陆相断陷盆地陡坡带沉积相类型与沉积演化特征——以东营凹陷民丰地区沙三段、沙四段为例
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摘要
近年来的勘探实践证明,我国陆相断陷盆地的陡坡带具有砂体沉积类型多、纵向含油气层系多、富集高产油藏多等诸多有利的成藏因素,但受构造活动强烈、地形坡度陡、沉积物源近、相带变化快等因素的影响,对陡坡带沉积相类型及其分布的描述难度往往要高于盆地内的其他地区。综合应用钻井、岩心、测井、地震及各种化验分析资料,在东营凹陷民丰地区沙三段、沙四段识别出近岸水下扇、扇三角洲、河流三角洲、陡坡深水浊积扇、坡移浊积扇等若干种与油气勘探密切相关的沉积相类型。结合古构造、古气候、基准面旋回变化等,分析了沙四段—沙三段主要沉积相的沉积演化与分布特征,旨在对类似地区的油气勘探有所裨益。
Exploration practices in recent years show that steep slope belts on terrestrial fault-depressed basins in China feature many favorable reservoir-forming factors such as versatile sandbody types, multiple oil or gas bearing layers and rich reservoir of high productivity. Due to factors like intense tectonic movements, steep slope topography, sediments near source rock and rapid change of facies, usually sedimentary facies and their distribution on steep slope belts are even harder to describe than the other basin units. By utilizing comprehensive information and data on drilling, core, logging, seismic and various analytic testing results in this article, several sedimentary facies such as nearshore submarine fan, fan delta, fluvial delta, deep water turbidities fan on steep slope, moved slope turbidities fan, all of which are closely related to oil and gas exploration, are identified at the Sha 4 & 3 member, Minfeng area of Dongying Depression. Combining with paleostructure, paleoclimate and datum plane cycle in this area, the article analyzes the key sedimentary facies evolution and distribution features of Sha 4 and 3 member, offering applicable instructions for oil and gas exploration in similar geological areas.
Exploration practices in recent years show that steep slope belts on terrestrial fault-depressed basins in China feature many favorable reservoir-forming factors such as versatile sandbody types, multiple oil or gas bearing layers and rich reservoir of high productivity. Due to factors like intense tectonic movements, steep slope topography, sediments near source rock and rapid change of facies, usually sedimentary facies and their distribution on steep slope belts are even harder to describe than the other basin units. By utilizing comprehensive information and data on drilling, core, logging, seismic and various analytic testing results in this article, several sedimentary facies such as nearshore submarine fan, fan delta, fluvial delta, deep water turbidities fan on steep slope, moved slope turbidities fan, all of which are closely related to oil and gas exploration, are identified at the Sha 4 & 3 member, Minfeng area of Dongying Depression. Combining with paleostructure, paleoclimate and datum plane cycle in this area, the article analyzes the key sedimentary facies evolution and distribution features of Sha 4 and 3 member, offering applicable instructions for oil and gas exploration in similar geological areas.
引文
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[2]李丕龙,张善文,曲寿利,等.陆相断陷盆地油气地质与勘探(卷二)[M].北京:石油工业出版社,地质出版社,2003:70-78.
[3]谢晓军,邓宏文.陆相断陷盆地构造—层序地层研究需注意的几个问题[J].天然气地球科学,2006,18(6):838-842.
[4]冯增昭.沉积岩石学[M].北京:石油工业出版社,1993:145-146.
[5]康仁华,刘魁元,赵翠霞,等.济阳坳陷渤南洼陷古近系沙河街组沉积相[J].古地理学报,2002,4(4):19-28.
[6]赵澄林,张善文,袁静,等.胜利油区沉积储层与油气[M].北京:石油工业出版社,1999:21-27.
[7]邱桂强,王居峰,张昕,等.东营三角洲沙河街组三段中亚段地层格架初步研究及油气勘探意义[J].沉积学报,2002,19(4):569-574.
[8]王居峰.东营三角洲—浊积扇高频层序叠加样式与岩性圈闭[J].沉积学报,2005,23(2):13-19.
[9]王居峰,蔡希源,邓宏文,等.渤海湾盆地东营凹陷中央洼陷带沙三段基准面旋回变化与岩性圈闭[J].石油实验地质,2003,25(4):357-360.
[10]杨占龙,陈启林.岩性圈闭与陆相盆地岩性油气藏勘探[J].天然气地球科学,2006,17(5):622-626.
[11]王居峰.济阳坳陷东营凹陷古近系沙河街组沉积相[J].古地理学报,2005,7(1):45-58
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