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机构地区:[1]东北石油大学地球科学学院,黑龙江大庆163318
出 处:《地质科学》2011年第4期973-982,共10页Chinese Journal of Geology(Scientia Geologica Sinica)
基 金:国家大型油气田及煤层气开发科技重大专项"中国大型气田形成条件;成藏机制与富集规律研究"(编号:2011ZX05007-002)资助
摘 要:本文在塔南凹陷地层重新划分对比和统一层位的基础上,利用塔南凹陷地震资料和钻/测井资料,并综合考虑构造运动演化特征、古生物资料及地球化学资料,将下白垩统划分为3个一级层序、4个二级层序和6个三级层序。各级层序中可识别出冲积扇体系、扇三角洲体系、辫状河三角洲、曲流河三角洲体系、浊积扇及湖泊等几种主要的沉积体系类型。冲积扇体系主要分布在层序SQ1,扇三角洲体系主要分布在层序SQ1~SQ2,辫状河三角洲体系主要分布在SQ3~SQ5,曲流河三角洲体系主要分布在SQ6,浊积扇体系主要分布在SQ4,湖泊体系在各三级层序内均有分布。各层序沉积体系的演化受控于凹陷构造演化过程中的古地貌构形。山间残留盆地小型湖盆充填过程形成层序SQ1;被动裂谷发育阶段宽缓的古地貌背景下沉积形成了层序SQ2和SQ3;主动裂谷盆地阶段初始断陷期,复式小型断陷湖盆沉积充填形成层序SQ4、断—坳转化期的广盆深水环境下沉积形成了层序SQ5和SQ6。Based on stratigraphic redivision and recorrelation of Tanan depression,its lower cretaceous can be divided into 3 firstorder sequences, 4 secondorder sequences and 6 thirdorder sequences according to seismic data,drilling data,logging data,paleontological data,geochemical data,and tectonic evolution characteristics.There are 6 main sedimentary systems in all sequences,such as alluvial system,fan delta system,braided river delta system,meandering river delta system,turbidite fan system and lacustrine system.Alluvial system is now found primarily in SQ1,whereas fan delta system primarily in SQ1 to SQ2,braided river delta system primarily in SQ3~SQ5,meandering river delta system primarily in SQ6,turbidite fan system primarily in SQ4 and lacustrine system in all 3 firstorder sequences.Sedimentary systems evolution is under control by palaeogeomorphology formed during Tanan depression tectonic evolution.Small lake basins filling at intermountain remnant basin stage formed SQ1,and SQ2~SQ3 formed in broad and gentle palaeogeomorphology environment at passive rift stage,SQ4 formed under complex small faulted lake basins background at initial active rift stage,whereas SQ5~SQ6 formed in wide basin with deepwater environment at stage of faulted basin transform to depression.
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