Penentuan Tipe Batuan Reservoar Pada Formasi Hutton, Lapangan Jackson, Cekungan Eromanga, Queensland, Northeastern Australia

Abstract

Queensland, Northeastern Australia is known as oil and gas productions spread across several major basins, namely 51% in the Eromanga-Cooper Basin, 46% in the Bowen-Surat Basin, and 3% in the Galilee Basin. This research is focused on the Hutton Formation, Jackson Field, located in the Eromanga Basin. The determination of petrophysical rock type (PRT) and its distribution is carried out with the aim of obtaining an overview of reservoir heterogeneity in the form of Petrophysical Rock Type (PRT) and poro-perm transform equations for each PRT. The data that used are well logs from Jackson 1, 3, and 4) and well report data from Jackson 1 (RCAL). PRT analysis was performed on the core interval using the Hydraulic Flow Unit method then used in other intervals and wells that did not have cores. After all intervals could be defined by their PRT, then the poro-perm transform from the core was applied to obtain a model of vertically well permeability. The results of the analysis show that the study area is composed of three PRTs based on its parameters which are grain size, effective porosity limit values and the main one is the shale volume value. The resulting poro-perm transform is in the form of a three-power regression with the main input being effective porosity. PRT 3 is the best reservoir with a permeability value of >350mD. The vertical and lateral distribution model of permeability shows that reservoir body can consist of several types of PRT, most of that can be correlated.