【作者】 孙小霞；

【导师】 李勇；

【作者基本信息】 成都理工大学 ， 第四纪地质学， 2007， 硕士

【摘要】 埕北地区位于渤海湾盆地黄骅坳陷东南部，紧邻埕宁隆起，以断阶式的缓坡带为其特征。以往前人对缓坡一侧的沉积地质特征研究较少，也没有对该地区缓坡型层序及沉积体系特征进行详细的研究；东营组作为湖盆抬升收缩期的沉积物，其层序及沉积体系特征又与以往研究较多的断陷扩张期的沉积特征有着明显的不同；并且该地区东营组研究也不能满足当前油气勘探的需要。鉴于此，本文选取了该地区东营组作为研究的关键层位，以陆相层序地层学理论为指导，开展该地区层序及沉积体系研究，以期能揭示埕北地区缓坡带抬升收缩期的层序及沉积特征。通过岩心相、测井相及地震相的分析，识别出研究区主要发育三角洲沉积体系、湖泊沉积体系及重力流沉积体系。以岩心、钻／测井、地震资料为基础，运用了陆相层序地层学的研究方法，根据地震、测井曲线上不同级别的层序界面的特征，将研究区目的层东营组划分为6个三级层序(SQ1、SQ2、SQ3、SQ4、SQ5、SQ6)和15个体系域，并以三级层序为基本单元建立了埕北地区东营组等时地层对比格架。在建立区域层序地层格架内，结合物源区分析、砂岩百分含量、地震相及地震属性的资料对埕北地区各层序沉积体系平面展布、纵向演化的特征做了深入而细致的分析，揭示其空间展布规律及纵向演化特征。在此基础上，建立了埕北地区缓坡带抬升收缩期的层序及沉积体系模式，指出湖盆抬升收缩期缓坡带主要发育曲流河三角洲—湖泊—重力流沉积体系组合；抬升收缩期缓坡层序特点表现为：各层序界面清楚，层序发育不完整，凹陷内部层序发育比较齐全，缓坡带之上缺失下部SQ1层序及上部SQ6层序；层序内部结构以低位体系域不发育，主要发育湖侵及高位体系域，高位体系域最为发育，是砂体发育的主要部位。更多还原

【Abstract】 Chengbei Zone is located in the southeast of Huanghua Depression of Bohai Bay Basin, in the neighborhood of Chengning Uplift. It is a special gentle slope caused by the fault. The research on the characteristics of sedimentary in gentle slope is rare. Dongying Formation which deposit in dormant rift of continental rift basin is different from the Shahejie Formation which deposit intense, constant rift of continental rift basin. Because of the reasons, the paper chooses Dongying Formation in Chengbei Zone to study. Guided by the theory of continental sequence stratigraphy, The aim was to reveal the sequence characteristics and its gentle slope depositional system evolution characteristics in Dongying Formation.Through the analyses of drilling core face, well log face and seismic face, the paper identifies 3 types of sedimentary system, namely delta sedimentary system, lake sedimentary system and gravity current sedimentary system.Based on the datas of drilling core, abundant 3-Dseismicdata, core data and logging data, utilizating the method of continental sequence stratigraphy, according to the characteristics of different levels of sequence boundaries, the paper divides Dongying Formation into 6 third-order sequences and 15 system tracts,On the basis of constitution of region sequence stratigraphic framework, referring to the analysis of paleo-provenances, the percent of sandstone, seismic face and seismic information, the paper analyses the distribution and evolution of sedimentary system of each sequence.constitutes the mode of sedimentary system of the gentle slope of Chengbei zone in Dongying Formation. It is a combination of meandering river delta sedimentary system lake-gravity sedimentary system and current sedimentary system. Through the sequence stratigraphy correlation, the following conclusions are drawn: Sequence boundaries are clear and sequences distribute discontinuously, there are no SQ1 or SQ6 on the top of the gentle slope, and all sequences distribute in the inner of the depression. In the sequence lowstand systems tract(LST) rarely occurs expanding systems tract(EST)Lack sands, while highstand systems tract (HST) develops thick sands, highstand systems tract (HST) is the main department of the sequence. The constitution of the mode will guide the exploration of the petroleum and gas of the zone.更多还原