天然气地球科学

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松辽盆地长岭断陷龙凤山次凹下白垩统营城组物源与沉积相研究

袁静1,王尉1,朱建峰2,陈杏霞2,赵鸿皓1   

  1. 1.中国石油大学(华东)地球科学与技术学院,山东 青岛 266580;
    2.中国石化东北油气分公司,吉林 长春 130062
  • 收稿日期:2016-07-22 修回日期:2016-09-28 出版日期:2017-01-10 发布日期:2017-01-10
  • 作者简介:袁静(1972-),女,山东肥城人,教授,主要从事沉积学方面的研究. E-mail:drjyuan@163.com.
  • 基金资助:

    中国石化科技攻关项目“长岭地区断陷结构与充填特征研究”(编号:P14020)资助.

Research on provenance and sedimentary facies of Yingcheng Formationin Lower Cretaceous in Longfengshan Subsag,Changling Fault Depression,Songliao Basin

Yuan Jing1,Wang Wei1,Zhu Jian-feng2,Chen Xing-xia2,Zhao Hong-hao1   

  1. 1.School of Geosciences,China University of Petroleum,Qingdao 266580,China;
    2.Research Institute of Exploration and Development,Northeast Branch Corporation,SINOPEC,Changchun 130062,China
  • Received:2016-07-22 Revised:2016-09-28 Online:2017-01-10 Published:2017-01-10

摘要:

根据岩心、测井、地震、录井和薄片等资料,明确龙凤山次凹营城组的物源方向和沉积相类型,结合古地貌格局、同沉积断裂活动和古气候特征,对研究区沉积相时空演化进行了研究。研究结果表明,龙凤山次凹营城组沉积时期发育3个物源区,分别为西南部的变质岩物源区、南部的中基性岩浆岩物源区和东南部的岩浆岩物源区。研究区营城组沉积相类型以扇三角洲相和近岸水下扇相为主。扇三角洲相发育于湖盆洪水面和风暴浪基面之间的滨浅湖环境中,沿扇体展布方向从碎屑流、浊流沉积转化为牵引流沉积;近岸水下扇相发育于风暴浪基面之下的半深湖_深湖环境中,沿扇体展布方向从滑动滑塌逐渐转变为碎屑流和浊流沉积。研究区古地貌南高北低,坡度自西向东逐渐变陡,来自东南物源区的碎屑物质沿陡坡滑动滑塌快速入湖,形成近岸水下扇相;受同沉积断裂活动的影响,断裂两盘高差增大,在古地貌上形成向湖盆深处延伸的断槽,来自西南和南部物源区的碎屑物质受洪水搬运并沿断槽深凹处堆积,形成扇三角洲相;受古气候逐渐温热潮湿的影响,季节性洪水频发,导致研究区西南断槽带和南部断槽带发育进积为主的扇三角洲相砂砾岩体,东南陡坡带营Ⅴ砂组沉积时期开始发育进积为主的近岸水下扇相砂砾岩体,不同沉积相类型的砂砾岩体连片分布,紧邻东北洼陷带的半深湖_深湖相泥岩,形成研究区良好的源储对接关系。

关键词: 物源, 重力流, 沉积相, 营城组, 龙凤山次凹

Abstract:

Based on the data of cores,logging,seismic and thin-sections,the main source directions of study area in Longfengshan Subsag were confirmed through various evidences including assemblage type of heavy minerals,clastic composition and sandstone-conglomerate content.The sedimentary facies were studied by means of the data and methods of sediment structure,logging response and seismic reflection characteristics.Combined with pale-geomorphology background,synsedimentary faulting and paleoclimatic characteristics,the sedimentary spatiotemporal evolution and influencing factors were confirmed.The result shows that there are three main provenances of Yingcheng Formation,including southwest metamorphic rocks,south neutral-acidic magmatic rocks and southeast magmatic rocks.Based on the provenance systems,the Yingcheng Formation develops sedimentary facies of fan delta and nearshore subaqueous fan.Fan delta facies developed in the shore shallow lake environment which locates between flood-surface and storm wave base.Along the direction of fan-body expanding,debris flow and turbidity current transformed into traction current deposits.As a result of that,fan delta had the characteristic of gravity flow and traction current deposits.Nearshore subaqueous fan facies developed in the semi deep-deep lake which is under the storm wave base.Along the fan-body expanding direction,sliding and slumping gradually transformed into debris flow and turbidity current.The pale-geomorphology showed that the gradient steepened from west to east.Lots of detrital materials from the southeastern,sliding and slumping into lake along steep slope,developed nearshore subaqueous fan.Influenced by synsedimentary fault activity,materials from south and southwest transported by flood accumulated at the fault trough and formed fan delta.Based on the background of damp paleoclimate,seasonal flood provided the power for quick transportation of detrital materials.During the sedimentary period of Yingcheng Formation,sandy conglomerate bodies of fan delta mainly developed at southwest and southern fault trough area.Since the sedimentary period of fifth part of Yingcheng Formation,sandy conglomerate bodies of nearshore subaqueous fan started to deposit at southeast steep slope zone characterized by progradation.The continuous distribution of sandy conglomerate bodies of different facies and adjacent to the mudstone of the semi deep-deep lake facies in the northeast contribute to the favorable source-reservoir relationship.

Key words: Provenance, Gravity flow, Sedimentary facies, Yingcheng Formation, Longfengshan Subsag

中图分类号: 

  • TE121.3

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