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Geochemical characteristics of the Permian Changxing Formation reef dolomites, northeastern Sichuan Basin, China

机译：四川盆地东北部二叠系长兴组礁白云岩的地球化学特征

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The recent discovery of deep and ultra-deep gas reservoirs in the Permian Changxing Formation reefs, northeastern Sichuan Basin is a significant development in marine carbonate oil & gas exploration in China. Reef dolomites and their origins have been major research topics for sedimentologists and oil & gas geologists. The petrography, trace element and isotope geochemistry of the reef dolomites indicated that the dolomites are characterized by low Sr and Mn contents, relatively low Fe contents, very similar δ~(13)C and δ~(18)O values and very different ~(87)Sr/~(86)Sr ratios. Although the calculated results of the fluid mixing suggested that a mixture with 85%–95% meteoric water and 5%–15% seawater seemed to be the dolomitizing fluids of the reef dolomites, the low Mn contents, relatively low Fe contents, high δ~(13)C values and high homogenization temperatures of the dolomites did not support that there were large proportions of meteoric water in the dolomitization process, and the ~(87)Sr/~(86)Sr ratios which were close to coeval seawater also did not support the possibility of the mixture of deep-burial circulated fluids from clastic rocks. High temperature deep-burial circulated seawater with low Mn and Fe contents, high Sr content and high δ~(13)C values from the dissolution of widely distributed Triassic evaporites during the burial diagenetic processes (including dehydration of water-bearing evaporites) could have been the dolomitizing fluids of the reef dolomites.
机译：近期在四川盆地东北部的二叠系长兴组礁中发现了深层和超深层气藏，这是中国海相碳酸盐岩油气勘探的重要进展。礁白云岩及其成因已成为沉积学家和油气地质学家的主要研究课题。礁白云岩的岩石学，微量元素和同位素地球化学表明，这些白云岩的特征是Sr和Mn含量低，Fe含量相对低，δ〜（13）C和δ〜（18）O值非常相似，且〜 （87）Sr /〜（86）Sr比尽管流体混合的计算结果表明，含85％–95％的陨石水和5％–15％的海水的混合物似乎是礁白云岩的白云石化流体，但锰含量低，铁含量相对低，δ高白云石的〜（13）C值和较高的均质温度不支持在白云石化过程中存在大量的陨石水，〜（87）Sr /〜（86）Sr之比也接近于同期海水不支持碎屑岩中深埋循环流体混合的可能性。 Mn和Fe含量低，Sr含量高和δ〜（13）C值高的高温深埋循环海水可能来自于广泛分布的三叠纪蒸发岩在成岩成岩作用（包括含水蒸发岩的脱水）过程中的溶解是礁白云岩的白云石化流体。

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