| 柴达木盆地卤水钾盐迁聚规律与找矿新突破 |
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| 引用本文：张永生,侯献华,郑绵平,陈安东,乜 贞,袁文虎,施林峰,宋高,牛新生,樊 馥,汪万录,马宏涛,王云生,曾思敏,商雯君.2024.柴达木盆地卤水钾盐迁聚规律与找矿新突破[J].地球学报,45(5):643-650. |
| DOI：10.3975/cagsb.2024.090201 |
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| 基金项目:自然资源部“高原荒漠区战略性矿产勘查开发技术创新中心”开放研究课题(编号: KFKT20230103);中国地质调查局地质调查项目(编号: DD20230755) |
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| 中文摘要:钾盐是我国大宗紧缺战略性“粮食”矿产, 对保障国家粮食安全具有重要意义。我国钾盐资源具有需求量大、对外依存度高等特点, 寻找新的钾盐矿床、形成新的大型钾盐资源基地刻不容缓。2023年, 中国地质调查局组织开展青海柴达木盆地钾盐“增储保供”地质调查工作, 在前期对柴达木盆地成盐聚钾规律性认识的基础上, 于柴西北大浪滩—黑北凹地部署实施了“探采一体化”柴钾1井, 钻获1 021.95 m(井深111.54~1 133.49 m)巨厚松散砂砾储卤层, 全井段抽卤试验获日稳定涌水量8 586 m3/d、水位降深11.3 m、单位涌水量759.89 m3/d?m、氯化钾平均含量为0.54%的高产工业品位“砂砾型”卤水钾矿, 取得了柴达木盆地陆相深层卤水钾盐找矿新突破, 为形成中国新的亿吨级大型钾盐基地夯实了资源基础。 |
| 中文关键词:“砂砾型”含钾卤水 柴钾1井 大浪滩—黑北凹地 大型钾盐资源基地 下更新统 |
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| Migration and Accumulation Patterns of Potassium Salts in Brine from the Qaidam Basin and New Breakthroughs in Mineral Exploration |
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| Abstract:In China, potash resources are crucial strategic minerals that play a vital role in ensuring national food security. With the significant demand for and high external dependence on potash resources, there is an urgent need to explore new potash deposits and establish new large-scale potash resource bases. In 2023, the China Geological Survey organized geological surveys focusing on “increasing reserves and ensuring the supply” of potash resources in the Qaidam Basin, Qinghai Province. Building on a previous understanding of salt formation and potassium aggregation in the basin, the integrated drilling and exploration project, CK1 well, was successfully executed in Dalangtan–Heibei concave in the northwestern Qaidam Basin. The well penetrated a thick layer of loose sand and gravel brine reservoirs, reaching a depth of 1 021.95 meters (111.54–1 133.49 m). Pumping tests revealed a stable daily water inflow of 8 586 m3/d with a drawdown of 11.3 m and a specific yield of 759.89 m3/d?m. The average content of potassium chloride was 0.53%, representing a high-yield industrial-grade “sand-gravel type” potassium brine deposit. This achievement marks a significant breakthrough in deep-seated terrestrial brine potash resource exploration in the Qaidam Basin, laying a solid foundation for establishing a new billion-ton-scale potash resource base in China. |
| keywords:“sand-gravel type” potassium-containing brine CK1 drill core Dalangtan–Heibei concave large-scale potash resource base Early Pleistocene |
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