珠江口盆地东沙隆起生物礁地质及地震特征
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
东沙隆起珠江组生物礁是珠江口盆地重要的储层类型,礁灰岩主要为珊瑚藻灰岩,分为骨架岩、粘结岩及障积岩。研究区生物礁发育于开阔台地、台地边缘及台地前缘斜坡3类沉积相中,生物礁类型可分为台内点礁、台地边缘堡礁及台缘斜坡塔礁,以台地边缘堡礁为主。珠江组沉积早期,东沙隆起发育滨岸砂质沉积;中期海水逐渐淹没东沙隆起,形成镶边浅水碳酸盐台地,发育生物礁;晚期海侵台地逐渐淹没消亡,被浅海陆棚泥质沉积代替。流花台地厚度最大,最厚达563m,台地顶面地震强反射使外形轮廓清晰,台地内部中-弱振幅至空白反射,连续性降低;惠州台地厚度较流花台地薄,厚度多大于100m,顶界面强反射轮廓清晰,内部层状反射能量强-中振幅、高-中连续、中-低频,局部空白反射;陆丰台地厚约30m,只有一个高连续的强振幅。生物礁地震响应以丘形、箱型、低丘-透镜状为特征,礁顶常为强振幅,内部为波状、有时见前积结构,翼部可见上超和披覆现象等。
The reef limestones in the Zhujiang Formation on the Dongsha uplift may be classified into three types:framestone,bindstone and bafflestone developed in the open platform,platform-margin and foreslope facies,and composed of the intraplatform patch reefs,platform-margin barrier reefs and foreslope pinnacle reefs,respectively.During the early stages of the deposition of the Zhujiang Formation,the littoral sandy deposits were initiated on the Dongsha uplift,followed by the rimmed shallow-water carbonate platforms during the middle stages. During the late stages,the carbonate platforms were gradually drowned and consumed by trangressions,and then the shallow shelf muddy deposits were accentuated. Among the carbonate platforms,the Liuhua platform has a maximum thickness of563 m,and displays strongly seismic reflection on the topmost part while moderate-weak amplitudes and reflection and poor continuity in the interior of the platforms. The Huizhou platform with a thickness of more than 100 also displays strongly seismic reflection on the topmost part while strong-moderate amplitudes,high-moderate continuity and moderate-low frequency and locally blank reflection in the interior of the platforms. The Lufeng platform only with a thickness of about 30 m exhibits highly continuous strong amplitudes. The seismic reflection configurations generally display the mound,box,low hills-lenticular forms. The onlapping and draping can be observed as well.
引文
[1]陈长民、施和生、许仕策等.东沙隆起第三系油气藏形成条件[M].北京:科学出版社,2003.
    [2]朱伟林、张功成、杨少坤等.南海北部大陆边缘盆地天然气地质[M].北京:石油工业出版社,2007.
    [3]庞雄、陈长民、邵磊等.白云运动-南海北部渐新统中新统重大地质事件及其意义[J].地质论评,2007,53(2):146-150.
    [4]施和生、秦成岗、高鹏.珠江口盆地番禺低隆起-白云凹陷北坡天然气晚期成藏特征[J].中国海上油气,2008,20(2):73-46.
    [5]施和生、李文湘、邹晓萍等.层序地层学在东沙隆起油田开发中的应用[J].中国海上油气(地质),2000,14(1):15-20.
    [6]刘军、施和生、杜家元等.东沙隆起台地生物礁、滩油藏成藏条件及勘探思路探讨[J].热带海洋学报,2007,26(1):23-27.
    [7]何家雄、陈胜红、刘海龄等.南海北部边缘盆地区域地质与油气运聚成藏规律及特点[J].西南石油大学学报,2008,22(5):91-98.
    [8]孙珍、庞雄、钟志洪等.珠江口盆地白云凹陷新生代构造演化动力学[J].地学前缘,2005,12(4):489-498.
    [9]魏喜、邓晋福、谢文彦等.南海盆地演化对生物礁的控制及礁油气藏勘探潜力分析[J].地学前缘,2005,12(3):245-252.
    [10]魏喜.南沙海域断裂系统对含油气盆地的控制[J].海洋科学,2005,29(6):66-68.
    [11]何炎、胡平忠.南海东沙隆起早中新世生物礁中的大有孔虫[J].古生物学报,1995,34(1):18-39.
    [12]范嘉松.中国生物礁与油气[M].北京:海洋出版社,1996.
    [13]姚伯初、曾维军等.中美合作调研南海地质专报[M].武汉:中国地质大学出版社,1994.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心