Salt Accumulation, Potassium Formation Mechanism and Enrichment Model of Triassic in Northeast Sichuan Basin

被引：0

作者：

Zhang, Bing ^{[1
]}

Liu, Wei ^{[1
]}

Yang, Kai ^{[1
]}

Pei, Wenbin ^{[1
]}

Zhang, Saimin ^{[1
]}

Xiao, Wei ^{[1
]}

机构：

[1] Ministry of Education Key Laboratory of Earth Exploration and Information Technology, Chengdu University of Technology, Chengdu,610059, China

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2022年 / 47卷 / 01期

关键词：

Well logging - Petroleum prospecting - Analytical geochemistry - Seismology - Deposition;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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. © 2022, Editorial Department of Earth Science. All right reserved.

引用

页码：15 / 26