ArticleScientific reports2025
An integrated petrophysical and rock physics characterization of the Mangahewa Formation in the Pohokura field, Taranaki Basin.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The Mangahewa Formation in the Pohokura gas field, Taranaki Basin, is a key reservoir for gas production in New Zealand, yet its deep and heterogeneous nature presents challenges for accurate reservoir characterization. While prior studies have explored aspects of the Mangahewa Formation such as lithology, fluid composition, and petrophysical properties, the interrelationships between these factors and their impact on hydrocarbon production remain underexamined. This study integrates detailed petrophysical and rock physics analyses to overcome these challenges. Petrophysical evaluation, based on well log data from depths of 3200-4000 m, reveals net reservoir thicknesses ranging from 164 to 479 m, with total porosity between 17 and 21% and effective porosity between 8 and 19%. Shale volume and water saturation vary from 21-28 and 22-34%, respectively. Rock physics analysis was performed using Rock Physics Templates (RPTs) to model the elastic properties of the reservoir. The Mangahewa Sandstone exhibits elastic properties consistent with the stiff sand model, with compressional sonic velocities ranging from 4100 to 5000 m/s. High correlations were achieved between measured and modeled velocities, with 97% for V
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