陆相断陷盆地层序类型与隐蔽油气藏勘探——以南堡凹陷古近系为例
摘要
以南堡凹陷高分辨率三维地震、测井和丰富的地质资料为基础 ,运用高精度层序地层分析方法 ,结合盆地构造和沉积充填特征的研究 ,在南堡凹陷古近系识别出了 1个超层序组、4个超层序、11个三级层序 ,在柳北扇三角洲体系可划分出 6个四级层序 .根据古构造坡折带控制层序类型和层序构成模式的思路 ,通过南堡凹陷古近系同沉积构造发育特征的分析 ,认为南堡凹陷古近系存在同沉积断裂坡折带和同沉积背斜挠曲坡折带 2种类型 ,由此决定了南堡凹陷古近系主要发育了同生断裂坡折型层序和同沉积背斜挠曲坡折型层序 ,建立了这 2种类型层序体系域构成模式 .其中同生断裂坡折型层序和同沉积背斜挠曲坡折型层序的低位域砂体及高位域砂体成藏条件优越、地震剖面易于识别 ,是隐蔽油气藏勘探的主要目标
Based on integrated analysis of high-resolution 3D seismic sections, log curves and abundant geological data, basin filling sequence in the Lower Tertiary Nanpu depression consists of one super sequence set, four super sequences, and eleven third-order sequences. The North Liuzhan fan delta system can be divided further into six fourth-order sequences. Two kinds of slope-breaks are developed in this basin, one is the syndepositional fault slope-break, the other is the syndepositional bend slope-break, which control clearly sequence types and stratigraphic models. Corresponding two kinds of sequence patterns are observed in Lower Tertiary Nanpu depression, that are the syndepositional fault slope-break and syndepositional bend slope-break sequences. The lowstand sand bodies and highstand sand bodies in the both sequences are favorable for hydrocarbon accumulation, and can be identified on seismic section easily, hence, they are taken as main targets for subtle trap exploration.
Based on integrated analysis of high-resolution 3D seismic sections, log curves and abundant geological data, basin filling sequence in the Lower Tertiary Nanpu depression consists of one super sequence set, four super sequences, and eleven third-order sequences. The North Liuzhan fan delta system can be divided further into six fourth-order sequences. Two kinds of slope-breaks are developed in this basin, one is the syndepositional fault slope-break, the other is the syndepositional bend slope-break, which control clearly sequence types and stratigraphic models. Corresponding two kinds of sequence patterns are observed in Lower Tertiary Nanpu depression, that are the syndepositional fault slope-break and syndepositional bend slope-break sequences. The lowstand sand bodies and highstand sand bodies in the both sequences are favorable for hydrocarbon accumulation, and can be identified on seismic section easily, hence, they are taken as main targets for subtle trap exploration.
引文
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纪友亮,张世琦,1996.陆相断陷盆地层序地层学.第一版.北京:石油工业出版社,1-74.
林畅松,潘元林,肖建新,等,2000.构造坡折带———断陷湖盆层序和油气预测的重要概念.地球科学———中国地质大学学报,25(3):260-267.
魏魁生,徐怀大,1997.松辽盆地百垩系高分辨率层序地层格架.石油与天然气地质,18(1):7-13.
Feng,Y .L .,Li,S .T .,Xie,X .N .,2000.Dynamicsofsequencegenerationandsequencestratigraphicmodelincontinentalrift subsidencebasin.EarthScienceFrontiers,7(3):119-132(inChinesewithEnglishabstract)
Feng,Y .L .,Qiu,Y .G .,2003.Applicationofhigh resolutionsequencestratigraphytoexplorationofLowerTertiarysubtlereservoirsinJiyangsubbasin.ActaPetroleiSinica,24(1):49-52(inChinesewithEnglishabstract).
Howell,J.A .,Flint,S .S .,1996.Amodelforhighresolutionsequencestratigraphywithinextensionalbasins.In:How ell,J .A .,Aitken,J .F .,eds.,Highresolutionsequencestratigraphy:InnovationsandApplications.GeologicalSo cietySpecialPublicationNo.104,London,129-137.
Ji,Y .L .,Zhang,S .Q .,1996.Sequencestratigraphyofconti nentalrift subsidencelacustrinebasin.1stedition.PetroleumIndustryPress,Beijing,1-74(inChinese).Lin,C .S .,Pan,Y .L .,Xiao,J .X .,etal.,2000.Structuralslope breakzone:Keyconceptforstratigraphicsequenceanalysisand petroleumforecastinginfaultsubsidencebasin.EarthScience—JournalofChinaUniversityofGeosciences,25(3):260-267(inChinesewithEnglishabstract).
Vail,P .R .,Audemard,F .,Bowman,S .A .,etal.,1991.Thestratigraphicsignaturesoftectonics,eustasyandsedimen tology—Anoverview.In:Einsele,G .,Ricken,W .,Seilacher,A .,eds.,Cyclesandeventsinstratigraphy.SpringerVerlag,Berlin,617-659.
Wei,K .S .,Xu,H .D .,1997.Cretaceoushigh resolutionse quencestratigraphicframeworkinSongliaobasin.Oil&GasGeology,18(1):7-13(inChinesewithEnglishab stract).
冯有良,李思田,2001.东营凹陷沙三段层序低位域砂体沉积特征.地质论评,47(3):278-286.
冯有良,李思田,解习农,2000.陆相断陷盆地层序形成动力学及层序地层模式.地学前缘,7(3):119-132.
冯有良,邱以刚,2003.高精度层序地层学在济阳坳陷古近系隐蔽油气藏勘探中的应用.石油学报,24(1):49-52.
纪友亮,张世琦,1996.陆相断陷盆地层序地层学.第一版.北京:石油工业出版社,1-74.
林畅松,潘元林,肖建新,等,2000.构造坡折带———断陷湖盆层序和油气预测的重要概念.地球科学———中国地质大学学报,25(3):260-267.
魏魁生,徐怀大,1997.松辽盆地百垩系高分辨率层序地层格架.石油与天然气地质,18(1):7-13.
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