| 山东莱芜盆地西北缘古近系半固结含水岩组的特征及其成因 |
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| 引用本文：刘元晴,周乐,李伟,朱庆俊,徐蒙,吕琳,邓启军,何锦,王新峰.2018.山东莱芜盆地西北缘古近系半固结含水岩组的特征及其成因[J].地球学报,39(6):737-748. |
| DOI：10.3975/cagsb.2018.080801 |
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| 基金项目:国家自然科学基金项目(编号: 41240021);中国地质调查局水工环地质调查项目(编号: DD20160289) |
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| 中文摘要:通过岩心、测井、地下水常规离子组分及氢氧同位素样品测试对分布在莱芜盆地西北缘古近系半固结含水岩组物性、水化学特征及地下水补给循环特征进行研究; 结合古新世以来盆地沉积演化史及含水层成岩阶段划分, 分析半固结含水层地下水富集模式。结果表明, 埋深100 m以下的古近系砂砾岩含水层, 长期处在早成岩A期, 呈弱固结-半固结状态, 兼具裂隙与孔隙含水层特性, 且以孔隙为主。与碳酸盐岩含水层水化学特征相似, 水化学类型为HCO3-Ca?Mg型, 现代大气降水作为地下水主要补给来源, 蒸发浓缩作用, 碳酸盐岩、石膏及盐岩溶解参与了地下水化学组分形成。在莱芜盆地北部边界断裂处, 部分断裂所夹断块可作为古近系含水岩组应急找水靶区。 |
| 中文关键词:莱芜盆地 半固结含水岩组 早成岩A期 沉积演化史 水化学特征 |
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| The Characteristics and Genetic Analysis of the Paleogene Semi-consolidated Water-bearing Formation on the Northwestern Margin of Laiwu Basin, Shandong Province |
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| Abstract:The physical properties and characteristics of hydrochemistry and groundwater recharge cycle of the Paleogene semi-consolidated aquifer were recognized on the northwestern margin of Laiwu Basin based on core cataloging, logging, analyzing conventional ion components and hydrogen and oxygen isotopes. The model of groundwater enrichment in semi-consolidated aquifers was established in combination with the study of sedimentary evolution history since Paleocene and diagenesis stage division of the semi-consolidated aquifer. The results show that the Paleogene sand-gravel aquifer was in the early diagenetic stage A, which was buried more than 100 meters with the capacity of weak consolidation and semi-consolidation. The aquifer has both fracture and pore space characteristics, with the main space being pore space. The hydrochemical type is HCO3-Ca?Mg, similar to the type of carbonate aquifers. Modern precipitation is the main source of groundwater recharge. Evaporation and concentration, dissolution of carbonate, gypsum and salt rocks participated in the formation of hydrochemical components. In the zone of boundary fault, some fracture blocks can be regarded as the emergency water exploration target area of Paleogene water bearing formation. |
| keywords:Laiwu Basin semi-consolidated water bearing formation early diagenesis stage A sedimentary evolution history hydrochemical characteristics |
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