Depositional and diagenetic controls on anomalously high porosity within a deeply buried CO₂ storage reservoir—The Cambrian Mt. Simon Sandstone, Illinois Basin, USA

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• 作者：Jared T. Freiburg^a ; ^b ; ^{freiburg@illinois.edu} ; Robert W. Ritzi^c ; Kelsey S. Kehoe^a
• 关键词：CO2 geo-sequestration ; Anomalous porosity ; Diagenesis ; Compaction ; Cementation ; Illite clay coatings ; Cambrian Mt. Simon Sandstone
• 刊名：International Journal of Greenhouse Gas Control
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：55
• 期：Complete
• 页码：42-54
• 全文大小：4669 K
• 卷排序：55

文摘

Compaction porosity loss in the Mt. Simon Sandstone and underlying Argenta is normal in the sense that compaction generally increases with depth. Cementation porosity loss in the Mt. Simon is highest in the Middle and Upper Mt. Simon occluding primary porosity. Anomalous porosity in the Lower Mt. Simon is controlled by early clay coatings over detrital grains that inhibit authigenic quartz cements. Late post-compaction dissolution of feldspar in the Lower Mt. Simon increased porosity in the form of secondary moldic porosity. It is hypothesized that the Lower Mt. Simon and underlying Argenta were deposited in a rift style basin as opposed to a sag basin.