荔湾3-1井区珠江组深水扇高分辨率层序分析及应用
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摘要
以高分辨率层序分析为指导思想,以岩芯和测井分析为基础,结合地震资料对荔湾3-1井区珠江组下部深水扇沉积层序界面和海泛面成因类型进行综合研究,探讨了深水扇短期旋回结构类型和分布规律,建立了主要产层时间—地层格架,并对地层格架中的小层砂体进行劈分和等时追踪对比,讨论了不同基准面旋回条件下储层发育特征。通过层序—岩相古地理编图,结合GR约束反演,刻画了不同发育阶段深水扇砂体展布特征,建立了深水扇水道砂体的时空间展布模式,对今后深水扇型油藏的砂体预测具有重要借鉴意义。
Through the comprehensive analysis of cores,well logs and seismic interpretation data,and under the guidance of the theory and technology of the high-resolution sequence stratigraphy,the characteristics of the different grade sequence interface and marine flooding surface in the Lower Zhujiang Formation Miocene in Liwan3-1 Block are studied.In this paper,the sequence structure and distribution of the short sequence of deep water fan are discussed,and the sequence and time stratigraphic framework of main reservoir is established.The small sand body layers in stratigraphic framework of the Zhujiang Formation in the study area are isochronously correlated and wedged,and the reservoir developmental features of different base-level cycles are discussed.It indicates that the canyon on the continental slope is an activity location of sedimentary process.The canyon was filled by sandy silt quickly in base-level ascending phase.A majority of sediment was carried to much deeper sea area than the study area,and only little sediment preserved or even caused stratigraphic lacuna in the study area.The A/S value(the change of the accommodation space to sediment supply ratios) of short sequence increasing in a vertical direction,and it indicates that deepwater fan was moving towards to shore land.The moving of the main channel of deepwater fan is an important reason for the stratigraphic lacuna under the channel.The deposit in the deepwater fan channel is most active in base-level initial ascending phase,characteristics as active progradation sequence that have downlap and onlap,and it will be beneficial to develop reservoir sand bodies.Effective accommodation space and deepwater fan moving towards to the source area accompany with sea level rising to the maximum flooding surface.It developed retrogradation sequence in this period and argillic layers grow in number because of the channel moving frequently.Variation of the accommodation space corresponding to base-level ascending or descending is the major factor that control short base-level cycle types and reservoir distribution in deep water fan system.Accompanying with sea level descending and effective accommodation space moving towards to the deep-sea plain,sediment in the deepwater fan channel in the study area was carried to deeper sea area by gravity current,and it would be more beneficial to develop reservoir sand bodies to the south of Liwan 3-1 area.The results of GR inversion indicate that sandstone characteristics as strong wave trough amplitude and low wave impedance attribute.The sandbodys stretch in N-S or NW-SE directions.The channel sandbody developed in the northland of the study area while the mudstone of continental slope developed in the southland.The sand body distribution of deep water fan in different stage is described by sequence-lithofacies paleogeographic mapping and GR inversion,and the temporal and spatial distribution model of channel sand body of deep water fan have been established.The results are useful in predicting sand body of deep water fan reservoir.
Through the comprehensive analysis of cores,well logs and seismic interpretation data,and under the guidance of the theory and technology of the high-resolution sequence stratigraphy,the characteristics of the different grade sequence interface and marine flooding surface in the Lower Zhujiang Formation Miocene in Liwan3-1 Block are studied.In this paper,the sequence structure and distribution of the short sequence of deep water fan are discussed,and the sequence and time stratigraphic framework of main reservoir is established.The small sand body layers in stratigraphic framework of the Zhujiang Formation in the study area are isochronously correlated and wedged,and the reservoir developmental features of different base-level cycles are discussed.It indicates that the canyon on the continental slope is an activity location of sedimentary process.The canyon was filled by sandy silt quickly in base-level ascending phase.A majority of sediment was carried to much deeper sea area than the study area,and only little sediment preserved or even caused stratigraphic lacuna in the study area.The A/S value(the change of the accommodation space to sediment supply ratios) of short sequence increasing in a vertical direction,and it indicates that deepwater fan was moving towards to shore land.The moving of the main channel of deepwater fan is an important reason for the stratigraphic lacuna under the channel.The deposit in the deepwater fan channel is most active in base-level initial ascending phase,characteristics as active progradation sequence that have downlap and onlap,and it will be beneficial to develop reservoir sand bodies.Effective accommodation space and deepwater fan moving towards to the source area accompany with sea level rising to the maximum flooding surface.It developed retrogradation sequence in this period and argillic layers grow in number because of the channel moving frequently.Variation of the accommodation space corresponding to base-level ascending or descending is the major factor that control short base-level cycle types and reservoir distribution in deep water fan system.Accompanying with sea level descending and effective accommodation space moving towards to the deep-sea plain,sediment in the deepwater fan channel in the study area was carried to deeper sea area by gravity current,and it would be more beneficial to develop reservoir sand bodies to the south of Liwan 3-1 area.The results of GR inversion indicate that sandstone characteristics as strong wave trough amplitude and low wave impedance attribute.The sandbodys stretch in N-S or NW-SE directions.The channel sandbody developed in the northland of the study area while the mudstone of continental slope developed in the southland.The sand body distribution of deep water fan in different stage is described by sequence-lithofacies paleogeographic mapping and GR inversion,and the temporal and spatial distribution model of channel sand body of deep water fan have been established.The results are useful in predicting sand body of deep water fan reservoir.
引文
1彭大钧,陈长民,庞雄,等.南海珠江口盆地深水扇系统的发现[J].石油学报,2004,25(5):17-23[Peng Dajun,Chen Changmin,Pang Xiong,et al.Discovery of deep-water fan system in South ChinaSea[J].Acta Petrolei Sinica,2004,25(5):17-23]
2彭大钧,陈长民,庞雄,等.从浅水陆架走向深水陆坡———南海深水扇系统的研究[J].石油学报,2005,23(1):1-11[Peng Dajun,Pang Xiong,Chen Changmin,et al.From shallow-water shelf to deep-water slope:The research of deep-water fan systems in South China Sea[J].Acta Sedimentologica Sinica,2005,23(1):1-11]
3彭大均,庞雄,陈长民,等.南海珠江深水扇系统的形成特征与控制因素[J].沉积学报,2006,24(1):10-19[Peng Dajun,PangXiong,Chen Changmin,et al.The characteristics and controlling fac-tors for the formation of deep-water fan system in South China Sea[J].Acta Sedimentologica Sinica,2006,24(1):10-19]
4彭大均,庞雄,黄先律,等.南海珠江深水扇系统的形成模式[J].石油学报,2007,28(5):7-1[Peng Dajun,Pang Xiong,Huang Xianlü,et al.Depositional model of Pearl River deep-water fansystem in South China Sea[J].Acta Petrolei Sinica,2007,28(5):7-11]
5 Cross T A,Lessenger M A.Sediment volume partitioning:rationale forstratigraphic model evaluation and high-resolution stratigraphic correla-tion[M]∥Gradstein F M,Sandvik K O,Milton N J,eds.SequenceStratigraphy Concepts and Applications.NPF Special Publication,1998,8:171-195
6郑荣才,彭军,吴朝容.陆相盆地基准面旋回的级次划分和研究意义[J].沉积学报,2001,19(2):249-245[Zheng Rongcai,PengJun,Wu Chaorong.Grade division of base-level cycles of terrigenousbasin and its implications[J].Acta Sedimentologica Sinica,2001,19(2):249-25]
7庞雄,陈长民,邵磊,等.白云运动:南海北部渐新统—中新统重大地质事件及其意义[J].地质论评,2007,53(2):145-15[PangXiong,Chen Changmin,Shao Lei,et al.Baiyun movement:a greattectonic event on the Oligocene-Miocene boundary in the northern SouthChina Sea and its implications[J].Geological Review,2007,53(2):145-152]
8柳保军,申俊,庞雄,等.珠江口盆地白云凹陷珠海组浅海三角洲沉积特征[J].石油学报,2007,28(2):49-61[Liu Baojun,ShenJun,Pang Xiong,et al.Characteristics of continental delta deposits inZhuhai Formation of Baiyun Depressionin Pearl River Mouth Basin[J].Acta Petrolei Sinica,2007,28(2):49-56]
9郑荣才,尹世民,彭军.基准面旋回结构与叠加样式的沉积动力学分析[J].沉积学报,2000,18(3):369-375[Zheng Rongcai,YinShiming,Peng Jun.Sedimentary dynamic analysis of sequence struc-ture and stacking pattern of base-level cycle[J].Acta SedimentologicaSinica,2000,18(3):369-375]
10郑荣才,彭军,彭光明,等.高分辨率层序分析在油藏开发工程中的应用———以百色盆地仑35块那二段油藏为例[J].沉积学报,2003,21(4):654-662[Zheng Rongcai,Peng Jun,Peng Guang-ming,et al.Analysis of high-rsolution sequence stratigraphy of thesecond member of Nadu Formation in Lun-35 block of Baise basin andits application in development of oil reservoir[J].Acta Sedimentologi-ca Sinica,2003,21(4):654-662]
11 Vail P R.Seismic-stratigraphy interpretation using sequence stratigra-phy.Pt.1:Seismic stratigraphy interpretation procedures[C]∥Bally AW.Atlas of seismic stratigraphy.AAPG Stedies in Geology,27,1987:1-10
2彭大钧,陈长民,庞雄,等.从浅水陆架走向深水陆坡———南海深水扇系统的研究[J].石油学报,2005,23(1):1-11[Peng Dajun,Pang Xiong,Chen Changmin,et al.From shallow-water shelf to deep-water slope:The research of deep-water fan systems in South China Sea[J].Acta Sedimentologica Sinica,2005,23(1):1-11]
3彭大均,庞雄,陈长民,等.南海珠江深水扇系统的形成特征与控制因素[J].沉积学报,2006,24(1):10-19[Peng Dajun,PangXiong,Chen Changmin,et al.The characteristics and controlling fac-tors for the formation of deep-water fan system in South China Sea[J].Acta Sedimentologica Sinica,2006,24(1):10-19]
4彭大均,庞雄,黄先律,等.南海珠江深水扇系统的形成模式[J].石油学报,2007,28(5):7-1[Peng Dajun,Pang Xiong,Huang Xianlü,et al.Depositional model of Pearl River deep-water fansystem in South China Sea[J].Acta Petrolei Sinica,2007,28(5):7-11]
5 Cross T A,Lessenger M A.Sediment volume partitioning:rationale forstratigraphic model evaluation and high-resolution stratigraphic correla-tion[M]∥Gradstein F M,Sandvik K O,Milton N J,eds.SequenceStratigraphy Concepts and Applications.NPF Special Publication,1998,8:171-195
6郑荣才,彭军,吴朝容.陆相盆地基准面旋回的级次划分和研究意义[J].沉积学报,2001,19(2):249-245[Zheng Rongcai,PengJun,Wu Chaorong.Grade division of base-level cycles of terrigenousbasin and its implications[J].Acta Sedimentologica Sinica,2001,19(2):249-25]
7庞雄,陈长民,邵磊,等.白云运动:南海北部渐新统—中新统重大地质事件及其意义[J].地质论评,2007,53(2):145-15[PangXiong,Chen Changmin,Shao Lei,et al.Baiyun movement:a greattectonic event on the Oligocene-Miocene boundary in the northern SouthChina Sea and its implications[J].Geological Review,2007,53(2):145-152]
8柳保军,申俊,庞雄,等.珠江口盆地白云凹陷珠海组浅海三角洲沉积特征[J].石油学报,2007,28(2):49-61[Liu Baojun,ShenJun,Pang Xiong,et al.Characteristics of continental delta deposits inZhuhai Formation of Baiyun Depressionin Pearl River Mouth Basin[J].Acta Petrolei Sinica,2007,28(2):49-56]
9郑荣才,尹世民,彭军.基准面旋回结构与叠加样式的沉积动力学分析[J].沉积学报,2000,18(3):369-375[Zheng Rongcai,YinShiming,Peng Jun.Sedimentary dynamic analysis of sequence struc-ture and stacking pattern of base-level cycle[J].Acta SedimentologicaSinica,2000,18(3):369-375]
10郑荣才,彭军,彭光明,等.高分辨率层序分析在油藏开发工程中的应用———以百色盆地仑35块那二段油藏为例[J].沉积学报,2003,21(4):654-662[Zheng Rongcai,Peng Jun,Peng Guang-ming,et al.Analysis of high-rsolution sequence stratigraphy of thesecond member of Nadu Formation in Lun-35 block of Baise basin andits application in development of oil reservoir[J].Acta Sedimentologi-ca Sinica,2003,21(4):654-662]
11 Vail P R.Seismic-stratigraphy interpretation using sequence stratigra-phy.Pt.1:Seismic stratigraphy interpretation procedures[C]∥Bally AW.Atlas of seismic stratigraphy.AAPG Stedies in Geology,27,1987:1-10
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