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| 湖北潜江凹陷北部古近系孔隙卤水矿床特征及成因 |
| Deposit Characteristics and Origin of Paleogene Brine in the Qianjiang Formation of Qianjiang Depression |
| 投稿时间：2017-05-25 修订日期：2017-06-10 |
| DOI：10.12119/j.yhyj.201801003 |
| 中文关键词: 潜江组 卤水 矿床特征 成因 |
| 英文关键词:Qianjiang Formation Brine Deposit characteristics Origin |
| 基金项目:中国地质科学院基本科研业务费项目(YYWF201607) ；中国地质大调查项目(12120114051901) |
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| 中文摘要: |
| 深层卤水是我国重要的液体矿产资源,其中含有钾、锂、铷、铯、溴、碘、硼等高价值元素,具有广阔的综合利用开发前景。通过研究江汉盆地潜江凹陷北部地区潜江组卤水矿床的储层以及水化学特征,对该地区卤水成因及其成藏条件进行了分析。深层卤水赋存于潜江凹陷古近系潜江组砂岩中,水化学类型以硫酸钠亚型为主,其次为碳酸盐型、氯化钙型和硫酸镁亚型。总矿化度在221.3~323.5 g/L之间,平均值为274.08 g/L,酸碱度为4.5~6.5。潜江组卤水浓缩程度不高,变质程度低,体系较为开放。结合卤水矿床的水化学和储层特征,盆地卤水来源主要有火山—地热水的补给、基性火山岩的水—岩反应和蒸发岩的地下溶解。位于潜江凹陷北缘的钟西地区砂岩厚度大,具有巨大的储集空间,在构造—岩相作用下可能储藏了来自潜江凹陷南部古盐湖的卤水,因此潜江凹陷北部钟西地区砂岩具有较好的成藏条件。 |
| 英文摘要: |
| :Deep brine, containing high value elements such as potassium, lithium, rubidium, cesium, bromine, iodine and boron, is an important liquid mineral resource in China. It has broad prospects for comprehensive utilization. In this paper, the origin and reservoir forming condition of the brine are analyzed by studying the distributing feature of the reservoir and hydrochemical characteristics of the brine in the Qianjiang Formation in the north of Qianjiang Depression.Deep brine is deposits in the sandstone in the Qianjiang Formation of Qianjiang Depression.The water chemistry type is dominated by sodium sulfate subtype, followed by calcium chloride, carbonate and magnesium sulfate. The total salinity is from 221.3 to 323.50 g/L,averaging at 274.08 g/L, and the pH is from 4.5 to 6.5.Concentration degree of Qianjiang Formation brine is not high with low degree of metamorphism,and the system is more open.Combined with the hydrochemical and reservoir characteristics of the brine deposits, the basin brine sources should be from magmatic hydrothermal water recharge, basic-volcanic water-rock reaction and underground dissolution of the evaporite. The sandstone thickness in the Zhongxi area of the Qianjiang depression is large and has a huge reservoir space, and the brine deposits from the ancient salt lakes in the southern part of the Qianjiang Depression are stored under the tectonic-facies action. Therefore, there is a good reservoir-forming condition in the sandstone of the Zhongxi area, northern Qianjiang Depression. |
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