穆尼盆地第四纪深水弯曲水道:沉积构型、成因及沉积过程
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摘要
深水水道是陆坡沉积的重要组成单元,深水水道储层受到广泛关注。基于高分辨率三维地震资料,利用地震属性、分频技术等研究穆尼盆地第四纪深水弯曲水道的沉积构型、成因及沉积过程,主要取得以下3个方面的成果:(1)建立了深水弯曲水道沉积构型模式。弯曲深水水道由水道和堤岸组成。堤岸脊将堤岸分成内堤岸和外堤岸两部分。水道由底部粗粒滞留沉积、深海泥质披覆沉积以及滑块组成。(2)深水水道早期为低弯曲水道,后期逐渐演化为高弯曲水道。(3)建立了深水弯曲水道沉积的岩相模式,深水弯曲水道由垂向加积水道和侧向迁移水道组成。顺重力流方向,侧向迁移带,内弯带以沉积作用为主,外弯带以侵蚀作用为主。垂向加积带,水道底部粗粒滞留沉积往往表现为垂向加积特征。深水弯曲水道岩相模式的建立对深水浊积水道储层准确预测具有重要的理论指导意义。
Submarine channels are important components of continental slope.Great attentions are attached to deep-water channel reservoirs.Based on the high resolution 3-D seismic data,seismic attribute and SpecDecomp are used to study the architecture,genesis and process of the Quaternary submarine channels in Muni basin.There are three main conclusions:(1)Model of sedimentary architecture in sinuous submarine channels are built in this paper.Submarine channels are composed of channel and levee.Channels can be divided into two parts by levee crest: inner levee and outer levee.Channel fills are consisted of the coarse lag,hemipelagic mud drape deposits and slide.(2)The evolution process of submarine channel has been summaried.In the early stage,submarine channel is characterized by low sinuous channel,and in the later stage,by high sinuousity.(3)Lithofacies models of sinuous submarine channel are established in this paper.Sinuous submarine channels are composed of migration channel and aggradation channel.Along gravity-flow channel,the inner concave is mainly sedimentation while the outer gives priority to erosion process.Coarse channel-lag deposits are characterized by aggradation.Lithofacies model of sinuous submarine channel is an important theoretical significant for accurate reservoir prediction of deepwater turbidity.
Submarine channels are important components of continental slope.Great attentions are attached to deep-water channel reservoirs.Based on the high resolution 3-D seismic data,seismic attribute and SpecDecomp are used to study the architecture,genesis and process of the Quaternary submarine channels in Muni basin.There are three main conclusions:(1)Model of sedimentary architecture in sinuous submarine channels are built in this paper.Submarine channels are composed of channel and levee.Channels can be divided into two parts by levee crest: inner levee and outer levee.Channel fills are consisted of the coarse lag,hemipelagic mud drape deposits and slide.(2)The evolution process of submarine channel has been summaried.In the early stage,submarine channel is characterized by low sinuous channel,and in the later stage,by high sinuousity.(3)Lithofacies models of sinuous submarine channel are established in this paper.Sinuous submarine channels are composed of migration channel and aggradation channel.Along gravity-flow channel,the inner concave is mainly sedimentation while the outer gives priority to erosion process.Coarse channel-lag deposits are characterized by aggradation.Lithofacies model of sinuous submarine channel is an important theoretical significant for accurate reservoir prediction of deepwater turbidity.
引文
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[13]Dailly P,LowryP,GohK,etal.ExplorationanddevelopmentofCeiba Field,Rio Muni Basin,Southern Equatorial Guinea[J].The Leading Edge,2002,21(11):140-147.
[14]吴时国,龚跃华,米立军,等.南海北部深水盆地油气渗漏系统及天然气水合物成藏研究[J].现代地质,2010,24(3):433-440.
[15]Mutti E,Normark W R.An integrated approach to the study ofturbidite systems[M]//Weimer P,Link M H.Seismic Faciesand Sedimentary Processes of Submarine Fans and Turbidite Sys-tems[M].New York:Springer-Verlag,1991:75-106.
[16]Reading H G,RichardsM.Turbidite systemsin deep-water basinmargins classified by grain size and feeder system[J].AAPGBulletin,1994,78(5):792-822.
[17]Richards M,Bowman M,Reading H.Submarine-fan systems I:characterization and stratigraphic prediction[J].Marine and Pe-troleum Geology,1998,15(7):687-717.
[18]Richards M,Bowman M.Submarine fansand related depositionalsystems II:variability in reservoir architecture and wireline logcharacter[J].Marine and Petroleum Geology,1998,15(8):821-839.
[19]Saller A H,Noah J T,Ruzuar A P,et al.Linked lowstand deltato basin-floor deposition,offshore Indonesia:An analog for deep-water systems[J].AAPG Bulletin,2004,88(1):21-46.
[2]林畅松,杨起,李思田,等.贺兰奥拉槽早古生代深水重力流体系的沉积特征和充填样式[J].现代地质,1991,5(3):252-262.
[3]龚建明,张莉,陈建文,等.ODP 204航次天然气水合物的可能有利储层——浊积层[J].现代地质,2005,19(1):21-25.
[4]Wynn R B,Cronin B T,Peakall J.Sinuous deep-water chan-nels:Genesis,geometry and architecture[J].Marine and Petro-leum Geology,2007,24(6/9):341-387.
[5]Nigel E C,Alan C,Robert J C,et al.3-D seismic geomorpholo-gy of a deepwater slope channel system:The Sequoia Field,Off-shore West Nile Delta,Egypt[J].AAPG Bulletin,2009,93(8):1063-1086.
[6]Nakajima T,Peakall J,McCaffrey W D,et al.Outer-bank bars:A new intra-channel architectural element within sinuous subma-rine slope channels[J].Journal of Sedimentary Research,2009,79(12):872-886.
[7]袁圣强,曹锋,吴时国,等.南海北部陆坡深水曲流水道的识别及成因[J].沉积学报,2010,28(1):68-74.
[8]吴时国,秦蕴珊.南海北部陆坡深水沉积体系研究[J].沉积学报,2009,27(5):922-930.
[9]Babonneau N,Savoye B,Cremer M,et al.Sedimentary architec-ture in meanders of a submarine channel:Detailed study of thepresent Congo turbidite channel(Zaiango Project)[J].Journalof Sedimentary Research,2010,80(10):852-866.
[10]吕彩丽,吴时国,袁圣强.深水水道沉积体系及地震识别特征研究[J].海洋科学集刊,2010,50:40-49.
[11]Hodgson D M,Celma C N D,Brunt R L,et al.Submarine slopedegradation and aggradation and the stratigraphic evolution ofchannel-levee systems[J].Journal of the Geological Society,2011,168(3):625-628.
[12]李磊,王英民,张莲美,等.尼日尔三角洲下陆坡限定性重力流沉积过程及响应[J].中国科学:D辑,2010,40(11):1591-1597.
[13]Dailly P,LowryP,GohK,etal.ExplorationanddevelopmentofCeiba Field,Rio Muni Basin,Southern Equatorial Guinea[J].The Leading Edge,2002,21(11):140-147.
[14]吴时国,龚跃华,米立军,等.南海北部深水盆地油气渗漏系统及天然气水合物成藏研究[J].现代地质,2010,24(3):433-440.
[15]Mutti E,Normark W R.An integrated approach to the study ofturbidite systems[M]//Weimer P,Link M H.Seismic Faciesand Sedimentary Processes of Submarine Fans and Turbidite Sys-tems[M].New York:Springer-Verlag,1991:75-106.
[16]Reading H G,RichardsM.Turbidite systemsin deep-water basinmargins classified by grain size and feeder system[J].AAPGBulletin,1994,78(5):792-822.
[17]Richards M,Bowman M,Reading H.Submarine-fan systems I:characterization and stratigraphic prediction[J].Marine and Pe-troleum Geology,1998,15(7):687-717.
[18]Richards M,Bowman M.Submarine fansand related depositionalsystems II:variability in reservoir architecture and wireline logcharacter[J].Marine and Petroleum Geology,1998,15(8):821-839.
[19]Saller A H,Noah J T,Ruzuar A P,et al.Linked lowstand deltato basin-floor deposition,offshore Indonesia:An analog for deep-water systems[J].AAPG Bulletin,2004,88(1):21-46.
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