石油学报 ›› 1988, Vol. 9 ›› Issue (2): 12-18.DOI: 10.7623/syxb198802002

• 地质勘探 • 上一篇    下一篇

廊固凹陷沙三段主要沉积体的地震相和沉积相特征

曾洪流, 张万选, 张厚福   

  1. 华东石油学院北京研究生部
  • 收稿日期:1986-02-26 出版日期:1988-04-25 发布日期:2013-07-08

SEISMIC AND DEPOSITIONAL CHARACTERISTICS OFMAJOR SEDIMENTARY BODIES IN 3RD SECTION OF SHAHEJIE FORMATION LONGGU DEPRESSION

Zeng Hongliu, Zhang wanxuan, Zhang Houfu   

  1. Beijing Graduate School Of East China petroleum Institute
  • Received:1986-02-26 Online:1988-04-25 Published:2013-07-08

摘要: 廊固凹陷沙三段是中国东部下第三纪典型的箕状湖盆沉积,主要发育三种沉积体.近岸水下扇沉积在主要生长断层下降盘的深水环境中,以帚状前积、杂乱前积和前积一退积结构为代表,有不同的沉积意义.扇三角洲的地震特征是S形前积结构.浊积扇既可集中沉积形成丘状,深水上超和前积地震相,也可呈分散状态,没有典型的地震标志;它们通常不独立存在,而与近岸水下扇、湖底侵蚀谷或扇三角洲等组成共生沉积体系.

关键词: 近岸水下扇, 廊固凹陷, 扇三角洲, 地震相单元, 浊积扇, 沙三段, 沉积相特征, 沉积体系, 沉积物, 前积层

Abstract: The 3rd section of the Shahejie.Formation in Longgu Depression is among the thpical sediments of the Paleogene nonmorine half-graben-type basins in East China.There are mainly three kinds of depositional facies.Nearshore subaquatic fans accumulated on the downthrows of major growth faults in deep water environments.They can be divided into three types,which are characterized by the broom7like prograda-tional,the chaotically progradational,and the progradational-retro-gradational configurations,respectively,and have different sedimentologic meanings.Fan delta commonly show the sigmoid progradational configurations.Turbidite fans could either accumulated to form the mounded,the deep-water on lap,and the progradational facies,or be in a diseminated state without typical seismic responses;They usually didn't exist independently,but were related in origin to nearshore subaquatic fans,fan delta,or deep water channels,forming depositional systems.