Methodology of Compartmentalization Analysis for Modelling - Mereenie Field, Northern Territory

Nguyen, T. T. T. (Australian School of Petroleum, The University of Adelaide) | Nguyen, L. A. T. (Australian School of Petroleum, The University of Adelaide) | Perdomo, G. E. M. (Australian School of Petroleum, The University of Adelaide)

OnePetro 

Abstract

Explored in 1964 and first oil production launched in late 1984, Mereenie oil and gas field is the largest onshore oil field in mainland Australia. Although the production within the Eastern region has been in decline, an appraisal and development drilling project is expected to extend the life of the field. Therefore, a good understanding of dynamic compartmentalization through validation of material balance modeling would address current production planning and monitoring focused in the current oil production formation, Pacoota 3. This study could be the foundation for future development of the western part of the field.

Over 30 years of production and an enhanced oil recovery scheme which involved periodic injection from abundant gas within the upper formation, Pacoota 1; the producing oil formation has yet had any in-depth study of a dynamic compartment within the production time scale. The main objective of this study is to provide an analytical framework for dynamic compartmentalization. This framework was developed to capture the complexity in completions strategy and in the injection period. In total, six compartments across the Eastern Pacoota 3 formation were successfully identified and confirmed through modeling. However, uncertainties in structure and limited data at the West have contributed to production simulation's shortcomings.

It was found that compartmentalization in Mereenie is a combination of variables; those are a natural baffle, fault sealing, injection rate, and drainage radius; while structural faults have a primary role in decreasing the permeability and mobility of oil, causing discontinuity throughout the formation.