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• W2092301927 endingPage "245" @default.
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• W2092301927 abstract "Abstract Natural gas is found in U pper P ermian and L ower T riassic dolomite reservoirs of the NE S ichuan B asin, C hina. Studying the mechanisms for porosity‐modifying dolomitization and predicting its spatial distribution is of great importance for exploration and field appraisal. Subsurface core samples from the oolitic L ower T riassic F eixianguan Formation and outcrop samples reef carbonate Upper Permian Changxing Formation were studied using cathodoluminescence ( CL ), electron microprobe, fluid inclusion and isotope studies (δ 18 O, δ 13 C and 87 Sr/ 86 Sr), in an attempt to determine the origin of the dolomitizing fluids. Trace element and isotope data show that L ower T riassic seawater was most likely responsible for dolomitization of both the P ermian and T riassic rocks. Sr/Ca molar ratios, calculated for the diagenetic fluid, suggest seawater was involved in dolomitization. S trontium isotope data suggest that seawater 87 Sr/ 86 Sr during the Jialingjiang ( L ower T riassic) reached 0.7078; this ratio is recorded ubiquitously in both L ower T riassic oolitic dolomite and the underlying Lower Permian reef dolomite. In the P ermian C hangxing F ormation, elevated Triassic 87 Sr/ 86 Sr values have overprinted the significantly lower 87 Sr/ 86 Sr ratio characteristic of U pper P ermian seawater. Fluid inclusion analysis led to the conclusion that dolomitization must have commenced at a temperature lower than about 50°C. Integrating the sedimentology, petrology and geochemistry data, we conclude that coeval L ower T riassic ( F eixianguan or slightly younger) seawater caused dolomitization by a reflux‐seepage process for both the L ower T riassic and U pper P ermian units. There is no evidence for deep burial or meteoric‐marine mixing‐zone dolomitization. It is likely that evaporating seawater initially flowed into the highly porous oolitic Feixianguan Formation in a sabkha/lagoonal setting and precipitated anhydrite nodules and beds. Concomitant dolomitization, in the underlying Permian reef carbonates, continued during seepage even after the supply of sulphate was exhausted, leading to an absence of anhydrite in P ermian C hangxing F ormation." @default.
• W2092301927 created "2016-06-24" @default.
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• W2092301927 date "2013-04-13" @default.
• W2092301927 modified "2023-10-01" @default.
• W2092301927 title "Reflux dolomitization of the Upper Permian Changxing Formation and the Lower Triassic Feixianguan Formation, NE Sichuan Basin, China" @default.
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• W2092301927 doi "https://doi.org/10.1111/gfl.12034" @default.
• W2092301927 hasPublicationYear "2013" @default.
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