摘要
综合钻测井、地震、古生物及地层倾角资料,在滩海西部古近系识别出区域性不整合面、地层侵蚀/超覆面及沉积旋回转换面3种类型9个层序界面,将其划分为8个三级层序。层序内部结构与充填演化具横向分带性与纵向继承性,西部斜坡带层序发育齐全,层序结构清晰,沉积物以粗碎屑占主体,为一套三角洲-辫状河三角洲沉积;海南洼陷带缺失SQ1层序,但层序厚度大,体系域发育齐全,以湖相细粒沉积为主;东部陡坡带早期发育近岸水下扇沉积,中晚期过渡为扇三角洲沉积。结合研究区钻井油气显示资料,探讨了构造演化与基准面旋回对有利储层分布的控制作用,认为不同构造演化时期有利储层发育于不同的层序内部单元。
According to drilling,logging,seismic and palaeophyte data in the west of Liaohe beach, three kinds of sequence boundaries(Regional unconformity,erosional surface/overlapping and shift surface of deposition)were identified.Nine isochronous sequence boundaries developed in the paleogene stratigraphy,which were divided into eight third-order sequences.The architecture,filling and evolution of the sequences were vertically succeeded and horizontally zoned.The sequences in western slope developed completely and the architecture of them is clear.There developed coarse clastic of delta and braided river delta.In Hainan sag,SQ1was not developed,but the sequences are thicker.The sediments there are fine particles of lacustrine facies.In actic region,there developed neritic subsea apron in early phase and fan delta in late period.Based on this,combining the hydrocarbon show of wells,the control action of structural evolution and base level cycle on the distribution of profitable reservoir were researched.In different period of structural evolution,profitable reservoir developed in different unit of sequences.
出处
《内蒙古石油化工》
CAS
2014年第4期118-122,共5页
Inner Mongolia Petrochemical Industry
关键词
古近系
辽河滩海
层序界面
有利储层
Paleogene
Liaohe beach
Sequence boundary
Profitable reservoir
