摘要
博兴洼陷在沙四段沉积时期是相对独立的断陷湖盆。应用高精度层序地层学原理,将沙四段划分为1个二级层序和2个三级层序。在三级层序SI中识别出5个四级层序,下部3个四级层序构成低位体系域,上部2个四级层序分别对应于水进体系域和高位体系域。三级层序SI以砂质滩坝沉积为特色,可形成于沿岸、湖湾或生长性较弱的断裂下降盘。以四级层序为基本单元揭示了沉积体系在空间的展布和演化规律。由于断陷盆地不同部位的构造、古地貌不同,洼陷不同部位的层序构造样式有明显的区别。分析结果表明,沉积层序受到洼陷古地理、古构造和古气候共同制约的基准面及其演化的控制,沉积层序内沉积体系的发育具有复杂性和多样性。
Boxing Depression is an Eocene lacustrine rifted basin.Based on high-resolution sequence stratigraphy,Sha4 member can be divided into 1 second-order sequence and 2 third-order sequences.There are 5 fourth-order sequences can be recognized in third-order sequence SⅠ.LST usually formed by 3 fourth -order sequences,but HST and TST formed by 1 fourth-order sequence,respectively.Depositional systems in third-order sequence SⅠmainly consisted of sandy beach bar,which developed along the beach,arm of lake and hanging-wall of low-growth faults.Spatial distribution and evolution of depositional systems were revealed based on the fourth-order isochronal sequence stratigraphic framework.The study indicated that depositional sequences were controlled obviously by the base-level and its evolution,which controlled by paleogeology,paleostructure,and paleoclimate.And the development of depositional systems were characterized by complexity and diversity.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2009年第3期22-25,共4页
Petroleum Geology and Recovery Efficiency
基金
国家重点基础研究发展规划"973"项目"中国典型叠合盆地层序地层分析与构造古地理"(G1999043304)
关键词
高精度层序地层学
滩坝
沉积体系
控制因素
博兴洼陷
high-resolution sequence stratigraphy
beach bar
depositional system
control factor
Boxing Depression
Bohai Bay Basin
