APPLICATION OF ACOUSTIC IMPEDANCE INVERSION AND MULTIATTRIBUTE TO RESERVOIRS IN FIELD X OF SOUTH SUMATRA BASIN TO ESTIMATE POROSITY IN RESERVOIR ROCKS

Abstract

One of the resources that is in high demand is natural gas and oil. The demand for these resources continues to increase every year, but their availability is decreasing. Currently, domestic demand for oil and gas has increased due to economic growth. However, oil and gas production has decreased. This depletion of oil and gas production makes it a challenge to increase oil and gas exploration using certain methods. Therefore, it is necessary to increase exploration activities and maximize existing reserves, one of which is in the South Sumatra basin. This research was motivated by the lack of understanding of the distribution of reservoirs in the Gumai Formation. The characteristics of reservoirs in this formation are still limited. 3D post-stack seismic data and 3 well data were used in this study. The objective of this study is to obtain an estimate of the acoustic impedance value in the reservoir area in the top A – bottom A layer in the South Sumatra Basin of the Gumai Formation. This will help us to predict the distribution of porosity and identify the next prospect zone by performing acoustic impedance inversion techniques and multiattributes. Furthermore, to strengthen these results, petrophysical and crossplot analysis was carried out to obtain the properties of each formation in the log data. The reservoir is in the Gumai Formation and has a porosity between 8% and 17% based on the results of inversion and multiattribute analysis. The distribution of reservoirs in field X has a southeast-oriented continuity