| 摘要: |
| 利用地震资料对整个盆地的追踪和对比, 结合钻井资料, 对北部湾古湖进行分析发现: 古湖发育始于古新世, 到始新世流沙港期进入鼎盛时期, 湖泊规模最大达5000km2, 沉积了巨厚沉积物, 最大沉积厚度达4700m。井资料分析显示, 在始新统流沙港三段、二段各古湖沉积物中浮游藻类和沉积有机质含量高, 说明该两段具有较高的生物生产力; 流一段和涠洲组沉积物中仅在涠西南古湖和乌石古湖内浮游藻类和沉积有机质具有较高的含量, 因此涠西南与乌石具有更好的烃源条件。 |
| 关键词: 古湖泊, 烃源条件, 高生产力 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学九五重点资助项目/ 南海北部边缘盆地的活动热流体和成藏动力学及地质背景0 , 49732005 号。 |
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| PALAEOLIMOLOGY AND HYDROCARBON POTENTIAL IN BEIBU GULF BASIN OF SOUTH CHINA SEA |
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ZHU Wei-Lin1,2, WU Guo-Xuan,1,2, LI Ming-Bi1,2
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1.Laboratory of Marine Geology , Tongj i University;2.China National Off shore Oil Exploration and Development Research Center
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| Abstract: |
| Using seismic data and correlating cores between wells, we studied paleogeography of the Beibu Gulf Basin. This basin is located on the northern shelf of the South China Sea. Tectonically, it is a rift or graben developed on the Paleozoic basement.A series of half- grabens appeared during the Paleogene rifting stage, which formed paleo- lakes, including six paleo-lakes:Weixinan, Wushi, Maichen, Haizhong, Fushan and Haitoubei. These ancient lakes initiated in Paleocene, maximized in Liushagang Stage of Eocene in scale, with the area of 5000 km2 and 4700m thick sediments. Core analysis showed that there were high contents of planktonic algae and sedimentary organic matter in Members 2 and 3 of the Eocene Liushangang Formation, indicating a high hydrocarbon potential. Higher organic concentration was found in Member 1 of Liushagang Formation and Weizhou Formation in Weixinan Paleo-lake and Wushi Paleo-lake; therefore, better hydrocarbon resource can be predicted. |
| Key words: Paleo-lake, Hydrocarbon exploration, Beibu Gulf, South China Sea |
