东营凹陷北带古冲沟古近系多物源沉积模式
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摘要
利用地震反射结构、碎屑组分以及聚类分析等方法,提出东营凹陷北部陡坡带东部Y920古冲沟沙河街组沙四上亚段多物源叠加模式。研究结果表明:沙四上亚段沉积时期,Y920冲沟呈西陡东缓的不对称箕状构造形态。地震相呈东西分带的特点,冲沟西部发育楔形反射、东部发育前积反射、中部发育透镜状反射。冲沟内砂岩充填物的碎屑矿物组成在平面上具有明显的差异性,冲沟西部砂岩的石英含量低、岩屑含量高,岩屑以火成岩岩屑为主;冲沟东部,砂岩的长石和岩屑含量均较高,岩屑以变质岩岩屑为主;中部长石和石英含量较高,岩屑含量较低,含有较多的灰岩岩屑。Y920古冲沟存在3个方向的物源,分别为自北向南、沿冲沟长轴方向的北部物源以及来自冲沟西部和东部的短轴、侧向物源。冲沟西部发育近岸水下扇沉积,东部扇体以扇三角洲为主。
Based on seismic reflections,detrital composition analysis and cluster analysis,a multi-provenance depositional model of the Upper Fourth Member of the Shahejie Formation was proposed about the paleo-valley sedimentation controlled by well Y920 in the east of the northern abrupt slope belt in Dongying depression.The result shows that the paleogeomorphology of the Y920 gully develops asymmetrically as being abrupt in the west yet gentle in the east during this period.The seismic facies can be divided into two types: the west of the gully is dominated by the wedge-shape reflections,while the east is dominated by progradational reflections.And these two types are separated by the lens-shape reflections in the middle.The detrital composition planar distribution of the sand filling of the gully varies greatly: the west has a low content of quartz and a high content of rock fragment mainly in the type of volcanic;while the east has a relatively high abundance in both the feldspar and the rock fragment mainly in the type of metamorphic detritus;and in the central part the proportions of feldspar and quartz are overwhelming yet the content of detritus mainly in the type of limestone is low.There are three provenances for the Y920 gully including the northern one which provides sediments southward along the long axis and the western and the eastern ones on either side of the gully along the short axis.Thus,the nearshore subaqueous fan and fan delta mainly develop on the west and the east sides respectively.
Based on seismic reflections,detrital composition analysis and cluster analysis,a multi-provenance depositional model of the Upper Fourth Member of the Shahejie Formation was proposed about the paleo-valley sedimentation controlled by well Y920 in the east of the northern abrupt slope belt in Dongying depression.The result shows that the paleogeomorphology of the Y920 gully develops asymmetrically as being abrupt in the west yet gentle in the east during this period.The seismic facies can be divided into two types: the west of the gully is dominated by the wedge-shape reflections,while the east is dominated by progradational reflections.And these two types are separated by the lens-shape reflections in the middle.The detrital composition planar distribution of the sand filling of the gully varies greatly: the west has a low content of quartz and a high content of rock fragment mainly in the type of volcanic;while the east has a relatively high abundance in both the feldspar and the rock fragment mainly in the type of metamorphic detritus;and in the central part the proportions of feldspar and quartz are overwhelming yet the content of detritus mainly in the type of limestone is low.There are three provenances for the Y920 gully including the northern one which provides sediments southward along the long axis and the western and the eastern ones on either side of the gully along the short axis.Thus,the nearshore subaqueous fan and fan delta mainly develop on the west and the east sides respectively.
引文
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[8]高祥成,钟建华,雷敏,等.东营凹陷北部陡坡带深层砂砾岩体沉积特征及控制因素:以丰深1地区为例[J].石油地质与工程,2008,22(1):5-8.GAO Xiang-cheng,ZHONG Jian-hua,LEI Min,et al.Sedimentation feature and controlling factors of the deep glutenite fans in the northern steep slope,Dongying sag:TakingWell Fengshen-1area as an example[J].Petroleum Geology and Engineering,2008,22(1):5-8.
[9]纪友亮,张世奇.陆相断陷湖盆层序地层学[M].北京:石油工业出版社,1996:100-121.JI You-liang,ZHANG Shi-qi.Sequence stratigraphic models of the fault depression lake basin[M].Beijing:Petroleum Indystry Press,1996:100-121.
[10]鲜本忠,王永诗,周廷全,等.断陷湖盆陡坡带砂砾岩体分布规律及控制因素:以渤海湾盆地济阳坳陷车镇凹陷为例[J].石油勘探与开发,2007,34(4):50-57.XIAN Ben-zhong,WANG Yong-shi,ZHOU Ting-quan,et al.Distribution and controlling factors of glutinite bodies in the actic region of a rift basin:An example from Chezhen Sag,Bohai Bay Basin[J].Petroleum Exploration and Development,2007,34(4):50-57.
[11]鄢继华,陈世悦,姜在兴.东营凹陷北部陡坡带近岸水下扇沉积特征[J].石油大学学报:自然科学版,2005,29(1):12-16.YAN Ji-hua,CHEN Shi-yue,JIANG Zai-xing.Sedimentary characteristics of nearshore subaqueous fans in steep slope of Dongying depression[J].Journal of the University of Petroleum,China,2005,29(1):12-16.
[12]张金亮,张鑫.胜坨地区沙河街组沙四上亚段砂砾岩体沉积相与油气分布[J].沉积学报,2008,26(3):361-368.ZHANG Jin-liang,ZHANG Xin.The glutenite sedimentary facies and hydrocarbon distribution in the upper fourth member of Shahejie formation in shengtuo area[J].Acta Sedimentologica Sinica,2008,26(3):361-368.
[13]Bowen D W,Weimer P.Regional sequence stratigraphic setting and reservoir geology of Morrow incised-valley sandstones(lower Pennsylvanian),eastern Colorado and western Kansas[J].AAPG Bulletin,2003,87(7):781-815.
[14]Bowen D W,Weimer P.Reservoir geology of Nicholas and Liverpool Cemetery fields(lower Pennsylvanian),Stanton County,Kansas,and their significance to the regional interpretation of the Morrow Formation incised-valley-fill systems in eastern Colorado and western Kansas[J].AAPG Bulletin,2004,88(1):47-70.
[15]Deibert J E,Phyllis A C.Sedimentologic and tectonic origin of an incised-valley-fill sequence along an extensional marginal-lacustrine system in the Basin and Range province,United States:Implications for predictive models of the location of incised valleys[J].AAPG Bulletin,2006,90(2):209-235.
[2]姜在兴,杨伟利,于雯泉,等.湖缘峡谷及其含油性[J].地学前缘,2005,12(3):186-194.JIANG Zai-xing,YANG Wei-li,YU Wen-quan,et al.The lake-margin canyon and its hydrocarbon potential[J].Earth Science Frontiers,2005,12(3):186-194.
[3]张维冈,刘怀山.东营北部凸起带古冲沟储层分布规律研究[J].青岛海洋大学学报,2002,32(4):603-607.ZHANG Wei-gang,LIU Huai-shan.Studies on reservoir prediction of platfood in the paleogully in the north of dongying[J].Journal of Ocean University of Qingdao,2002,32(4):603-607.
[4]张春生,赖志云,李春光,等.永安镇油田沙四段冲积扇扇三角洲沉积[J].地球科学:中国地质大学学报,1995,20(1):95-100.ZHANG Chun-sheng,LAI Zhi-yun,LI Chun-guang,et al.Alluvial fan-fan delte deposits of Sha4member in Yong'anzhen oil field[J].Earth Science:Journal of China University of Geosciences,1995,20(1):95-100.
[5]杨剑萍,石德文.东营凹陷北部永921地区渐新世沙三段和沙四段扇三角洲沉积[J].中国石油大学学报:自然科学版,2000,24(1):10-17.YANG Jian-ping,SHI De-wen.Fan delta deposits of Sha3and Sha4members at Oligocene Shahejie Formation at Yong921area in the north of Dongying depression[J].Journal of China University of Petroleum:Edition of Natural Science,2000,24(1):10-17.
[6]王蛟,姜在兴,操应长.山东东营凹陷永921地区沙四上亚段扇三角洲沉积与油气[J].吉林大学学报:地球科学版,2005,35(6):725-732.WANG Jiao,JIANG Zai-xing,CAO Ying-chang.Fan delta deposits and relation to hydrocarbon of upper Es4at Yong921area in Dongying depression[J].Journal of Jilin University:Earth Science Edition,2005,35(6):725-732.
[7]孔凡仙.东营凹陷北带砂砾岩扇体勘探技术与实践[J].石油学报,2000,21(5):27-31.KONG Fan-xian.Exploration technique and practice of sandy-conglomeratic fans in the northern part of Dongying depression[J].Acta Petrolei Sinica,2000,21(5):27-31.
[8]高祥成,钟建华,雷敏,等.东营凹陷北部陡坡带深层砂砾岩体沉积特征及控制因素:以丰深1地区为例[J].石油地质与工程,2008,22(1):5-8.GAO Xiang-cheng,ZHONG Jian-hua,LEI Min,et al.Sedimentation feature and controlling factors of the deep glutenite fans in the northern steep slope,Dongying sag:TakingWell Fengshen-1area as an example[J].Petroleum Geology and Engineering,2008,22(1):5-8.
[9]纪友亮,张世奇.陆相断陷湖盆层序地层学[M].北京:石油工业出版社,1996:100-121.JI You-liang,ZHANG Shi-qi.Sequence stratigraphic models of the fault depression lake basin[M].Beijing:Petroleum Indystry Press,1996:100-121.
[10]鲜本忠,王永诗,周廷全,等.断陷湖盆陡坡带砂砾岩体分布规律及控制因素:以渤海湾盆地济阳坳陷车镇凹陷为例[J].石油勘探与开发,2007,34(4):50-57.XIAN Ben-zhong,WANG Yong-shi,ZHOU Ting-quan,et al.Distribution and controlling factors of glutinite bodies in the actic region of a rift basin:An example from Chezhen Sag,Bohai Bay Basin[J].Petroleum Exploration and Development,2007,34(4):50-57.
[11]鄢继华,陈世悦,姜在兴.东营凹陷北部陡坡带近岸水下扇沉积特征[J].石油大学学报:自然科学版,2005,29(1):12-16.YAN Ji-hua,CHEN Shi-yue,JIANG Zai-xing.Sedimentary characteristics of nearshore subaqueous fans in steep slope of Dongying depression[J].Journal of the University of Petroleum,China,2005,29(1):12-16.
[12]张金亮,张鑫.胜坨地区沙河街组沙四上亚段砂砾岩体沉积相与油气分布[J].沉积学报,2008,26(3):361-368.ZHANG Jin-liang,ZHANG Xin.The glutenite sedimentary facies and hydrocarbon distribution in the upper fourth member of Shahejie formation in shengtuo area[J].Acta Sedimentologica Sinica,2008,26(3):361-368.
[13]Bowen D W,Weimer P.Regional sequence stratigraphic setting and reservoir geology of Morrow incised-valley sandstones(lower Pennsylvanian),eastern Colorado and western Kansas[J].AAPG Bulletin,2003,87(7):781-815.
[14]Bowen D W,Weimer P.Reservoir geology of Nicholas and Liverpool Cemetery fields(lower Pennsylvanian),Stanton County,Kansas,and their significance to the regional interpretation of the Morrow Formation incised-valley-fill systems in eastern Colorado and western Kansas[J].AAPG Bulletin,2004,88(1):47-70.
[15]Deibert J E,Phyllis A C.Sedimentologic and tectonic origin of an incised-valley-fill sequence along an extensional marginal-lacustrine system in the Basin and Range province,United States:Implications for predictive models of the location of incised valleys[J].AAPG Bulletin,2006,90(2):209-235.
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