RESERVOIR CHARACTERIZATION USING EXTENDED ELASTIC IMPEDANCE (EEI) INVERSION METHOD IN ‘YIDA’ FIELD

• Main Author: SURYA UTAMA (NIM: 12313011), AJI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20887
• Institution: Institut Teknologi Bandung

‘YIDA’ field is located in South Sumatera Basin. Talang Akar Formation in this field has potential of hydrocarbon. The late Oligocene lower Talang Akar Formation is also feferred to as the Gritsand Member and the Oligocene to early Miocene upper Talang Akar Formation as the Transition Member. The Talang Akar Formation unconformably overlies the Lahat Formation. This reservoir consists of quartzose sandstone, siltsones, and shales deposited in a delta plain setting that cahnged basinward, into marginal marine sandstones and shales. <br /> <br /> <br /> Reservoir characterization is performed to identify reservoir and its quality using seismic data as its main data. To perform the reservoir characterization, we need to determine which elastic parameter has highest sensitivity to identify lithology and fluid changes, in this case Poisson’s Ratio and Lambda-Rho*Poisson’s Ratio. Those parameters will be spread to seismic data. This will need seismic reflectivity of elastic parameter which we can get from performing Extended Elastic Impedance (EEI) method. From EEI analysis, Poisson’s Ratio has highest correlation with EEI 3160 while Lambda-Rho*Poisson’s Ratio with EEI 3230. Layer of sandstone and sandstone with hydrocarbon can be shown by performing seismic inversion. Model based and linear programming sparse spike inversion are used and optimum result by merging both of the inversions.