| 江汉盆地潜江凹陷王场地区深层卤水水化学特征及成因研究 |
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| 关键词:Qianjiang sag underground brine water chemistry characteristic coefficient material source |
| 基金项目:国家自然科学基金项目(编号: U20A2092; 42002106);中央级公益性科研院所基本科研业务费专项(编号: KK2005);中国地质调查局地质调查项目(编号: DD20190816; DD20190606) |
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| Hydrochemical Characteristics and Genesis of Deep Brines in Wangchang Area, Qianjiang Depression, Jianghan Basin |
| There are strategic key mineral resources such as lithium, rubidium and cesium in oilfield brine of sedimentary basin. In this study, 18 underground brine samples from the Wangchang area in Qianjiang depression, Jianghan Basin were collected. Their chemical composition was tested, hydrochemical characteristics, element correlation, and characteristic coefficients were analyzed, and the genesis of deep brine in this area was discussed. The brine in the study area is found in the sandstone of the Paleogene Qianjiang Formation. The average total dissolved solid (TDS) concentration is 260.04 g/L, while the hydrochemistry type is Cl-Na, and the pH value is between 7.03 and 8.01. The TDS of brine in Qianjiang depression decreases yearly, which may be related to water injection. The contents of Na and Cl were positively correlated with TDS, and the contents of Li, K, B, and Br increased with an increase in TDS, while the content of Ca decreased with an increase in TDS, which may clarify the evaporation and concentration processes of the primary sedimentary brine. The high sodium-chloride coefficient (1.09~1.21) and chloro-bromine coefficient (480~1547.60), and the low potassium-chloride coefficient (3.75~14.82) indicate the contributions from the dissolution of stone salt. The fluctuating Ca/Mg coefficient and desulphurization coefficient reflect the uneven sealing and metamorphic degree, and the sealing and metamorphic degree increases from the first subduction to the fourth subduction. The underground brine in the study area is the primary evaporative deposit of the continental salt lake, which is supplemented by the obvious source of stone salt leaching. The overall sealing of the reservoir space is poor and the metamorphism degree is low. |
| XUE Yan,WANG Chun-lian,LIU Dian-he,WANG Jiu-yi,YAN Kai,PENG Yan-cong,GAO Xiu-fang.2022.Hydrochemical Characteristics and Genesis of Deep Brines in Wangchang Area, Qianjiang Depression, Jianghan Basin[J].Acta Geoscientica Sinica,43(3):347-358. |
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