摘要
泌阳断陷历经中生代小型拉分盆地、早第三纪断陷盆地和晚第三纪坳陷盆地等３个盆地原型的演化、叠合过程，形成了３个盆地充填序列及其所包含的３个构造层序。泌阳断陷下第三系（即构造层序Ⅱ）为湖盆沉积充填主体，其可划分为７个层序组，各层序组具特定的沉积体系配置关系。作为泌阳断陷油气勘探主要目的层段的下第三系核桃园组可进一步划分为１２个层序。其中，核三上段包括跨时分别为１．０８、１．４０、１．０２Ｍａ的３个陆相层序，由南往北呈现冲积扇—扇三角洲—湖泊—三角洲的沉积体系空间配置。泌阳断陷下第三系层序地层年代框架模式清晰地显示了断陷湖盆成盆演化史。
Biyang fault_depression experience three evolutional ph ase:Mesozoic pull apart, Paleogene rift , and Neogene downwarp basins. So it has in turn three basin_fill sequences and responding tectonic sequences, which we re specified by regional unconformity. Tectonic sequence Ⅱ(meaning Eogene) whic h is main sedimentary body in Biyang fault_depressed lacustrine basin can be cl assified into seven sequence sets,and every a sequence set has specified deposit ional system configuration.Hetaoyuan Formation (E h ), Eogene,a target of expl oration,can be further classified into twelve sequences in which the upper membe r of E h 3 includes three sequences which spanned 1.08, 1.40, 1.02Ma respect ively. From south to north, there lies fluvial fan fan delta lacustrine delta depositional system sequencely. The chorostratigraphic framework model of Biyan g fault_depression clearly shows basin formation and evolution history,and sedi ment_filling history,and distribution character of terrigenous sequence in time and space.
基金
"油气藏地质及开发工程"国家重点实验室开放基金
关键词
泌阳断陷
下第三系
陆相层序
沉积体系
层序地层
Biyang faultdepression Paleogene terrigenous sequence chorostratigraphic framework model depositional system
