北部湾盆地涠西南凹陷古近系层序结构与非构造圈闭
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摘要
运用Vail层序地层学理论,综合利用地震、测井、录井等资料,对涠西南凹陷古近系流沙港组和涠洲组进行层序地层划分,建立层序地层格架,分析层序结构特征及非构造圈闭的发育规律。在该地区共识别出1个一级层序界面、2个二级层序界面和8个三级层序界面,划分出10个三级层序。依据层序界面结构特征,将层序界面分为T1型、T2型和T3型3种类型;依据层序地层结构特征,将10个三级层序分为一分层序、二分层序、三分层序和四分层序4种类型。T1型和T3型层序界面之上有利于发育地层超覆不整合圈闭,T2型和T3型层序界面之下有利于发育不整合遮挡圈闭,三分和四分层序早期及二分和四分层序晚期有利于发育岩性圈闭。
Based on Vail sequence stratigraphic theory and analysis of seismic and logging information,the sequence in the Paleogene Liushagang and Weizhou formations in the Weixi’nan Sag is classified,the strata framework of sequence is defined and established,the characteristics of sequence structure are analyzed and the distribution of non-structural traps is revealed.One first-order sequence boundary,two second-order sequence boundaries,eight third-order sequence boundaries and ten third-order sequences are identified in the Liushagang and Weizhou formations.According to the characteristics of sequence boundary structure,the third-order sequence boundaries can be divided into three types: type T1,type T2,and type T3.And according to the characteristics of sequence stratigraphic structure,the ten third-order sequences can be classified into four types: one-divided sequence,two-divided sequence,three-divided sequence,and four-divided sequence.The favorable areas for the development of stratigraphic overlap traps are above type T1 and type T3 sequence boundaries,while the unconformity barrier traps are developed below type T2 and type T3 sequence boundaries.The favorable development periods of lithologic traps are the early period of three-divided sequence and four-divided sequence and the late period of two-divided sequence and four-divided sequence.
Based on Vail sequence stratigraphic theory and analysis of seismic and logging information,the sequence in the Paleogene Liushagang and Weizhou formations in the Weixi’nan Sag is classified,the strata framework of sequence is defined and established,the characteristics of sequence structure are analyzed and the distribution of non-structural traps is revealed.One first-order sequence boundary,two second-order sequence boundaries,eight third-order sequence boundaries and ten third-order sequences are identified in the Liushagang and Weizhou formations.According to the characteristics of sequence boundary structure,the third-order sequence boundaries can be divided into three types: type T1,type T2,and type T3.And according to the characteristics of sequence stratigraphic structure,the ten third-order sequences can be classified into four types: one-divided sequence,two-divided sequence,three-divided sequence,and four-divided sequence.The favorable areas for the development of stratigraphic overlap traps are above type T1 and type T3 sequence boundaries,while the unconformity barrier traps are developed below type T2 and type T3 sequence boundaries.The favorable development periods of lithologic traps are the early period of three-divided sequence and four-divided sequence and the late period of two-divided sequence and four-divided sequence.
引文
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[17]王健,操应长,刘明全,等.涠西南凹陷西部古近系流一段三角洲前缘滑塌浊积岩分布规律[J].石油地球物理勘探,2010,45(6):879-884.Wang Jian,Cao Yingchang,Liu Mingquan,et al.Fluxoturbiditedistribution for Paleogene Liu-1 Interval West delta front,WeiSouth-west Depression[J].Oil Geophysical Prospecting,2010,45(6):879-884.
[18]董贵能,李俊良.北部湾盆地涠西南凹陷流一段非构造油气藏[J].石油勘探与开发,2010,37(5):552-560.Dong Guineng,Li Junliang.Subtle hydrocarbon reservoirs in Liu-1Member of the Weixi’nan Sag,Beibuwan Basin,China[J].PetroleumExploration and Development,2010,37(5):552-560.
[2]朱伟林,江文荣.北部湾盆地涠西南凹陷断裂与油气藏[J].石油学报,1998,19(3):6-10.Zhu Weilin,Jiang Wenrong.Faults and oil&gas reservoirs of theWeixinan Depression in the Beibuwan Basin[J].Acta Petrolei Sinica,1998,19(3):6-10.
[3]席敏红,余学兵,黄建军.涠西南凹陷(西部)古近系层序地层及沉积特征研究[J].海洋石油,2007,27(3):1-12,21.Xi Minhong,Yu Xuebing,Huang Jianjun.Paleogene stratigraphicsequence and sedimentary feature in the west of WeixinanDepression[J].Offshore Oil,2007,27(3):1-12,21.
[4]李思田,潘元林,陆永潮,等.断陷湖盆隐蔽油藏预测及勘探的关键技术:高精度地震探测基础上的层序地层学研究[J].地球科学:中国地质大学学报,2002,27(5):592-598.Li Sitian,Pan Yuanlin,Lu Yongchao,et al.Key technology ofprospecting and exploration of subtle traps in lacustrine fault basins:Sequence stratigraphic researches on the basis of high resolutionseismic survey[J].Earth Science:Journal of China University ofGeosciences,2002,27(5):592-598.
[5]操应长.断陷湖盆层序地层下降体系域的划分[J].石油大学学报,2000,24(1):22-25.Cao Yingchang.Distinguishment of falling stage systems tract ofsequence strata in a continental rift-subsidence basin[J].Journal ofthe University of Petroleum,China,2000,24(1):22-25.
[6]吴因业,顾家裕,Cedric G,等.塔里木盆地满西区块强制海退体系域沉积模式[J].石油学报,2003,24(4):21-25.Wu Yinye,Gu Jiayu,Cedric G,et al.Depositional model for forcedregressive systems tract of Manxi Block in Tarim Basin[J].ActaPetrolei Sinica,2003,24(4):21-25.
[7]胡受权,郭文平,颜其彬,等.断陷湖盆陆相层序中体系域四分性探讨[J].石油学报,2000,21(1):23-28.Hu Shouquan,Guo Wenping,Yan Qibin,et al.Discussion on systemstract four-division for a terrigenous sequence stratigraphy infault-depressed lacustrine basin[J].Acta Petrolei Sinica,2000,21(1):23-28.
[8]Hunt D,Tucker M E.Stranded parasequences and the forcedregressive wedge systems tract:Deposition during base-level fall[J].Sedimentary Geology,1992,81(1/2):1-9.
[9]Morad S,Khalid A,Ketzer J M,et al.The impact of diagenesis onthe heterogeneity of sandstone reservoirs:A review of the role ofdepositional facies and sequence stratigraphy[J].AAPG Bulletin,2010,94(8):1267-1309.
[10]Martin J,Paola C,Abreu V,et al.Sequence stratigraphy ofexperimental strata under known conditions of differentialsubsidence and variable base level[J].AAPG Bulletin,2009,93(4):503-533.
[11]纪友亮,张世奇,张宏,等.层序地层学原理及层序成因机制模式[M].北京:地质出版社,1998.Ji Youliang,Zhang Shiqi,Zhang Hong,et al.Principles of sequencestratigraphy and sequence genetic mechanism mode[M].Beijing:Geological Publishing House,1998.
[12]王青春,鲍志东,贺萍.辽河坳陷西部凹陷北区湖盆深陷期层序地层响应[J].石油勘探与开发,2010,37(1):11-20.Wang Qingchun,Bao Zhidong,He Ping.Sequence stratigraphicresponses to the lacustrine basin deep-faulted period in the north areaof the western sag,Liaohe Depression[J].Petroleum Exploration andDevelopment,2010,37(1):11-20.
[13]鹿洪友,操应长,吴明荣,等.层序地层学应用于陆相湖盆中隐蔽油气藏的成因解释[J].大地构造与成矿学,2004,28(2):209-213.Lu Hongyou,Cao Yingchang,Wu Mingrong,et al.A discussion onthe genetic interpretation and classification of subtle trap reservoirby using sequence stratigraphic method[J].Geotectonica etMetallogenia,2004,28(2):209-213.
[14]林畅松,张燕梅,刘景彦,等.高精度层序地层学和储层预测[J].地学前缘,2000,7(3):111-117.Lin Changsong,Zhang Yanmei,Liu Jingyan,et al.High resolutionsequence stratigraphy and reservoir prediction[J].Earth ScienceFrontiers,2000,7(3):111-117.
[15]徐胜林,陈洪德,陈安清,等.四川盆地泥盆系—中三叠统层序格架内生储盖分布[J].石油勘探与开发,2011,38(2):159-167.Xu Shenglin,Chen Hongde,Chen Anqing,et al.Distribution ofsource-reservoir-cap rock assemblages within the sequenceframework from the Devonian to the Middle Triassic in the SichuanBasin[J].Petroleum Exploration and Development,2011,38(2):159-167.
[16]高喜龙,李照延,杨鹏飞,等.层序地层学在埕岛油田东斜坡隐蔽油气藏勘探中的应用[J].石油地球物理勘探,2002,37(B09):210-214.Gao Xilong,Li Zhaoyan,Yang Pengfei,et al.The application ofsequence stratigraphy on exploration of subtle trap of the east slopein Chengdao oil field[J].Oil Geophysical Prospecting,2002,37(B09):210-214.
[17]王健,操应长,刘明全,等.涠西南凹陷西部古近系流一段三角洲前缘滑塌浊积岩分布规律[J].石油地球物理勘探,2010,45(6):879-884.Wang Jian,Cao Yingchang,Liu Mingquan,et al.Fluxoturbiditedistribution for Paleogene Liu-1 Interval West delta front,WeiSouth-west Depression[J].Oil Geophysical Prospecting,2010,45(6):879-884.
[18]董贵能,李俊良.北部湾盆地涠西南凹陷流一段非构造油气藏[J].石油勘探与开发,2010,37(5):552-560.Dong Guineng,Li Junliang.Subtle hydrocarbon reservoirs in Liu-1Member of the Weixi’nan Sag,Beibuwan Basin,China[J].PetroleumExploration and Development,2010,37(5):552-560.
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