Petroleum Science >2019, Issue 4: 729-751 DOI: https://doi.org/10.1007/s12182-019-0344-4
How important is carbonate dissolution in buried sandstones: evidences from petrography, porosity, experiments, and geochemical calculations Open Access
文章信息
作者:Guang-Hui Yuan, Ying-Chang Cao, Jon Gluyas, Yan-Zhong Wang, Ke-Yu Liu, Ke-Lai Xi, Tian Yang, Jian Wang
作者单位:
Key Laboratory of Deep Oil and Gas, School of Geoscience, China University of Petroleum, Qingdao, China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; Department of Earth Sciences, Durham University, Durham, UK
投稿时间:2018-06-15
引用方式:Yuan, GH., Cao, YC., Gluyas, J. et al. Pet. Sci. (2019) 16: 729. https://doi.org/10.1007/s12182-019-0344-4
文章摘要
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.
关键词
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Mesodiagenetic, Carbonate dissolution, Petrography, Geochemical, Buried sandstones