东营凹陷中带沙河街组三段浊积体储层特征类型与成因
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摘要
东营凹陷中带沙河街组三段的浊积扇体主要分布于洼陷的深凹部 ,可按成因分为滑塌浊积扇、坡移浊积扇和湖底扇3种类型 ,其形成与基准面的升降变化密切相关 :滑塌浊积扇形成于短期基准面下降期 ,由三角洲进积过程中前缘沉积物滑塌而成 ;坡移浊积扇形成于短期基准面上升期 ,是湖水动力及洪水作用等对三角洲前缘及三角洲平原沉积物进行侵蚀冲刷 ,使沉积物沿湖盆边缘斜坡移动至深水湖区再沉积而形成 ;湖底扇形成于中期基准面上升期 ,在层序中所处的位置与经典层序地层学低位体系域中的低位扇相当。 3类扇体中坡移浊积扇和湖底扇厚度大、储集物性好 ,含油气性好 ,是区内主要的储油砂体 ,而滑塌浊积扇规模相对较小 ,储集物性较差。
Turbidite fans in the 3 rdmember of Shahejie Formation in central Dongying depression,mainly distributed in the deepest sag of the depression,can be divided genetically into three types:slump turbidite fan,slope-sliding turbidite fan and sublacustrine fan.Their formation was closely related to the fluctuation of base level.Slump turbidite fans were formed during the short-term falling of base level,as a result of redeposition of the slumped frontal sediments of the prograding delta.Slope-sliding turbidite fans were formed during the short-term rising of base level,as a result of redeposition of sediments sliding from marginal slope of the lake basin to deep lake area,due to erosion and washing of delta front and plain by dynamic force of lake-and flood-water.Sublacustrine fans were formed during the medium-term rising of base level and located in the sequence stratigraphy corresponding to the lowstand fans in the lowstand system tract in classical sequence stratigraphy.Of these three types of turbidite fans,the sublacustrine fans and slope-sliding fans,with large thickness,good poroperm characteristics and petroliferous properties,are the main reservoirs in this area,while slump turbidite fans are characterized by smaller sizes and relatively poor poroperm characteristics.
Turbidite fans in the 3 rdmember of Shahejie Formation in central Dongying depression,mainly distributed in the deepest sag of the depression,can be divided genetically into three types:slump turbidite fan,slope-sliding turbidite fan and sublacustrine fan.Their formation was closely related to the fluctuation of base level.Slump turbidite fans were formed during the short-term falling of base level,as a result of redeposition of the slumped frontal sediments of the prograding delta.Slope-sliding turbidite fans were formed during the short-term rising of base level,as a result of redeposition of sediments sliding from marginal slope of the lake basin to deep lake area,due to erosion and washing of delta front and plain by dynamic force of lake-and flood-water.Sublacustrine fans were formed during the medium-term rising of base level and located in the sequence stratigraphy corresponding to the lowstand fans in the lowstand system tract in classical sequence stratigraphy.Of these three types of turbidite fans,the sublacustrine fans and slope-sliding fans,with large thickness,good poroperm characteristics and petroliferous properties,are the main reservoirs in this area,while slump turbidite fans are characterized by smaller sizes and relatively poor poroperm characteristics.
引文
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2 姜在兴,杨伟利,操应长.东营凹陷沙河街组三段—二段下亚段沉积层序及成因[J].石油与天然气地质,2002,23(2):127～129
3 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
4 WheelerHE .Baselevellithospheresurfaceandtime stratigraphy[J].BullGeolSocAmerica,1964,75:599～610
5 纪友亮,张世奇.陆相断陷盆地层序地层学[M].北京:石油工业出版社,1996.6～11
6 vanWagonerJC ,MitchumRM ,CampionKM ,etal.Siliclasticse quencestratigraphyinwelllogs,cores,andoutcrops:conceptsforhighresolutioncorrelationoftimeandfacies[J].AAPGMethodsinExplo ration,1990,7:1～55
7 王居峰,贾光华,刘军锷,等.史南地区沙三段浊积砂体成因模式探讨[J].油气地质与采收率,2003,10(4):8～10
8 邓宏文,王洪亮.层序地层基准面的识别、对比技术及应用[J].石油与天然气地质,1996,17(3):177～184
9 王居峰,蔡希源,邓宏文,等.东营凹陷中央洼陷带沙三段高分辨率层序地层与岩性圈闭[J].石油大学学报,2004,28(4):7～11
10 PaytonCE .地震地层学(在油气勘探中的应用)[M].牛毓荃,徐怀大译.北京:石油工业出版社,1980.70～83
11 CrossTA ,HomewoodPW .AmanzGressly’sroleinfoundingmodernstratigraphy[J].GeologicalSocietyofAmericaBulletin,1997,109:1617～1630
12 CrossTA ,LessengerMA .Sedimentvolumepartitioning:rationaleforstratigraphicmodelevaluationandhigh resolutionstratigraphiccorre lation[A].In:GradsteinFM ,SandvikKO ,MiltonNJ .Sequencestratigraphyconceptsandapplication[C].NPFspecialpublication,1998,8:171～195
13 李筱瑾.济阳坳陷浊积岩岩性油藏[A].见:潘元林,孔凡仙,杨申镳,等.中国隐蔽油气藏[C].北京:地质出版社,1998.46～56
14 袁选俊,谯汉生.渤海湾盆地富油气凹陷隐蔽油气藏勘探[J].石油与天然气地质,2002,23(2):130～133
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