珠江口盆地东部T_3~2层序界面的特征及生物定年
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摘要
以二维、三维地震和钻测井等资料为基础,参考古生物资料,对珠江口盆地东部陆丰、惠州、西江、恩平、白云凹陷以及东沙隆起和番禺低隆起中T23的层序界面进行分析,共识别出4种界面类型,分别为削截型、下切峡谷型、顶超型、上超型,并结合地震属性分析,揭示了下切峡谷型的分布特征。通过地震剖面横向的对比和分析,使T23层序界面在珠江口盆地东部各二级构造单元之间具有了统一性、可对比性和等时性,同时,经过生物定年,确定其年代为10Ma。
Based on 2D and 3D seismic data,well drilling and logging data and in allusion to palaeontologic data,the sequence boundary T23 in the eastern Pearl-river Mouth Basin was analyzed and 4 boundary types were identified,such as truncation,incise canyon,toplap and onlap.In combination with the seismic attribute analysis,the distribution characteristics of incise canyon were revealed.By horizontal comparison and analysis of seismic profile,unity,chronotaxy and isochroneity of T23 are obtained during secondary structural unit in the eastern Pearl River Mouth Basin,and its biochron is 10Ma.
Based on 2D and 3D seismic data,well drilling and logging data and in allusion to palaeontologic data,the sequence boundary T23 in the eastern Pearl-river Mouth Basin was analyzed and 4 boundary types were identified,such as truncation,incise canyon,toplap and onlap.In combination with the seismic attribute analysis,the distribution characteristics of incise canyon were revealed.By horizontal comparison and analysis of seismic profile,unity,chronotaxy and isochroneity of T23 are obtained during secondary structural unit in the eastern Pearl River Mouth Basin,and its biochron is 10Ma.
引文
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[3]庞雄,陈长民,施和生,等.相对海平面变化与南海珠江深水扇系统的响应[J].地学前缘,2005,12(3):167~177.
[4]朱筱敏.层序地层学[M].东营:石油大学出版社,2003.
[5]王春修.琼东南盆地晚新生代层序地层学研究[J].中国海上油气.地质,1992,6(5):11~20.
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