陆相断陷盆地层序类型与隐蔽油气藏勘探——以南堡凹陷古近系为例  

Sequence Types and Subtle Trap Exploration in Continental Rift Basin: A Case Study of Lower Tertiary of the Nanpu Depression

作　　者：冯有良[1] 周海民[2] 李思田[3] 刘蕴华[2] 董月霞[2] 曹中宏[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油冀东油田勘探开发研究院,河北唐山063004 [3]中国地质大学资源学院,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2004年第5期603-608,共6页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学重点基金项目 (No .40 2 3 80 5 9)

摘　　要：以南堡凹陷高分辨率三维地震、测井和丰富的地质资料为基础 ,运用高精度层序地层分析方法 ,结合盆地构造和沉积充填特征的研究 ,在南堡凹陷古近系识别出了 1个超层序组、4个超层序、11个三级层序 ,在柳北扇三角洲体系可划分出 6个四级层序 .根据古构造坡折带控制层序类型和层序构成模式的思路 ,通过南堡凹陷古近系同沉积构造发育特征的分析 ,认为南堡凹陷古近系存在同沉积断裂坡折带和同沉积背斜挠曲坡折带 2种类型 ,由此决定了南堡凹陷古近系主要发育了同生断裂坡折型层序和同沉积背斜挠曲坡折型层序 ,建立了这 2种类型层序体系域构成模式 .其中同生断裂坡折型层序和同沉积背斜挠曲坡折型层序的低位域砂体及高位域砂体成藏条件优越、地震剖面易于识别 。Based on integrated analysis of high-resolution 3D seismic sections, log curves and abundant geological data, basin filling sequence in the Lower Tertiary Nanpu depression consists of one super sequence set, four super sequences, and eleven third-order sequences. The North Liuzhan fan delta system can be divided further into six fourth-order sequences. Two kinds of slope-breaks are developed in this basin, one is the syndepositional fault slope-break, the other is the syndepositional bend slope-break, which control clearly sequence types and stratigraphic models. Corresponding two kinds of sequence patterns are observed in Lower Tertiary Nanpu depression, that are the syndepositional fault slope-break and syndepositional bend slope-break sequences. The lowstand sand bodies and highstand sand bodies in the both sequences are favorable for hydrocarbon accumulation, and can be identified on seismic section easily, hence, they are taken as main targets for subtle trap exploration.

关 键 词：同沉积断裂 同沉积背斜挠曲 坡折型层序 低位域砂体 高位域砂体 隐蔽油气藏 古近系 南堡凹陷 

分 类 号：P618.13[天文地球—矿床学]