| 北部湾盆地涠西南凹陷湖底扇的沉积特征 |
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| 引用本文： | 董贵能,邓,勇,盖永浩,赵顺兰,舒克栋,王,彬.北部湾盆地涠西南凹陷湖底扇的沉积特征[J].沉积学报,2014,32(2):218-227. |
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| 作者姓名： | 董贵能 邓 勇 盖永浩 赵顺兰 舒克栋 王 彬 |
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| 作者单位： | 中海石油(中国)有限公司湛江分公司; |
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| 摘 要： | 综合利用岩芯、测井、地震和粒度曲线等资料，研究了涠西南凹陷古近系流沙港组一段湖底扇的沉积特征。结果表明，湖底扇具有典型浊积岩的鲍马序列特征，且分为高能量型沉积和低能量型沉积两种，在沉积结构上，粒度概率图和C-M图具有浊流沉积独有的粒度分布特征，同时具有丰富的浊流沉积构造现象。涠西南湖底扇在陡峭的古地貌和充足的物源供应条件下形成，沉积在断裂坡折带或同沉积坡折带坡脚的深水区。湖底扇沉积于深水区，圈闭条件好，临近烃源岩，油源富足，易于形成油气藏，已有多口井钻获工业油流，勘探前景广阔。
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| 关 键 词： | 涠西南凹陷 湖底扇 沉积特征 勘探潜力 |
Sedimentary Characteristics of Sublacustrine Fan in Weixi’nan Sag of Beibuwan Basin |
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| Abstract: | On the basis of integrated analysis of core, well logging, seismic and grain size probability curves data, sedimentary characteristics of sublacustrine fan in Liu-1 Formation of Weixinan sag is comprehensively studied. Sublacustrine fan is characterized by the Bouma sequence implying typical turbidite, it is classified into two types of powerful hydrodynamic sedimentation and weak hydrodynamic sedimentation. For depositional texture, sublacustrine fan features grain distribution character of typical turbidite deposit in terms of grain size probability curves and C-M map, moreover, it contains large numbers of turbidite deposit structures. Sublacustrine fan is resulted from the condition of cliffy paleolandform and abundant sedimentary supply, and formed at the location of deep water lacustrine area of fault slope-break zone or syndepositional structural slope-break zone. The sublacustrine fan formed from deep lacustrine, trap condition is excellent, a near source rock, hydrocarbon source is abundant, easily forming hydrocarbon reservoirs, already obtained commercial oil-gas flow in numbers of drilled well, and have great exploration foreground. |
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