苏北断陷湖盆坡折带类型与戴南组隐蔽圈闭分布  

Slope break belts types in faulted lacustrine basin and subtle traps distribution in Dainan Formation in North Jiangsu

作　　者：张喜林 

机构地区：[1]中海油研究总院,北京100027

出　　处：《地质学刊》2013年第2期173-177,共5页Journal of Geology

摘　　要：对苏北盆地高邮凹陷上白垩统—第三系层序地层及戴南组沉积特征研究表明,断陷湖盆中发育多级多类断裂坡折带,它们控制着层序和沉积体系的发育以及砂体的加厚带。高邮凹陷中真1断层为陡坡盆缘坡折带,控制了盆地的边界并控制着戴南组粗碎屑扇体的发育;真2断层为陡坡盆内坡折带,控制了戴南组粗碎屑扇体的加厚带;汉留断层为缓坡盆内坡折带,控制了戴南组三角洲前缘砂体的加厚带和滑塌浊积扇的分布,同时也控制着低位体系域以及高位体系域三角洲前缘—岸线的分布。坡折带的发育受到盆地幕式构造运动的控制。沿盆内坡折带附近发育各类隐蔽圈闭,是断陷湖盆中油气勘探的重点地区。The studies on sequence stratigraphy of Tertiary and upper Cretaceous and sedimentary features in Dainan Formation in Gaoyou Sag, North Jiangsu Basin indicated that there were multi-level and multi-style slope-break belts in faulted lacustrine basins. These slope-break belts controlled the development of sequences, depositional systems and the distribution of sand bodies in Dainan Formation. The Z-1 fault in Gaoyou Sag was a steep-slope boundary fault, which controlled the development of coarse-grained fan depositional systems. The Z-2 fault was a steep-slope internal fault, which controlled sand bodies thickening zones of fan depositional sys- tems. Hanliu Fault was a gentle slope internal fault, which controlled the sand bodies thickening zones of delta front and the develop- ment of slumped turbitide fans, and also controlled the development of low stand system tracts and delta front-shoreline of high stand systems. The development of slope-break behs was controlled by periodic tectonic activity of the basin. The multi-style subtle traps de- veloped mainly near the internal faults, where the key promising oil and gas exploration activities were concentrated.

关 键 词：断陷盆地 断裂坡折带 隐蔽圈闭 层序地层 第三系 苏北盆地 江苏 

分 类 号：TE122[石油与天然气工程—油气勘探]