Citation: | Yuan He, Wenqi Li, Huichuan Liu, Nansheng Qiu, Kunyu Li, Cheng Xi, Xiaoliang Bai, Hongyu Long, Youlian Chen. Petrogenesis of the Dengying Formation Dolomite in Northeast Sichuan Basin, SW China: Constraints from Carbon-Oxygen Isotopic and Trace Elemental Data. Journal of Earth Science, 2025, 36(1): 75-88. doi: 10.1007/s12583-022-1732-z |
The widespread dolomite of the Sinian Dengying Formation in the Sichuan Basin (China) serves as one of the most important oil and gas reservoir rocks of the basin. Well WT1, as an exploration well, is recently drilled in the Kaijiang County, northeastern Sichuan Basin (SW China), and it drills through the Dengying Formation dolomite at the depth interval of 7 500–7 580 m. In this study, samples are systematically collected from the cores of that interval, followed by new analyses of carbon-oxygen isotope, major elements, trace elements, rare earth elements (REEs) and EPMA. The Dengying Formation dolomites of Well WT1 have δ13C values of 0.37‰ to 2.91‰ and δ18O values of -5.72‰ to -2.73‰, indicating that the dolomitization fluid is derived from contemporary seawater in the near-surface environment, rather than the burial environment. Based on the REE patterns of EPMA-based
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