The Using of Vp/Vs Ratio and P-Impedance for Differentiate Both Fluid Sand Lithology Depending on Rock Physics Templates Model of Mishrif and Nahr Umr Formations in Kumait and Dujaila Oil Fields Sothern Iraq

Abstract

This study attempt to explore the local rock physics modeling to reach the best solve in case of  some difficulties  such as  missing some logs in reservoir prospects. This research applied to three wells Kt-1, Kt-2 and Du-2. Some Petro-physical properties measured from the logs and others by using a particular equations and empirical such as the shear wave velocity which is extract from the P-wave velocity. The rock physics application using relation cross-plots between  acoustic impedance versus Vs/Vs ratio were match the result of therock physics templates model to separate the lithological units of sand and shale in the wells and carbonate rock in the reservoirs of interest with the aid of the relevant rock physics models. The acoustic impedance (AI) versus Vp /Vs ratio cross-plots indicate the type of fluid from the log and identified shale, sand bodies and oil or water bearings carbonate rockzones in Mishrif and NahrUmr Formations in Kumait and Dujaila oil fields, southern Iraq. The study represent a successful attempt to obtain the lithological and fluid types depending on rock physics templets model instead of the interpretations of  logs of the reservoir.