.9%, and water saturation 26%. Based on elektrofacies analysis, sandstone TAF-3 identified as distributary channel facies and deposited in the delta plain environment. Based on subsurface map analysis, sandstone TAF-3 deposited in lower surface, in the midle to northwest area of Raraswari Field. Generation occurs in the Talangakar Formation. Source rock are shale with organic rich and coal streak. Hidrocarbon’s migration has lateral direction from north to the south and trapped by structural and stratigraphy trap. Structural trap formed by normal fault and seal rock lithology is shale. Based on volumetric calculation, potential reserves is known for 2,272,935.983 STB and location of development well on the coordinates x = 107 ° 56 'xx.xx "E, y = 6 ° 17' xx.xx" in depth 2800 m to 2820 m. Keywords : silisiklastik sediment, subsurface map, development well