吉林大情字井地区三角洲体系高分辨率层序地层模式研究  

HIGH-RESOLUTION SEQUENCE STRATIGRAPHY MODEL OF THE DELTA SYSTEM IN DAQINGZIJING AREA,JILIN PROVINCE

作　　者：李存磊[1] 谢俊[1] 陈盼盼[1] 范忠礼[1] 孙中强[1] 

机构地区：[1]山东科技大学地质科学与工程学院,山东青岛266590

出　　处：《地层学杂志》2014年第3期355-362,共8页Journal of Stratigraphy

基　　金：国家自然科学基金面上项目(No.41172109);山东省自然科学基金面上项目(ZR2011DM009);山东省博士后创新项目专项资金(201306069)资助

摘　　要：大情字井地区青山口组第三段沉积时期发育陆相水退三角洲体系,由于不同相带层序类型的差异,造成三角洲平原与三角洲前缘测井曲线形态差异极大,以测井曲线标志层分析为主的小层对比较难实现全区对比的统一。岩芯分析表明,三角洲平原由于可容纳空间最低,沉积物以过路冲刷作用为主,受基准面升降的控制作用不明显,形成以上升半旋回为主的短期旋回组合;三角洲前缘受基准面升降的控制作用明显,在基准面下降期间形成相对完整的进积层序。通过分析不同相带层序组合与基准面的变化关系,总结出4种不同级次旋回的组合类型,以此确定不同相带不同级次旋回的对比关系,建立划分方案,实现旋回对比。研究认为,不同相带可容纳空间的不同导致研究区不同区域基准面旋回样式的差异是造成旋回对比困难的主要原因,通过不同相带的环境—沉积分析,总结不同相带旋回组合样式,以此确定对比关系是不同相带旋回进行对比的有效手段。The transgressive delta is the main sedimentary system in the 3rd Member of Qingshankou Formation,Daqingzijing area.The diversity of depositional sequences leads variable logging curves in delta plain and delta front subfacies.As a result,stratigraphic correlation based on logging data is difficult.Due to limited accommodation space and sediment bypass in the delta plain,base level changes have weak control on the development of sedimentary sequences,which are dominated by the transgression half-cycles.In contrast,base level changes have greater control on the development of sedimentary sequences in delta front facies,where sequences consist of transgression-regression full-cycles.Four types of depositional cycles are distinguished based on the relationship of facies associations.They can be used to carry out cyclostratigraphic correlations in the study area.The research shows that the difference in accommodation space among different facies presents a significant challenge in cyclostratigraphic correlaitons.But careful analysis of sedimentary facies can help to improve the cyclostratigraphic correlation among different facies.

关 键 词：高分辨率层序地层 三角洲体系 基准面旋回 层序地层模式 青山口组 白垩系 大情字井油田 吉林 

分 类 号：P539.2[天文地球—古生物学与地层学] P534.53[天文地球—地质学]