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How important is carbonate dissolution in buried sandstones: evidences from petrography, porosity, experiments, and geochemical calculations

Yuan, Guang-Hui; Cao, Ying-Chang; Gluyas, Jon; Wang, Yan-Zhong; Liu, Ke-Yu; Xi, Ke-Lai; Yang, Tian; Wang, Jian

How important is carbonate dissolution in buried sandstones: evidences from petrography, porosity, experiments, and geochemical calculations Thumbnail


Authors

Guang-Hui Yuan

Ying-Chang Cao

Yan-Zhong Wang

Ke-Yu Liu

Ke-Lai Xi

Tian Yang

Jian Wang



Abstract

Burial dissolution of feldspar and carbonate minerals has been proposed to generate large volumes of secondary pores in subsurface reservoirs. Secondary porosity due to feldspar dissolution is ubiquitous in buried sandstones; however, extensive burial dissolution of carbonate minerals in subsurface sandstones is still debatable. In this paper, we first present four types of typical selective dissolution assemblages of feldspars and carbonate minerals developed in different sandstones. Under the constraints of porosity data, water–rock experiments, geochemical calculations of aggressive fluids, diagenetic mass transfer, and a review of publications on mineral dissolution in sandstone reservoirs, we argue that the hypothesis for the creation of significant volumes of secondary porosity by mesodiagenetic carbonate dissolution in subsurface sandstones is in conflict with the limited volume of aggressive fluids in rocks. In addition, no transfer mechanism supports removal of the dissolution products due to the small water volume in the subsurface reservoirs and the low mass concentration gradients in the pore water. Convincing petrographic evidence supports the view that the extensive dissolution of carbonate cements in sandstone rocks is usually associated with a high flux of deep hot fluids provided via fault systems or with meteoric freshwater during the eodiagenesis and telodiagenesis stages. The presumption of extensive mesogenetic dissolution of carbonate cements producing a significant net increase in secondary porosity should be used with careful consideration of the geological background in prediction of sandstone quality.

Citation

Yuan, G., Cao, Y., Gluyas, J., Wang, Y., Liu, K., Xi, K., …Wang, J. (2019). How important is carbonate dissolution in buried sandstones: evidences from petrography, porosity, experiments, and geochemical calculations. Petroleum Science, 16(4), 729-751. https://doi.org/10.1007/s12182-019-0344-4

Journal Article Type Article
Online Publication Date Jul 30, 2019
Publication Date Aug 2, 2019
Deposit Date Sep 4, 2019
Publicly Available Date Sep 4, 2019
Journal Petroleum Science
Print ISSN 1672-5107
Electronic ISSN 1995-8226
Publisher KeAi Communications
Peer Reviewed Peer Reviewed
Volume 16
Issue 4
Pages 729-751
DOI https://doi.org/10.1007/s12182-019-0344-4

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Copyright Statement
© The Author(s) 2019.
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.







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