ANALYSIS OF THE DISTRIBUTION OF HYDROCARBON AND ECONOMIC RESERVOIRS FOR PRODUCTION IN THE LATE MIOCENE DL4A – DL3A SEQUENCES IN SADEWA FIELD, KUTAI BASIN USING INTEGRATION OF SEISMIC ATTRIBUTE, SEISMIC INVERSION AND SEISMIC STRATIGRAPHY METHODS

• Main Author: Jerico Simanjuntak, Hendri
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61745
• Institution: Institut Teknologi Bandung

Kutai Basin is a basin that has the second-largest hydrocarbon reserves in Indonesia. Where, this research is focused on one of the locations in the basin, namely Sadewa Field. Where there is a thin sandstone reservoir in the stratigraphic trap that is difficult to identify in Late Miocene. Thus, the purpose of this study was to identify the facies of the depositional environment, lateral distribution, and distribution of sandstone reservoir economic pay in the DL4A – DL3A sequence in the Late Miocene age. This study uses 3D PSTM seismic data and seven well data. Where, the determination of target zones and sequence boundaries is carried out based on log data, seismic data, petrophysical data, and biostratigraphic reports. Then, the lithology was separated using a cross plot from the log data. Integration of methods such as seismic attribute, seismic inversion, and seismic stratigraphy is carried out to identify the target zone further. Simple calculations are carried out to determine the thickness of the economic pay from the log data based on the specified parameters and the correlation between attributes to find the best relationship to economic pay. Based on the analysis, there are four main sandstone reservoirs, namely 1010, 1030, and 1050 and 1090 U located in the DL4A – DL3A sequence boundary interval in the bathyal zone. The 1010 and 1030 sandstone reservoirs are deposited on the slope fan and channel geometry in the form of turbidite deposits. Then, the 1050 and 1090 U sandstone reservoirs were deposited in the channel geometry as well as turbidite deposits. All sandstone reservoirs were deposited at lowstand (LST) whose thickness was controlled by deposition on the basin floor. Hydrocarbon fluid distribution and depositional geometry can be identified by seismic attributes. The results of seismic inversion with model-based technique can show the characteristics of the physical properties of the reservoir. And, the distribution of economic pay that has been identified is in the form of turbidite deposits that fill the channel geometry in 1010, 1030, 1050, and 1090 U sandstone reservoirs using the RMS amplitude*1/Variance attribute.