古地理学报2017，Vol.19Issue(1)：89-98,10.DOI:10.7605/gdlxb.2017.01.007
沧东凹陷始新统孔店组二段深水细粒沉积岩中的软沉积物变形构造
Soft-sediment deformation structures in deepwater fine-grained sedimentary rocks of the Member 2 of Eocene Kongdian Formation,Cangdong sag
摘要
Abstract
The soft-sediment deformation structures in fine-grained sedimentary rocks of deepwater lacustrine are mainly developed in strata of mudstone and micritic carbonate rocks.Most of the soft-sedi-ment deformation structures are prone to be ignored in the core observation because of the small size (mi-croscopic scale).The authors take Well G1 08-8 in the Member 2 of Eocene Kongdian Formation in Cang-dong sag as research object to identify the synsedimentary micro fracture,liquefied vein,micro fold de-formation,micro weight deformation,random deformation and other types of soft-sediment deformation structures through the intensive microscopic observation and elaborate core description.The soft-sediment deformation structures formed in deepwater fine-grained sedimentary rocks in the study area overall have characteristics like small scale,no association of obvious gravity flow sand body in vertical,in situ origin, sedimentary laminae developed and so on.The formation mechanism of soft-sediment deformation structures can be divided into the overlying stress unloading,lateral extrusion stress and internal stress release from the view point of the styles of stress adjustment,and the different formation mechanisms response to multi-ple changes of sedimentary environments.The research of soft-sediment deformation structures formed in deepwater fine-grained sediments of lacustrine can reconstruct the changes of ancient sedimentary environ-ments and predict the gravity flow direction.It also has a great guiding significance to oil and gas explora-tion in the deepwater fine-grained sedimentary rocks.关键词
湖相深水沉积/细粒沉积岩/软沉积物变形/孔二段/沧东凹陷/成因分析Key words
deepwater sediment in lacustrine/fine-grained sedimentary rock/soft-sediment de-formation structures/the Member 2 of Kongdian Formation/Cangdong sag/genetic analysis分类
天文与地球科学引用本文复制引用
鄢继华,焦玉玺,陈世悦,邓远,蒲秀刚..沧东凹陷始新统孔店组二段深水细粒沉积岩中的软沉积物变形构造[J].古地理学报,2017,19(1):89-98,10.基金项目
国家自然科学基金项目（编号41572087）和中央高校基本科研业务费专项（编号15CX06004A）联合资助。［Co-funded by the Na-tional Natural Science Foundation of China （No．41572087） and the Fundamental Research Funds for the Central Universities （No．15CX06004A）］ （）
