KARAKTERISASI RESERVOIR KARBONAT DI LAPANGAN “ENDRETNO”, FORMASI KUJUNG, CEKUNGAN JAWA TIMUR UTARA DENGAN MENGGUNAKAN METODE INVERSI IMPEDANSI AKUSTIK DAN ATRIBUT ISO-FREQUENCY
Islam, Fitrul, Eka Nureahya, Budi
2015 | Skripsi | FMIPA UGMAcoustic impedance inversion method can be used to determine the distribution of lithology and porosity. Seismic attributes is used to look the lateral discontinuity formed by depositional environments and facies of a reservoir. The results of this inversion and attribute analysis are expected to know the distribution of carbonate rocks in Kujung Formation, tto determine the porosity of the formation, and to determine depositional environments and facies of the formation that formed. The data used in this research is 3D post-stack time migration seismic data and well data that has been calibrated with checkshot. Inversion method used is model-based inversion. The results of inversion is acoustic impedance value, while is used to predict the value of porosity. Iso-frequency is attribute that can separate seismic data basic on frequency component, and it used to determine the lateral discontinuity associated with depositional environments and facies of the formation. The results show acoustic impedance values on the target of carbonate reservoirs in the range of 10000 - 40000 (ft/s) (g/cc) with neutron porosity of 4 - 44 %. Analysis of iso-frequency attributes found out that the depositional environment in the research area is carbonate platform of transgressions phase with form of shelf and back-reef carbonate facies. This is supported by the type of gamma ray logs bell shaped.
Kata Kunci : acoustic impendance inversion; iso-frequency attribute; porosity; facies
