摘要
第四纪全新世,研究区主要发育充填水道和深海平原。由于地震反射波同向轴连续整一,无上超、削截等现象,利用地震反射终止类型进行层序界面划分难度较大。文中基于沉积时间顺序确定目标层位,研究了层间地震相和沉积相在时间和空间的分布特征以及沉积相演化。研究区识别出6种地震沉积相类型,即丘状反射—盐(泥)丘体、充填状反射—"U"(V)型水道、透镜状反射—水道充填相、楔形反射—三角洲沉积、平(亚平)行席状反射—深海平原和杂乱反射地震相。Q_(104)—Q_(10)时期沉积相呈复杂的水道—三角洲体系到较简单的水道沉积体系发展趋势。
Holocene filling channels and deep sea plains are well developed in the research area.Since the seismic reflection waves along the same axis shows no discontinuous phenomena such as overlapping and truncation,it is difficult to define sequence boundaries.Target intervals are thus calibrated by deposition time in this paper.Six types of seismic sedimentary facies are identified,including the mound-like reflection from salt or mud deposits,filling reflection from'U'(V)type channels,lenticular reflection from channel filling deposits,wedge-like reflection from deltaic deposits,flat and sheetlike reflection from deep sea plain and disordered reflection seismic facies.Upon the basis,the spatiotemporal distribution pattern of seismic facies and sedimentary facies as well as facies evolution are studied.Our results suggest that during the period Q104—Q10,there is a evolutional trend of sedimentary facies from a rather complex deltaic system to a simpler one.
作者
李磊
张鹏
邹韵
平坛桥
庄岩
王铣慧
LI Lei;ZHANG Peng;ZOU Yun;PING Tanqiao;ZHUANG Yan;WANG Xianhui(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China)
出处
《海洋地质前沿》
CSCD
2019年第3期31-39,共9页
Marine Geology Frontiers
基金
西安石油大学研究生创新与实践能力培养计划资助(YCS18212031)
中海油湛江分公司项目(RFQZJ17F020/01)
关键词
莺歌海盆地东方区
第四系
地震沉积相
沉积演化
Dongfang area
Yinggehai Basin
Quaternary
seismic and sedimentary facies
sedimentary evolution
