Abstract
A reservoir characterization study, using petrophysical and petrographic analyses, has been made on the Paleocene Farewell Formation in the Taranaki Basin, New Zealand, based on five selected wells. Farewell Formation is largely a sandstone formation belonging to the Kapuni Group. The integrated study has shown that Farewell Formation is a good promising reservoir with average effective porosity of 17.7% and permeability of 415 mD. The petrographic study indicates the occurrence of abundant intergranular and secondary pores. It also proved that the Farewell Formation has been affected by several diagenetic features. Compaction, cementation and clay mineral authigenesis are the most common. Quartz and feldspar overgrowths have been recorded in many samples, and secondary porosity due to dissolution is also observed. In general, good reservoir quality features are dominant in the Farewell Formation and diagenesis has little effect on the reservoir quality. These findings are supported by well log interpretation results, which confirm good sand and net pay zones are available with very low average water saturation (24.9%).
Highlights
The objective of this research is to study the reservoir quality of Farewell Formation of Taranaki Basin, New Zealand
Based on the three components utilized in this reservoir characterization study of the Farewell Formation, it can be concluded that the Farewell Formation has good reservoir quality
The integrated study strongly supports the known role of the Farewell Formation as a proven reservoir in the petroleum system in Taranaki Basin
Summary
The objective of this research is to study the reservoir quality of Farewell Formation of Taranaki Basin, New Zealand. This is carried out through a comprehensive investigation on the reservoir aspect of the Farewell Formation, via an integrated approach of petrographic and sedimentological study, as well as petrophysical aspects, which include well log interpretation. The Farewell Formation is deposited as a transgressive sequence, as a result of the regional post-rift subsidence at the end of the Upper Cretaceous. It is distributed widespread across the basin except over larger basement highs (Ministry of Business, Innovation and Employment, New Zealand 2014).
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