Seismic characterization analyses of the Bulgarian Black Sea shelf for assessment of reservoir properties

In the Bulgarian Black Sea shelf, several gas fields have been discovered in Maastrichtian–Paleocene sediments to date. this study, amplitude versus offset analysis (AVO) was carried out, and extended elastic impedance (EEI) also used, predict fluid lithology properties. Thus, these special cases, AVO (or reflection angle) can significantly de-risk existing Paleocene prospects allow focus on Miocene–Oligocene successions, where some identified. By examining variations angle offset), it is possible unravel effects top of a reservoir. Seismic modeling used determine what type seismic response, terms AVO, expect at depth interest study area. There are five classes or types responses, area 1 2 were defined prospects. Brine-filled reservoirs conglomerates exhibit class whereas gas-filled show responses. EEI has ability give estimates for parameters, such as Vp/Vs ratio, bulk modulus, shear Poisson’s ratio other parameters. current simultaneous inversion testing done and, analyzing all wells together, most promising indicator, showing good separation between water although there overlap. Projection an 38° through brine points gives useful brine, 10% 90% reservoirs. However, resulting projection still low, which may make difficult resolve variation once noise added.