Alternatif Metode Penentuan Karakteristik Litofasies Berdasarkan Gabungan Data Wireline Log Pada Reservoir LRLC Formasi Upper Sihapas, Lapangan ARS, Cekungan Sumatra Tengah

Abstrak

Lithofacies analysis is one of the initial studies in oil and gas exploration to determine the type and quality of a reservoir. Various lithofacies analysis methods have been developed to increase confidence in the analysis results. One method that can be developed is cluster analysis based on multiple wireline log data. This cluster analysis has the advantage of knowing the type of lithofacies in intervals that do not have core rock data. The results of the lithofacies analysis of the core rocks show the presence of four lithofacies, namely shale inserted with clayey sandstone (A), clayey sandstone inserted with shale (B), clayey sandstone and shale (C), and shale (D). This study uses gamma ray log, density log, and neutron log data in cluster analysis to show the physical characteristics of a rock. The three log data cluster analysis produced a lithofacies log curve consisting of four data groups. The lithofacies log curves resulting from the cluster analysis show agreement with the three core rock lithofacies: A, B, and C. The difference in lithofacies D between the cluster analysis and the core rock is due to geometry and the level of detail of the number of data groups in the cluster analysis.