海相油气地质2023，Vol.28Issue(4)：391-400,10.DOI:10.3969/j.issn.1672-9854.2023.04.006
珠江口盆地恩平凹陷A油田新近系储层钙质砂岩夹层成因
Genesis of calcareous sandstone interlayer in Neogene reservoir of A Oilfield in Enping Sag,Pearl River Mouth Basin
摘要
Abstract
The main reservoir of A Oilfield in Enping Sag is developed in the front of ancient Pearl River delta of the Neogene Hanjiang Formation and Zhujiang Formation.The fact that main reservoirs of the Neogene system generally contain calcareous sandstone interlayers has a significant impact to refined development of A Oilfield,and it is urgent to accurately understand the origin and distribution patterns of these calcareous sandstone interlayers.Based on detailed observation and analysis of rock cores,this paper uses cast thin sections of sandstone to analyze the origin of calcium interstitial materials.Furthermore,by combining analysis of sedimentary facies,particle size,logging curves,rock density,and seismic inversion methods,it is determined that the calcium sandstone interlayer in the main reservoir of Neogene in the study area is mainly sedimentary origin,with a small amount belonging to the cementation origin during diagenesis.The front of the ancient Pearl River delta is often transformed by waves to form coastal sand bars.The calcareous sandstone interlayer is mainly formed in the onshore backshore or mixed flat subfacies behind the dam of the coastal sand bar.It is formed through carbonate mineral deposition caused by strong evaporation of seawater in the shallow water or exposed environment of intertidal supratidal zone cementing sandy debris particles.The distribution patterns of calcareous sandstone interlayers adjacent to the mudflats or lagoons behind the dam in a vertical direction are similar.关键词
钙质砂岩夹层/沿岸砂坝/新近系/恩平凹陷/珠江口盆地Key words
calcareous sandstone interlayer/coastal sand bars/Neogene/Enping Sag/Pearl River Mouth Basin分类
能源科技引用本文复制引用
戴建文,柴愈坤,王冠民,孙爽,郭飞,薛亚..珠江口盆地恩平凹陷A油田新近系储层钙质砂岩夹层成因[J].海相油气地质,2023,28(4):391-400,10.基金项目
本文受国家科技重大专项课题"近岸深水粗碎屑岩沉积构型与有利储层评价"(编号:2016ZX05009-002)资助 （编号:2016ZX05009-002）
