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Cementation, Mineralogical, Fluid and Textural Influence on Petrophysical and Acoustic Properties of Stø Reservoir Sands
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
We present here results from studies of three Barents Sea wells including 7120/9-1 and 7121/7-1 from the Snøhvit field of the Hammerfest Basin and well 7119/12-1 of the transition zone between the Troms 1 and the Hammerfest Basin. The study focuses on the effects of mineralogy, texture, cementation, clay volume, and fluid content on rock physics and petrophysical parameters of the Stø Formation sandstones. Although sample depths differ, but stratigraphic levels are similar, yet velocity-porosity relationships are quite different especially between the well 7119/12-1 and the other 2 wells. Cementation estimated on log data using cement models show similarities to those observed in point-counted samples. Velocity-porosity trend vary from one basin to another, and from one sandstone type to another. Mineralogy, sorting, amount of quartz cement, grain size, fluid type, clay volume content, burial depth/history all tend to redefine various trends in velocity-porosity, lambdarho-murho, and P-wave velocity/S-wave velocity-P-wave acoustic impedance. Our study gives a better understanding of the complexities of relationships between reservoir parameters in overconsolidated and uplifted sandstones.