Integrated reservoir characterization and fluid flow distribution of the Kaimiro Formation, Taranaki Basin, New Zealand
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ORIGINAL PAPER-EXPLORATION GEOLOGY
Integrated reservoir characterization and fluid flow distribution of the Kaimiro Formation, Taranaki Basin, New Zealand Mohamed Ragab Shalaby1,2 · Syamimi Hana Binti Sapri1 · Md Aminul Islam1 Received: 25 July 2020 / Accepted: 11 September 2020 / Published online: 22 September 2020 © The Author(s) 2020
Abstract An integrated reservoir characterization study is achieved on the Early to Middle Miocene Kaimiro Formation in the Taranaki Basin, New Zealand, to identify the quality of the formation as a potential reservoir. The Kaimiro Formation is a section of the Kapuni Group in the Taranaki Basin, consisting mainly of sandstone and a range of coastal plain through shallow marine facies. Several methods were accomplished for this study: petrophysical evaluation, sedimentological and petrographical descriptions and well log analysis. Based on the petrophysical study, the Kaimiro Formation is interpreted to have several flow units ranges up to 15 μm. Higher RQI and FZI reflect potential reservoir, while the pore size and pore throat diameters (r35) are found to be within the range of macro- and megapores, on the contrary to macropores related to poor reservoir quality concentrated in Tui-1 well. This is in good agreement with other measurements that show the formation is exhibited to be a good promising reservoir as the formation comprises a good average porosity of 19.6% and a good average permeability of 879.45 mD. The sedimentological and petrographical studies display that several diagenetic features have been affecting the formation such as compaction, cementation, dissolution and the presence of authigenic clay minerals. Although these features commonly occur, the impact on the reservoir properties and quality is minor as primary and secondary pores are still observed within the Kaimiro sandstone. Moreover, well log analysis is also completed to further ensure the hydrocarbon potential of the formation through a qualitative and quantitative analysis. It has been confirmed that the Kaimiro Formation is a promising reservoir containing several flow units with higher possibility for storage capacity. Keywords Kaimiro formation · Petrophysics · Petrography · Diagenetic features · Well logging · Reservoir quality
Introduction The Taranaki Basin is the largest sedimentary basin in New Zealand, and it is situated on the North Island in the west coast of the country (Fig. 1) (Palmer 1985). The Taranaki Basin has a high quantity of commercial oil and gas reserves in New Zealand, covering an area of 100,000 k m2 (King and Thrasher 1996). Furthermore, the reservoirs of this basin have been generating from the Paleocene to Pliocene ages, with the main petroleum reserves mostly found along the Paleocene shoreline with a broad northeast to southwest trending fairway and within the coastal plain Paleocene * Mohamed Ragab Shalaby [email protected] 1
Department of Geosciences, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Brunei Darussalam
Geology Department, Fa
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