陆相断陷盆地缓坡弯折带研究——以南阳凹陷为例  

Study of Gentle Slope-Break Zone in Continental Downfaulted Lacustrine Bas—An example of Nanyang seg

作　　者：程喆[1] 朱伟[1] 谭承军[1] 魏福军[1] 王正付[1] 

机构地区：[1]中国地质大学

出　　处：《新疆石油地质》2003年第6期527-529,共3页Xinjiang Petroleum Geology

摘　　要：陆相断陷湖盆缓坡区弯折带是指由同沉积控凹铲式断层长期活动产生的沉积斜坡带。南襄盆地南阳凹陷的研究表明,凹陷南部控凹铲状正断层在非平面上滑动造成凹陷北部的缓坡沉积坡折,制约了盆地可容纳空间的变化,控制了湖盆低位体系域和轴向高位湖三角洲砂体的分布范围。因此,通过建立弯折带内部层序地层格架,研究其特征、空间展布规律,确定各层序发育时的弯折带即低位滨线,再沿低位滨线内(或弯折带内)找寻大型低位扇体,建立低位砂岩储集体分布的预测模型,成为南阳凹陷隐蔽油气藏勘探突破的关键。The gentle slope-break zone in continental fault lacustrine basin is referred to as a depositional slope zone resulted from long-term activity of syndepositional listric faults.It is shown from study of Nanyang seg in Nanxiang basin that the non-plane gliding listric normal faults in southern Nanyang seg allow to shap ing gentle slope break zone in northern Nanyang seg,thus constraining the varia tion of holding spaces in this basin,controlling the distribution scope of low stand system tract and high stand lacustrine delta sands in axial orientation.This paper develops framework of in ner stratigraphic sequence of the slope-break zone,studies its features and spatial distribution,determines the low stand shore line of this zone developed in each se-quence,from which searches for large scale low stand fans,hence establishes the model for predicting distribution of the low stand sandstone reservoir.The result can be as guide for exploration of subtle oil-gas reservoir in Nanyang seg.

关 键 词：陆相盆地 断陷盆地 斜坡带 断层 沉积 层序地层学 三角洲 

分 类 号：P512.2[天文地球—地质学] P539.2