珠江口盆地白云凹陷珠海组南部物源及其油气勘探意义

发布时间：2018-02-14 03:54

本文关键词： 物源沉积体系储层疏导层珠海组白云凹陷　出处：《天然气地球科学》2017年10期 　论文类型：期刊论文

【摘要】：珠海组是珠江口盆地白云凹陷重要的油气储层与区域性疏导层,对其物源的认识是研究优质油气储层发育与有效疏导砂体分布的重要基础。基于大量的三维地震数据和钻井资料分析,提出珠海组沉积期白云凹陷发育北部古珠江(主)、南部隆起(次)、东沙隆起(贡献有限)3个物源区。利用详细的地震相分析、钻井岩心岩石组构分析、泥岩黏土矿物分析及碎屑锆石U—Pb年代学分析,重点对关注度较低的南部隆起物源开展研究。结果表明,白云凹陷西南部云开低凸起上普遍发育由南向北的叠瓦状前积地震相及向北东、东方向延伸的下切河道,指示了由南向北及由西向东的碎屑沉积物的搬运过程;云开低凸起及周缘钻井中的珠海组具有较粗的岩石粒度、泥岩中较高的高岭石含量、碎屑锆石以中生代岩浆锆石为主的特征,这与凹陷北部古珠江物源控制下的细—极细岩石粒度、泥岩中较高的伊利石黏土矿物含量、碎屑锆石以前寒武纪—古生代变质锆石为主的特征截然不同。综合分析认为,南部隆起物源为云开低凸起珠海组提供了充足的沉积碎屑物质,并推进至白云主洼,该物源的发育对云开低凸起的油气运移及成藏具有重要的意义。
[Abstract]:Zhuhai formation is an important oil and gas reservoir and regional dredging layer in Baiyun sag of Pearl River mouth Basin. The understanding of its provenance is an important basis for studying the development of high quality oil and gas reservoirs and the distribution of effective dredging sand bodies, based on the analysis of a large number of 3D seismic data and drilling data. This paper puts forward three provenances of Baiyun Sag in the sedimentary period of the Zhuhai formation: the north of the Pearl River, the southern uplift and the Dongsha uplift. The detailed seismic facies analysis is used to analyze the rock fabric of the drilling core. The mineral analysis of mudstone clay and U-Pb geochronology analysis of clastic zircon focus on the source of the southern uplift with low attention. The results show that, The imbricate foreshadowing seismofacies from south to north and the undercut channel extending from north to east indicate the transport process of detrital sediments from south to north and from west to east in Yunkai low uplift in the southwest of Baiyun depression. The Zhuhai formation in Yunkai low uplift and peripheral drilling has coarse rock granularity, high kaolinite content in mudstone, and the characteristics of detrital zircon dominated by Mesozoic magmatic zircon. This is quite different from the granularity of fine to very fine rocks controlled by paleo-Pearl River provenance, the high content of Illite clay in mudstone, and the preCambrian-Paleozoic metamorphic zircon in the northern part of the depression. The southern uplift provenance provides sufficient depositional clastic material for Yunkai low uplift Zhuhai formation and advances to Baiyun main depression. The development of this provenance is of great significance for oil and gas migration and reservoir formation in Yunkai low uplift.
【作者单位】：中海油研究总院;中国地质大学;
【基金】：国家科技重大专项(编号:2016ZX05026007) 国家自然科学基金重大研究计划(编号:91528303)联合资助
【分类号】：P618.13

【相似文献】