RECONSTRUCTION OF PALAEO-WATER DEPTH OF NEOCENE SHRINKING LAKE: AN EXAMPLE FROM THE SOUTH OF BODONG LOW UPLIFT, BOHAI SEA
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摘要:
探井揭示渤海海域东南部地区新近系发育高频河湖交互相沉积体系，砂体预测难度大，其中古湖盆水体深度是影响该区砂体展布的重要因素之一。通过元素地球化学、地层频谱属性趋势分析技术、古生物等多种技术方法对新近纪古湖盆水体特征进行恢复，结合古生物的古水深指示意义完成了新近纪湖泊萎缩期古湖盆水体深度的定量研究。研究结果表明：蓬莱7地区新近系发育缓坡沉积的淡水湖泊湖平面波动频繁，馆陶组沉积早期古水深较浅约3 m左右，馆陶组中后期古水深开始增加，并且呈现出从南向北逐渐加深的趋势。明化镇组下段中上部沉积时期古水深达最大，但明化镇组下段沉积时期水体深度主要在4~6 m范围内波动。
Abstract:The Neocene in the southeast Bohai Sea consists mainly of lacustrine, shallow water deltaic and fluvial facies. Drastic facies changes have made sandbody prediction very difficult. Palaeo-water depth of a lake is one of the key factors to sandbody distribution pattern. Based on geochemical data, INPEFA, paleontological and lithological data, the Neogene palaeo-water depth in the Penglai 7 area is investigated. The study area is located on the South of Bodong Low Uplift of the Bohai Sea.Results show that the area surrounding the Penglai 7 area was a fresh water lake with gentle slopes in Neogene. Lake level fluctuated frequently. The average depth of the area was around 3 m when the Guantao Formation was deposited. By the end of Guantao Formation, the lake level started rising. In the beginning, the water depth is deeper in south. However, it was reversed by the end of Guantao Formation and it became deeper in north. Water depth reached its peak in Late Minghuazhen Formation. The average depth of Penglai 7 area was around 4-6 m in the time when the Lower Member of Minghuazhen Formation was deposited.
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Key words:
- Bohai Sea /
- Neocene /
- palaeontology /
- palaeo-lacustrine basin /
- palaeo-water depth
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表 1 渤海海域新近纪常见水生植物与古水深指示关系
Table 1. The relationship between typical aquatic plant and paleo-water depth in Neogene of Bohai Sea
植物类型 挺水植物带 浮水植物带 沉水植物带 无水底植物带 浮游植物带 轮藻植物带 水深/m ＜1.5 1.5~3 多3~5, 局部到7 ＞7 4~6 2.5 属种类型 Sparganium stoloniferum Azolla Potamogeton Pediastrum 轮藻 Ranunculus Sporotrapoidites 
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