ANALISIS POTENSI RESERVOIR HIDROKARBON BERDASARKAN DATA LOG DAN DATA SEISMIK LAPANGAN KELANA, FORMASI CIBULAKAN ATAS, CEKUNGAN JAWA BARAT UTARA

Abstract

Under surface mapping used method recording under surface geology information,then recording report be processed and analysed so can resulted description about geometry, distributed, depth of reservoir to estimated hydrocarbon reserve of hydrocarbon can be produced. Stratigraphy KELANA field from old to youth such as Jatibarang Formation, Talang Akar Formation, Baturaja Formation, Cibulakan Atas Formation, Parigi Formation and Cisubuh Formation. Reservoir layer object this research is “N” layer that have litology shaped clastic limestone, inside Cibulakan Atas Formation. Research purpose can used know litology layer N refer to from GR log, resistivity log, porosity log that is density (RHOB) log and neutron (NPHI) log with indication fluid; to determaine porosity value in each ABA well, KELANA field; and know prospect reserve reservoir hydrocarbon potential with standard value based on GOR (Gas Oil Ratio) from litology clastic limestone layer N ABA well, KELANA field. Method used qualitative method to be with reading directly in log type. The reading log type talked about include GR log, resistivitas and porosity, beside that analysis facies, preparation model stratigraphy sequence, correlation, seismic interpretation, preparation subsurface map. Quantitative method to be with petrofisica analysis is calculation hydrocarbon reseve, Sxo, Sw and Shr. Prospect hydrocarbon potential good with standard value based on GOR (Gas Oil Ratio) in Pertamina EP Region Jawa (1996) is gas revolve 2,16 x 107 – 8,66 x 107 Scf (Standar Cubic Feet). Based on production data to be able kind gas well with oil light in weight condenser. Facies deposit Cibulakan Atas Formation is delta front – prodelta with litology composition shaped of shale terraced sand and clastic limestone. Found a normal fault at East side of research wells, with South West – North East. Bulk volume in N1 layer 2.263,58 acre. Ft, bulk volume N’ layer is 1573,61 acre.ft and bulk volume N layer is 4572,57 acre.ft. Hydrocarbon reservoir estimate N1 layer shape of gas between 2,83 x 107 Scf, N’ layer 2,72 x 107 Scf and N layer 5,71 x 107 Scf