涠西南凹陷A井区古近系流沙港组一段砂体沉积特征及分布规律
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摘要
涠西南凹陷A井区古近系流沙港组一段下亚段发育了大规模的砂砾岩沉积。岩芯观察及分析化验资料表明砂砾岩沉积发育丰富的能够反映浊流沉积的鲍马序列、冲刷充填及变形构造等沉积构造并具有直线一段式和上拱一段式等粒度概率曲线类型。垂向以多个底部发育冲刷充填构造的正旋回叠加为特征,整体表现为正序。沉积特征表明砂砾岩为湖底扇沉积。综合利用地震反射特征及垂向地层叠加样式等方法,在流一段湖底扇内共识别出3个五级层序,将湖底扇沉积划分为3期。各旋回湖底扇砂体厚度与平均波峰振幅、能量半时及瞬时频率等地震属性有良好的相关关系。在高精度层序地层格架的约束下,结合钻井及录井资料分析与地震属性分析,对3期湖底扇砂体平面分布特征进行了研究,各期湖底扇具有左右迁移摆动、垂向叠置发育的特征。由于受到3号控盆断层和0号隐伏断层的影响,使得涠西南低突起北缘发育的5号断层幕式活动,导致研究区可容空间发生转换,构造运动控制的可容空间不均衡转换是控制流一段湖底扇砂体分布规律的主要因素。
Large scale glutenite was developed in the sedimentary period of the lower submember of first Member of Liushagang Formation of Paleogene in A well field of Weixinan Depression.Core and analysis and test data l suggest that the sandbody developed abundant sedimentary structure of Bouma cycle,erosion and loading,and the deformation structure and has the type of grain size accumulation curve of uphill arched " 1 segment" pattern and line " 1 segment" pattern.In vertical section,characterized by superposition of several positive cycles with the sedimentary structure of erosion and loading in the bottom,phase sequence displays the positive sequence as a whole.Sedimentary characteristics showed that the glutenite was sublacustrine fan.3 stages of sublacustrine fan deposits have been recognized according to the seismic reflection characteristics and the patterns of superposition of verstical formation.In each stage the thickness of sand body of sublacustrine fan is well related to the seismic attribution of average peak amplitude,energy half time and instantaneous frequency.Under the constraint of high resolution sequence stratigraphic framework,combined with well drilling,logging and analysis of seismic attribution,each stage of sublacustrine fan is characterized by contstant migration and wiggle in two-dimensional system,and superimposed development in the vertical evolution.The episodic activity of No.5 fault as a result of the influence of No.0 fault and No.3 fault,led to the transformation of accommatation space.So,the unbalanced transformation of accommatation space constrainted by structure activity is the main factor controlling the distribution of sand body of sublacustrine fan of the first Member of Liushagang Formation.
Large scale glutenite was developed in the sedimentary period of the lower submember of first Member of Liushagang Formation of Paleogene in A well field of Weixinan Depression.Core and analysis and test data l suggest that the sandbody developed abundant sedimentary structure of Bouma cycle,erosion and loading,and the deformation structure and has the type of grain size accumulation curve of uphill arched " 1 segment" pattern and line " 1 segment" pattern.In vertical section,characterized by superposition of several positive cycles with the sedimentary structure of erosion and loading in the bottom,phase sequence displays the positive sequence as a whole.Sedimentary characteristics showed that the glutenite was sublacustrine fan.3 stages of sublacustrine fan deposits have been recognized according to the seismic reflection characteristics and the patterns of superposition of verstical formation.In each stage the thickness of sand body of sublacustrine fan is well related to the seismic attribution of average peak amplitude,energy half time and instantaneous frequency.Under the constraint of high resolution sequence stratigraphic framework,combined with well drilling,logging and analysis of seismic attribution,each stage of sublacustrine fan is characterized by contstant migration and wiggle in two-dimensional system,and superimposed development in the vertical evolution.The episodic activity of No.5 fault as a result of the influence of No.0 fault and No.3 fault,led to the transformation of accommatation space.So,the unbalanced transformation of accommatation space constrainted by structure activity is the main factor controlling the distribution of sand body of sublacustrine fan of the first Member of Liushagang Formation.
引文
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18朱筱敏,刘长利,张义娜,等.地震沉积学在陆相湖盆三角洲砂体预测中的应用[J].沉积学报,2009,27(5):915-921[Zhu Xi-aomin,Liu Changli,Zhang Yina,et al.On seismic sedimentology oflacustrine deltaic depositional systems[J].Acta Sedimentologica Sini-ca,2009,27(5):915-921]
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20孟令箭,童亨茂,蔡东升,等.北部湾盆地涠西南凹陷断裂系统成因的砂箱实验研究及启示[J].高校地质学报,2009,15(2):246-255[Meng Lingjian,Tong Hengmao,et al.Sandbox modellingon genetic mechanism of fault system in Weixinan Depression of theBeibu-gulf Basin and its inspiration[J].Geological Journal of ChinaUniversities,2009,15(2):246-255]
21赵伟,邱隆伟,姜在兴,等.济阳坳陷民丰洼陷古近系沙河街组三段中亚段沉积相展布与演化[J].沉积学报,2011,29(2):255-267[Zhao Wei,Qiu Longwei,Jiang Zaixing,et al.Distributionand evolution of sedimentary facies of the Middle of the Third Memberof Shahejie Formation,Paleogene system in Minfeng Sub-sag,JiyangDepression[J].Acta Sedimentologica Sinica,2011,29(2):255-267]
22刘震,曾宪斌,张万选.构造掀斜对单断湖盆湖平面变化的影响[J].沉积学报,1997,15(4):64-67[Liu Zhen,Zeng Xianbin,Zhang Wanxuan.Profile in sediments in estuaries and its applicationto sedimentology[J].Acta Sedimentologica Sinica,1997,15(4):64-67]
23胡受权.泌阳断陷陡坡带陆相层序发育的可容空间图解探讨[J].高校地质学报,1998,4(3):85-9423[Hu Shouquan.On ac-commodation diagram of developing mechanics of terrigenous sequencein the steep slope zone of Biyang fault-depression[J].GeologicalJournal of China Universities,1998,4(3):85-94]
24杨伟利,姜在兴,操应长,等.陆相断陷盆地可容空间转换特征[J].沉积学报,2009,27(2):299-305[Yang Weili,Jiang Zaix-ing,Cao Yingchang,et al.The accommodation transition in faultedlake basin[J].Acta Sedimentologica Sinica,2009,27(2):299-305]
①操应长,乐友喜,王健,等.三围西南凹陷陌古近系高精度层序地层解释、沉积相研究与储集砂体预测.中国石油大学(华东),2009
①童亨茂,刘震,孟令箭,等.三围西南凹陷断层系统分析及其与油气成藏关系研究.中国石油大学(北京),2006
2刘晖,操应长,袁静,等.胜坨地区沙四上亚段砂砾岩类型及储层特征[J].西南石油大学学报:自然科学版,2010,32(5):9-15[Liu Hui,Cao Yingchang,Yuan Jing,et al.The types and reservoircharacteristics of glutenite in the upper Es4 member of Shengtuo area[J].Journal of Southwest Petroleum University:Science&Technolo-gy Edition,2010,32(5):9-15]
3谢风猛,武法东,陈建渝,等.渤海湾盆地滨南油田砂砾岩扇体空间展布与成藏规律[J].石油实验地质,2002,24(4):334-338[XieFengmeng,Wu Fadong,Chen Jianyu,et al.Spatial distribution andpool-forming rules of sandy-conglomeratic fans in Binnan Oilfield,theBohaiwan Basin[J].Petroleum Geology&Experiment,2002,24(4):334-338]
4加东辉,周心怀,李建平,等.辽中凹陷中北段重力流发育模式与控制因素[J].成都理工大学学报:自然科学版,2010,37(1):69-74[Jia Donghui,Zhou Xinhuai,Li Jianping,et al.Depositional modeland controlling factors of sedimentary gravity flows in the central-north-ern Liaozhong sag,China[J].Journal of Chengdu University of Tech-nology:Science&Technology Edition,2010,37(1):69-74]
5林松辉,王华,王兴谋,等.断陷盆地陡坡带砂砾岩扇体地震反射特征——以东营凹陷为例[J].地质科技情报,2005,24(4):55-59[Lin Songhui,Wang Hua,Wang Xingmou,et al.Seismic reflectionfeature of grailnite fan in abrupt slope zone of rift-subsidence lake ba-sin:a case in Dongying Depression[J].Geological Science and Tech-nology Information,2005,24(4):55-59]
6姜在兴,王卫红,杨伟利.21世纪中国石油勘探战略展望[J].石油大学学报:自然科学版,2002,26(2):1-10[Jiang Zaixing,Wang Weihong,Yang Weili.Petroleum exploration strategy of China inthe twenty first century[J].Journal of the University of Petroleum,China:Edition of Natural Science,2002,26(2):1-10]
7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,2009,27(3):1-12[Xi Minhong,Yu Xuebing,Huang Jianjun.Paleogene stratigraphic sequence andsedimentary feature in the west of Weixinan Depression[J].OffshoreOil,2007,27(3):1-21]
8刘震,谭卓,蔡东升,等.北部湾盆地涠西南凹陷流沙港组岩性圈闭形成条件[J].现代地质,2008,22(2):239-246[Liu Zhen,Tan Zhuo,Cai Dongsheng,et al.Analysis on forming conditions of li-thologic trap in Liushagang Formation,Weixinan Depression of BBWBasin[J].Geoscience,2008,22(2):239-246]
9李茂.涠洲11-4N油田流一段强非均质储层评价及开发策略[D].山东东营:中国石油大学,2010[Li Mao.Evaluation and Develop-ment Tactics of Strong Heterogeneity Reservoir in L1 Segment ofWeizhou 11-4N Oil Field[D].Dongying Shandong:China Universityof Petroleum(East China),2010]
10郭飞飞,郭小文,孙建峰,等.北部湾盆地涠西南凹陷C洼烃源岩热史及成熟史模拟[J].海洋地质与第四纪地质,2010,30(2):87-93[Guo Feifei,Guo Xiaowen,Sun Jianfeng,et al.Sourcerock thermal and maturity history modeling in C sag of the WeixinanDepression,BBW Basin[J].Marine Geology&Quaternary Geology,2010,30(2):87-93]
11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.Fluxoturbidite distribution for Paleogene Liu-1 Interval West deltafront,Wei South-west Depression[J].Oil Geophysical Prospecting,2010,45(6):879-884]
12江文荣.涠洲11-4N油田始新统流沙港组一段油藏精细描述[D].成都:西南石油大学,2008[Jiang Wenrong.Fine ReservoirDescription in L1 Segment of Eocene in Weizhou 11-4N Oilfield[D].Chengdu:Southwest Petroleum University,2008]
13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,LiJunliang.Subtle hydrocarbon reservoirs in Liu-1Member of the Weixi’nan Sag,Beibuwan Basin,China[J].Petroleum Exploration andDevelopment,2010,37(5):552-560]
14孙文钊,王传雷,杨希滨.北部湾盆地涠西南凹陷始新统隐蔽油气藏类型及勘探方向[J].天然气地球科学,2007,18(1):84-88[Sun Wenzhao,Wang Chuanlei,Yang Xibin.Types and favorableexploration areas of Eocene subtle traps in Weixinan Sag,BBW Basin[J].Natural Gas Geoscience,2007,18(1):84-88]
15周廷全,鲜本忠,林会喜,等.车镇凹陷陡坡带古近系湖底扇沉积规律及储层特征[J].油气地质与采收率,2007,14(2):23-27[Zhou Tingquan,Xian Benzhong,Lin Huixi,et al.Sedimentaryrules and reservoir characteristics of sublacustrine fan in Paleogene insteep slope Chezhen Sag[J].Petroleum Geology and Recovery Effi-ciency,2007,14(2):23-27]
16于兴河.碎屑岩系油气储层沉积学[M].北京:石油工业出版社,2008[Yu Xinghe.Sedimentology of Oil and Gas Reservoir inClastic Rock Series[M].Beijing:Petroleum Industry Press,2008]
17张军华,周振晓,谭明友,等.地震切片解释中的几个理论问题[J].石油地球物理勘探,2007,42(3):348-352[Zhang Junhua,Zhou Zhenxiao,Tan Mingyou,et al.Several theoretical issues aboutinterpretation of seismic slices[J].Oil Geophysical Prospecting,2007,42(3):348-352]
18朱筱敏,刘长利,张义娜,等.地震沉积学在陆相湖盆三角洲砂体预测中的应用[J].沉积学报,2009,27(5):915-921[Zhu Xi-aomin,Liu Changli,Zhang Yina,et al.On seismic sedimentology oflacustrine deltaic depositional systems[J].Acta Sedimentologica Sini-ca,2009,27(5):915-921]
19林正良,王华,李红敬,等.地震沉积学研究现状及进展综述[J].地质科技情报,2009,28(5):131-137[Lin Zhengliang,Wang Hua,Li Hongjing,et al.Current status and progress of seismicsedimentology[J].Geological Science and Technology Information,2009,28(5):131-137]
20孟令箭,童亨茂,蔡东升,等.北部湾盆地涠西南凹陷断裂系统成因的砂箱实验研究及启示[J].高校地质学报,2009,15(2):246-255[Meng Lingjian,Tong Hengmao,et al.Sandbox modellingon genetic mechanism of fault system in Weixinan Depression of theBeibu-gulf Basin and its inspiration[J].Geological Journal of ChinaUniversities,2009,15(2):246-255]
21赵伟,邱隆伟,姜在兴,等.济阳坳陷民丰洼陷古近系沙河街组三段中亚段沉积相展布与演化[J].沉积学报,2011,29(2):255-267[Zhao Wei,Qiu Longwei,Jiang Zaixing,et al.Distributionand evolution of sedimentary facies of the Middle of the Third Memberof Shahejie Formation,Paleogene system in Minfeng Sub-sag,JiyangDepression[J].Acta Sedimentologica Sinica,2011,29(2):255-267]
22刘震,曾宪斌,张万选.构造掀斜对单断湖盆湖平面变化的影响[J].沉积学报,1997,15(4):64-67[Liu Zhen,Zeng Xianbin,Zhang Wanxuan.Profile in sediments in estuaries and its applicationto sedimentology[J].Acta Sedimentologica Sinica,1997,15(4):64-67]
23胡受权.泌阳断陷陡坡带陆相层序发育的可容空间图解探讨[J].高校地质学报,1998,4(3):85-9423[Hu Shouquan.On ac-commodation diagram of developing mechanics of terrigenous sequencein the steep slope zone of Biyang fault-depression[J].GeologicalJournal of China Universities,1998,4(3):85-94]
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