| 川东北地区三叠系聚盐成钾机制及富集模式 |
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| 引用本文： | 张兵,刘威,杨凯,裴文彬,张赛民,肖威.川东北地区三叠系聚盐成钾机制及富集模式[J].地球科学,2022,47(1):15-26. |
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| 作者姓名： | 张兵 刘威 杨凯 裴文彬 张赛民 肖威 |
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| 作者单位： | 成都理工大学地球勘探与信息技术教育部重点实验室, 四川成都 610059 |
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| 基金项目： | 中国地质调查局项目(No.DD20160054);国家自然科学基金项目(No.91755215)。 |
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| 摘 要： | 川东北地区三叠系发育巨厚的蒸发岩层,并赋存优质的深层富钾卤水.因构造沉积条件的整体差异,川东北富钾卤水的成因机制与富集规律未有详尽研究.以"气钾兼探"为指导思想,综合利用野外露头?岩心?测井等资料,对川东北地区三叠系蒸发岩分布规律以及岩相古地理演化进行分析,明确了膏盐盆在T1j4?5?T2l1期间规模逐渐缩小、向SW逐...
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| 关 键 词： | 川东北地区 富钾卤水 三叠系 岩相古地理 成钾机制 富集模式 地球化学 |
| 收稿时间： | 2020-12-31 |
Salt Accumulation,Potassium Formation Mechanism and Enrichment Model of Triassic in Northeast Sichuan Basin |
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| Zhang Bing,Liu Wei,Yang Kai,Pei Wenbin,Zhang Saimin,Xiao Wei.Salt Accumulation,Potassium Formation Mechanism and Enrichment Model of Triassic in Northeast Sichuan Basin[J].Earth Science-Journal of China University of Geosciences,2022,47(1):15-26. |
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| Authors: | Zhang Bing Liu Wei Yang Kai Pei Wenbin Zhang Saimin Xiao Wei |
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| Affiliation: | (Ministry of Education Key Laboratory of Earth Exploration and Information Technology,Chengdu University of Technology,Chengdu 610059,China) |
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| Abstract: | 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“gaspotassium 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 l1.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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| Keywords: | Northeast Sichuan Basin potassium-rich brine Triassic lithofacies paleogeography potassium formation mechanism enrichment model geochemistry |
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