珠江口盆地东部第三纪沉积环境与古地下水流模式

基金项目: 中国海洋石油南海东部公司科研项目

TERTIARY SEDIMENTARY ENVIRONMENTS AND PALAEO GROUNDWATER FLOW PATTERNS IN EASTERN PEARL RIVER MOUTH BASIN

摘要: 通过对珠江口盆地东部第三纪沉积环境的分析, 认为构造运动控制的海平面升降既影响着同期沉积物的沉积特征, 也决定了古地下水流的运动模式.珠江口盆地东部海陆交互式的环境演变, 使入渗势与压实势此消彼涨, 它们共同影响着第三纪古地下水流模式的变化.
- 珠江口盆地 /
- 第三纪 /
- 沉积环境 /
- 古地下水流模式 /
- 入渗势 /
- 压实势
Abstract: The analysis of the Tertiary sedimentary environments in the eastern Pearl River Mouth basin shows that the sea level fluctuations controlled by the tectonic movements not only affected the syndepositional features, but also determined the patterns of palaeo groundwater flow. The environmental evolution marked by the alternation of continental and marine facies may give rise to the change between the infiltration potential and the compaction potential. In consequence, both potentials affect the changes in the Tertiary palaeo groundwater flow patterns.
- Pearl River Mouth basin /
- Tertiary /
- sedimentary environment /
- palaeo groundwater flow pattern /
- infiltration potential /
- compaction potential

图 1 珠江口盆地东部构造略图

Fig. 1. Tectonic framework of eastern Pearl River Mouth basin

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图 2 珠江口盆地海岸上超变化^[2]

t₁.层序年龄; t₂.海泛面年龄; d.离岸距离

Fig. 2. Variation of sea-coastal onlap in Pearl River Mouth basin

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图 3 坳陷盆地北缘压实水流与入渗水流关系

a.海岸上超时期压实水控制流场; b.海退时期入渗水控制流场.图右侧均存在区域排泄带.1.低渗透层(含压实释水层); 2.高渗透层(含入渗水); 3.高渗透层(含同生水及压实水); 4.不同类型水界线; 5.降水入渗; 6.压实释水; 7.地下水流向; 8.地下水位; 9.海水位; 10.泉

Fig. 3. Relation between compaction water and infiltrating water in northern border of sag basin

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图 4 珠江口盆地珠Ⅰ坳陷地下水运动模式

a.早中新世无隔水盖层期; b.早中新世薄隔水盖层期; c.早中新世厚隔水盖层期.1.前第三系基岩; 2.下第三系泥岩-压实释水层; 3.主要含水层(砂岩及碳酸盐岩、生物礁); 4.垂向隔水岩层; 5.断裂; 6.泥岩压实释水; 7.降水及入渗水流; 8.地下水流向, 虚线表示面状越流; A.交汇排泄带; B.边岸排泄带; C.断裂排泄带; D.生物礁滩(含裸岩层) 排泄带

Fig. 4. Groundwater flow pattern of ZhuⅠ sag in Pearl River Mouth basin

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