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| Citation: | Zhang Bing, Liu Wei, Yang Kai, Pei Wenbin, Zhang Saimin, Xiao Wei, 2022. Salt Accumulation, Potassium Formation Mechanism and Enrichment Model of Triassic in Northeast Sichuan Basin. Earth Science, 47(1): 15-26. doi: 10.3799/dqkx.2021.040
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During the Triassic period, the Northeast Sichuan developed a huge evaporative salt layer and accumulated high quality deep potassium-rich brine. Due to the overall differences in tectonic depositional conditions, the genetic mechanism and enrichment rules of potassium-rich brine in Northeast Sichuan Basin have not been studied in detail. In this study it takes "gas-potassium exploration" as the guiding ideology, and comprehensively utilizes the field outcrop-core-logging data to analyze the distribution and lithofacies paleogeographic evolution of the Triassic evaporite in the Northeast Sichuan basin, and finally it shows the size of salt basin in Northeast Sichuan decreased gradually and migrated to southwest during T1j4-5-T2l1. Combined with core and brine geochemical analysis, it is concluded that the genesis mechanism of potassium-rich brine in Northeast Sichuan is mainly seawater evaporation-concentration mechanism and surface fresh water leaching mechanism, and the deep water-rock reaction is weak. Combined with well logging and seismic interpretation, it is proposed that the potassium-rich brine has the enrichment rule of "controlling brine by the gypsum basin and salt basin; storing brine in the pores and fractures; enriching brine in the core of anticline". It is considered that the potassium-rich brine is a "secondary deep depression" enrichment model controlled by "structure-deposition" dual factors.
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