【摘要】 运用层序地层学的理论与方法,综合分析岩芯、测/录井以及地震等资料,结合区域构造演化,分析梨树断陷裂陷期沉积充填的层序结构特征及岩性地层圈闭的发育规律,将梨树断陷裂陷期的沉积充填划分为3个二级层序(I~III)和7个三级层序(SQ1~SQ7),建立其层序地层格架,阐明其内部沉积特征。依据构造特征、气候变迁、沉积物供给和层序发育等进行综合研究,表明坡折带控制了层序的发育及其体系域的构成,依据层序地层结构特征,将7个三级层序分为对称型、非对称A1型、非对称A2型和非对称B型4种类型。非对称A1型和对称型层序坡折带之下的低位体系域有利于形成断层—岩性圈闭,湖侵体系域在二级坡折带之间地区有利于形成岩性和地层圈闭,高位体系域易于形成地层圈闭。更多还原

【Abstract】 The sequence stratigraphy and lithologic-stratigraphic traps of the Lishu Rift were analyzed using a combination of drill core,seismic,and well log data.The depositional sequence of rifting stage in the Lishu Rift is divided into three second-order sequences(I-III)and seven third-order sequences(SQ1-SQ7).The sedimentary characteristics of each sequence are described.Based on a comprehensive study of structural characteristics,climate changes,sediment supplies,and sequence development,the results show that the slope-break belt controlled the development of sequence and the structure of system tracts.Based on structure characteristics,four types of sequences are recognized:a symmetrical type and three asymmetrical types(A1,A2,and B).For sequences of symmetrical type and asymmetrical type A1,lowstand system tracts are favorable structural-lithologic traps below the slope-break belt,transgressive system tracts are favorable lithologic and stratigraphic traps between secondary slope-break belts,and highstand system tracts are favorable stratigraphic traps.更多还原