Feldspar dissolution with implications for reservoir quality in tight gas sandstones: evidence from the Eocene Es4 interval, Dongying Depression, Bohai Bay Basin, China

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• 作者：Benben Ma^a ; ^b ; ^c ; ^{mabenbenupc@163.coms} ; Yingchang Cao^b ; Yancong Jia^d
• 关键词：Tight gas sandstones ; Feldspar dissolution ; Dissolution by-products ; Reservoir quality ; Eocene ; Bohai Bay Basin
• 刊名：Journal of Petroleum Science and Engineering
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：150
• 期：Complete
• 页码：74-84
• 全文大小：2369 K
• 卷排序：150

文摘

Sublacustrine-fan sandstones in Es4 interval are tight gas reservoirs. Dissolution of feldspar in Es4 interval is related to organic acids and CO2 Feldspar dissolution is spatially with the by-products. Most of silica derived from K-feldspar dissolution precipitated within sandstones. The net porosities created by feldspar dissolution were insignificant.