南堡凹陷南部沙一段控砂模式

doi:10.13278/j.cnki.jjuese.201602104

摘要/Abstract

摘要：

南堡凹陷盆地内部构造特征复杂,砂体时空分布差异较大。为了明确砂体分布规律,首先对南部缓坡带构造-沉积背景进行研究和岩心相观察,识别了沙一段辫状河三角洲前缘砂体;进而通过对南部缓坡带层序地层格架的建立、沉积学研究和地震地质解释,发现沙一段砂体同时受到顺源和逆源两种同沉积断裂坡折带类型控制。其中,顺源坡折带控制了断槽物源通道的走向,逆源坡折带改变了水流的流向,阻止了砂体的运移。据此,建立了南堡凹陷南部缓坡带沙一段同沉积断裂的控砂模式,得出沙一段砂体具有"沙垒田凸起供砂,断槽物源通道输砂,逆源坡折带阻砂和同沉积洼槽带聚砂"的发育特点。

关键词: 南堡凹陷, 缓坡带, 沙一段, 断槽, 逆源坡折带, 控砂模式

Abstract:

The structural characteristic of Nanpu sag basin is complex, and the sandbody distribution varies in time and space. In order to determine the sandbody distribution pattern, the analysis of core facies with structural and sedimentary background in gentle slope zone was conducted to identify and interpret the braided delta front sandstone. According to the establishment of the sequence stratigraphy framework, sedimentology, and seismic geological interpretation, the distrution of sandbodies in Nanpu sag was controlled by two kinds of synsedimentary fault slope-break belts, including the source direction fault slope-break belts that controlled the sediment transport channel and the sedimentary enrichment space, and the reverse source fault slope-break belts that changed the flow direction and prevented lateral sediment transport. Thus, the sandbody development model of the First Member of Shahejie Formation in Paleogene in the south area of Nanpu sag is concluded and characterized as "Shaleitian salient providing the sands source, the groove and faulted trough transporting sands, the reversed slope-break zone and convex limiting the space, the distributary channel underwater in the braided delta front controlling the spatial distribution, and the slope-break zone determining the gathering of sands".

Key words: Nanpu sag, gentle slope zone, First Member of Shahejie Formation, faulted trough, reversed slope-break zone, sandbody development model

中图分类号:

P544.4

杜庆祥, 郭少斌, 曹中宏, 张晓龙, 李媛姝. 南堡凹陷南部沙一段控砂模式[J]. 吉林大学学报(地球科学版), 2016, 46(2): 348-357.

Du Qingxiang, Guo Shaobin, Cao Zhonghong, Zhang Xiaolong, Li Yuanshu. Sandbody Development Model of the First Member of Shahejie Formation in Paleogene in Southern Nanpu Sag[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(2): 348-357.

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