【摘要】 前人研究成果多认为惠州凹陷西南部珠海组形成于辫状三角洲环境,或以受海侵影响的三角洲前缘沉积作用为主。在对研究区宏观构造—古地理背景分析之上,以岩心详细观察与描述为基础,通过岩相、测井相并辅助宏观地震相分析,提出珠海组沉积时期来自古珠江三角洲体系提供的丰富砂质沉积物在该区经历了潮汐的强烈改造作用,以潮汐沉积作用为主的认识。详细描述了发育在珠海组的潮汐沉积构造、潮下带、潮间带与潮上带沉积序列及其相组合特征,并以单井相分析为基础,结合区域地震相分析了研究区沉积相宏观展布特征。这一新认识为该区油气勘探,特别是位于该区主体部位的油气田开发中储层预测提供了依据和新思路。更多还原

【Abstract】 Previous studies consider that Zhuhai Formation in southwestern Huizhou depression was formed in the braided delta environment,or dominated by delta front which experienced transgressive reworking.Based on the palaeogeographic background analysis,the detailed observation and description of cores,combined with the analysis of lithofacies,electro-facies and seismic facies,this study reveals that deposit of Zhuhai Formation rich-in sand supplied by the Pearl River delta experienced reworking of strong tides,and is dominated by tidal sedimentation.In this paper,tidal sedimentary structure,sedimentary sequence and facies succession of inter-tidal and supratidal facies have been detailly described.The regional distribution of depositional system in the study area has been revealed based on facies analysis of single well,combined with regional seismic facies analysis.This new understanding will be favorable for oil and gas exploration and development in this area.更多还原