珠江口盆地惠州凹陷新近系珠江组K22陆架砂脊沉积成因分析<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2016.05.059

摘要/Abstract

摘要： 通过分析珠江口盆地惠州凹陷新近系珠江组NE—SW向平行于古岸线展布的K22条带状砂体外部地震反射特征、内部反射结构及平面展布规律,并运用层序地层学方法和理论,结合海平面变化特点,对K22条带状砂脊沉积成因进行了研究。结果显示:K22条带状砂脊为发育在陆架区古构造高带、受控于强制性海退过程的再沉积产物,其物源来自于早期的三角洲,沉积水动力条件多样,主要为海退过程中的潮汐流和波浪作用;同时,沿岸流也对砂脊形态的形成起到了关键作用,这些砂脊后期得益于快速的海侵而保留下来。留存下来的沙脊沉积被包裹在海相泥岩背景中,可形成良好的岩性圈闭。

关键词: 珠江口盆地, 惠州凹陷, 新近系, 珠江组, K22陆架砂脊, 沉积成因

Abstract: Based on external characteristics,the inner structure and the plain distribution of seismic reflection,as well as the eustatic sea level changes,the sedimentary genesis of NE-trending banded K22 shelf sand ridges of the Zhujiang Formation in Huizhou sag,Pearl River Mouth River Basin, was studied with the sequence stratigraphy theory and method. The results show that the K22 shelf sand ridges were considered to be redeposited products primarily formed during the forced regression. The K22 shelf sand ridges were preferentially present on high paleo-tectonic locations with the former delta as provenance. The diverse depositional hydro-dynamics mainly included tide currents and wave effects,besides,coastal currents also contribute to the shape of the K22 shelf sand ridges. The sand ridges were preserved benefiting from the subsequent fast transgression,which were then wrapped in the marine mud and would be available to form lithological traps.

Key words: Pearl River Mouth Basin, Huizhou sag, Neogene, Zhujiang Formation, K22 shelf sand ridges, depositional genesis

中图分类号:

512.2

丁琳, 杜家元, 罗明, 李小平, 颜晖, 郑嘉. 珠江口盆地惠州凹陷新近系珠江组K22陆架砂脊沉积成因分析^*[J]. 古地理学报, 2016, 18(5): 785-798.

Ding Lin, Du Jiayuan, Luo Ming, Li Xiaoping, Yan Hui, Zheng Jia. Analysis of depositional genesis of K22 shelf sand ridges in the Neogene Zhujiang Formation in Huizhou sag,Pearl River Mouth Basin[J]. JOPC, 2016, 18(5): 785-798.

http://www.gdlxb.cn/CN/Y2016/V18/I5/785

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