塔里木盆地三叠系隆后坳陷区层序地层特征  

Sequence stratigraphic characteristics of Triassic back-bulge zone in Tarim basin

作　　者：唐武[1,2] 王英民[1,2] 张雷 吴嘉鹏[1,2] 仲米虹[4] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中石油煤层气有限责任公司,北京100028 [4]中海石油气电集团有限责任公司技术研发中心,北京100027

出　　处：《中国矿业大学学报》2013年第6期1015-1024,共10页Journal of China University of Mining & Technology

基　　金："十一五"国家重大科技攻关项目(2008ZX05002)

摘　　要：为了揭示塔里木盆地三叠系隆后坳陷区层序地层特征,运用层序地层学和沉积学的原理和方法,通过地震、钻测井、岩心及露头等资料的综合分析,建立了三叠系层序地层格架,揭示了研究区三级层序结构特征,提出了隆后坳陷区三级层序发育的主控因素.结果表明:三叠系发育1个构造层序、3个层序组及5个三级层序.每个三级层序之间大多以厚层砂岩与泥岩突变接触,测井曲线上见明显的坎值,地震上削截特征清楚.在三级层序内部结构上底部以粗粒的三角洲相的砂岩、砂砾岩为主,顶部则为细粒的湖相泥质沉积,整体上表现为由粗变细的"二元"结构特征.前陆盆地的幕式构造活动对该层序结构的形成具有明显的控制作用,沉积物的供给则影响了层序内部沉积特征及叠置样式,而气候不仅影响沉积物的类型,还可以通过控制降雨和植被发育来引起湖平面的变化从而影响层序的发育.In order to reveal the sequence stratigraphic characteristics of Triassic hack-bulge zone in Tarim basin, the sequence stratigraphy and sedimentology was used to establish the se- quence stratigraphic framework and reveal the sequence stratigraphic characteristics by compre- hensive analysis of seismic data, well logging, cores and outcroppings. Besides, the study pro- posed the main controlling factors which influence third-order sequence development. The re- sults show that Triassic can be divided into one tectonic sequence, three sequence sets and five three-order sequences. The boundary between each three-order sequence is abruptly contacted by thick sandstone and mudstone, with obvious Scarp on logging and truncation on seismic pro- files respectively. Internally, the lower part of each three-order sequence mainly consists of coarse delta sandstone or sandy conglomerate, while the upper part is composed of fine muddy deposits. On the whole, it shows a dual structure that changes from coarsing one to fining one. The episodic tectonic activities of foreland basin predominantly control the formation of such sequence structure. Simultaneously, the sediment supply influences its internal sedimentary characteristics and superimposed styles. And the climate affects not only the types of deposits, but also the sequence development through dominating raining and vegetation to cause lake level change.

关 键 词：隆后坳陷 层序地层 控制因素 塔里木盆地 三叠系 

分 类 号：P539.2[天文地球—古生物学与地层学]