海陆交互相三角洲高分辨率层序地层探析——以珠江口盆地惠州凹陷珠海组为例

Research on high-resolution sequence stratigraphy of marine-continental alternating fades delta-taking Zhuhai Formation in Huizhou Sag,Pearl River Mouth Basin as an example

针对海陆交互地区三角洲沉积体系特征,采用高分辨率层序地层多级次基准面旋回划分方案,通过对地震与测井等资料的综合分析,研究珠江口盆地惠州凹陷珠海组海陆交互相三角洲沉积体系的高分辨率层序地层学特征,在珠海组中识别出短期、中期和长期3个级别的基准面旋回。在此基础上,运用等时对比法则对各级旋回进行对比并建立层序地层格架,归纳了珠海组沉积时期2个长期基准面旋回内的沉积体系演化规律及其特征。

On the basis of synthetic analysis of data on seismic,core and well logging,and using the multi-order-times division scheme of base-level cycle,the high-resolution sequence stratigraphic characteristics of sedimentary systems of marine-continental alternating facies delta in Zhuhai Formation,Huizhou Sag,Pearl River Mouth Basin are researched according to the system characteristics.Three orders of short-term,middle-term and long-term base-level cycles can be recognized from the formation.Isochronous stratigraphic correlation principle is applied to the comparison among each-grade-time cycles and to building the sequence stratigraphic framework.And the evolution rule and character of the sedimentary systems in the two long-term base-level cycles of Zhuhai sedimentary period are concluded.