RESERVOIR CHARACTERIZATION IN “TDH” FIELD, TALANG AKAR FORMATION, SOUTH SUMATERA BASIN USING EXTENDED ELASTIC IMPEDANCE INVERSION

• Main Author: Indraputra, Alamkelana
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43924
• Institution: Institut Teknologi Bandung

“TDH” field in South Sumatera Basin is a hydrocarbon producer field, and one of them is located at Talang Akar Formation. This formation consists of intercalated sandstone and shale. To further develop the “TDH” field, a research needs to be done to see the location of the good porosity sand laterally across the field. To characterize the good porosity sand, an elastic parameter is needed to distinguish the reservoir and non-reservoir zone. The most sensitive parameter obtained from the well data then used to spread the value of the well through the seismic data using seismic inversion method. Seismic inversion method used in this research is Extended Elastic Impedance inversion, one of the inversion methods that can be used to invert a reflectivity volume, where the reflectivity itself represent an elastic parameter reflectivity. In this research, lambda-rho*poisson’s ratio parameter obtained from the sensitivity analysis is the parameter that will be used as the most sensitive parameter. This parameter can optimally distinguish the good porosity sand zone or the reservoir zone. A value of cutoff is obtained too on this parameter to serve as the boundary value between the reservoir and non-reservoir layer. A reflectivity cube that represent the lambda-rho*poisson’s ratio parameters then made using the EEI method that contain two stages, which is finding the best EEI angle and two term AVO analysis Ursenbach-Stewart to obtain the Rp and Rs volume. This reflectivity volume then inverted using the model-based inversion and sparsespike inversion which then the frequency is merged using the frequency domain merge. The result of the frequency merge is the one that can be trusted, because it contained the information from the seismic-based and well-based inversion. The result then sliced using sand-to-gross ratio slice to see the lateral distribution of the reservoir zone that was found. From the slicing result, there is a new area of interest in the north-west of BEL-039 well which have a thick reservoir layer and on a high area