珠江口盆地恩平凹陷A-1井区珠江组沉积相研究及其演化分析

Sedimentary Facies Analysis and Evolution of Wellblock A-1 in Zhujiang Formation of Enping Depression in the Pearl-river Mouth Basin

珠江口盆地恩平凹陷A-1井区珠江组三角洲沉积发育;通过对A-1井的岩心观察,结合粒度概率累积曲线和C-M图分析,在珠江组识别出11种岩石相以及2种岩石相组合;在A-1井珠江组中识别出分流河道、水下分流河道、受潮汐影响的水下分流河道、分流间湾和河口砂坝等沉积微相。通过对研究区典型沉积微相、亚相的测井响应特征和地震响应特征的分析总结,在沉积相综合研究的基础上,对珠江组的沉积演化史进行探讨,从而为后期的勘探开发提供依据。

The area of Zhujiang Formation of Wellblock A-1 in Enping Depression of the Pearl-river Mouth Basin had the characteristics of delta deposit develpment.On the basis of observation and description of cores from Wellblock A-1 and lithological analysis,the combination of 10 types of lithofacies and 2 types of lithofacies of the Zhujiang Formation was identified according to the lithological characteristics and probability cumulative curve and C-M plot.Then it could be identified as distributary channel,submarine distributary channel,tide-influenced submarine distributary channel,inter-distributary area,channel mouth bar,and so on.Through the analysis and summarization of logging and seismic response characters of microfacies and subfacies in the studied area,in combination with the comprehensive research on depositional facies,the sedimentary evolution of Zhujiang Formation is discussed.It provides some important guidances for further oil exploration and development.