苏北盆地高邮凹陷深凹带古近系戴南组软沉积物变形构造及沉积模式研究  

Depositional Model and Characteristic of Soft-sediment Deformation Structures of the Paleogene Dainan Formation in Gaoyou Sag,North Jiangsu Basin

作　　者：刘金华[1] 吴立峰[1] 乔力[1] 孙秀会[1] 孙晓庆[1] 

机构地区：[1]江苏油田地质科学研究院,江苏扬州225012

出　　处：《地质论评》2014年第5期1019-1025,共7页Geological Review

摘　　要：软沉积物变形构造又称准同生变形构造,其发育特征、分布规律以及沉积模式等的研究对油气储层研究具有重要意义。研究区多个油田的岩芯观察中发现了同生微断层、液化岩脉、液化扭曲变形、砂枕构造、自碎角砾岩等多种软沉积物变形构造,并分析了形成各种软沉积物变形构造的不同应力环境和特征。通过软沉积物变形构造平面分布规律分析,认为软沉积物变形构造随着边界断层真2断层和汉留断层断层面倾角变大出现的频率越高,发育程度越强烈,因而研究区软沉积物变形构造的发育频率与高邮凹陷深凹带的边界断层的坡度有关,变形构造的产生和分布受到古地形的控制。并且该类变形构造在一定程度上改变了原始储层的物性和连通性。通过参考国内外的软沉积物变形构造成因模式,提出了研究区的软沉积物变形构造沉积模式,研究区软沉积物变形构造主要发育于边界断层形成的斜坡区附近,从剖面上可以分为上部浅水区、中部斜坡区和下部深水区三个区带。Soft-sediment deformation Structure is named syndepositional deformation structure,and the developmental feature,distribution rule and depositional model are important for the research of reservoir.After the observation of the core in the work area,we found the microfault,liquid dike,liquid twist deformation,ellipsoidal structure,autoclastic breccia,and so on.And we analyzed the stress environment and characteristic of the softsediment deformation structures.By the analysis of the distribution of the soft-sediment deformation structures,the developmental frequency and gradation are related with the angle of dip of the Zhen② fault and Hanliu fault,the distribution of the soft-sediment deformation structures is controlled by the ancient landform.The physical property and communication of the reservoir are changed by the soft-sediment deformation structures.On the base of the depositional model of the soft-sediment deformation structures by predecessors,we set up the new depositional model of the soft-sediment deformation structures of Gaoyou Sag,the soft-sediment deformation structures of work area are mainly developed near the ramp region of boundary fault,and it is departed into 3 parts,the upper shallow-water region,middle ramp region,bottom deep water region.

关 键 词：软沉积物变形构造 微断层 液化变形 沉积模式 高邮凹陷 苏北盆地 

分 类 号：P618.13[天文地球—矿床学]