珠三坳陷珠海组海陆过渡相沉积特征及储层控制因素  

Sedimentary characteristics and reservoir controlling factors of sea-land transition in Zhuhai Formation, Zhu-3 Depression

作　　者：钟玉婷 董艳蕾[1,2] 李顺利[3] 孙连浦 闾伟 齐昕胧 ZHONG Yuting;DONG Yanlei;LI Shunli;SUN Lianpu;LYU Wei;QI Xinlong(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Sino Geotech(Beijing)Company Limited,Beijing 100015,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国地质大学(北京)能源学院,北京100083 [4]华夏吉泰(北京)科技有限公司,北京100015

出　　处：《东北石油大学学报》2023年第4期39-56,106,I0003,I0004,共21页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2017ZX05001-002-002);国家自然科学基金项目(41202078)。

摘　　要：珠江口盆地珠三坳陷是中国南海北部大陆地区的主要产油区之一,储层物性差异较大,油气不集中。根据珠三坳陷珠海组岩心、钻井、测井和岩石薄片等资料,结合扫描电镜和常规物性分析,分析珠三坳陷珠海组沉积微相类型及储层特征,明确储层物性的控制因素。结果表明:受潮汐作用控制,珠三坳陷珠海组发育扇三角洲、辫状河三角洲和潮坪沉积体系,沉积微相以水下分流河道、河口坝、分流河道间及混合坪为主,其中河口坝物性最好,混合坪和水下分流河道物性次之,分流河道间物性最差。沉积微相的砂岩厚度、岩石粒度及沉积构造不同,储层孔隙度和渗透率也存在差异;成岩作用决定储层后期改造,珠海组以压实作用、胶结作用和溶蚀作用为主,其中压实作用和胶结作用为破坏性成岩作用,溶蚀作用为建设性成岩作用。该研究结果对珠江口盆地珠三坳陷后续勘探具有指导意义。The Zhu-3 Depression in the Pearl River Mouth Basin is one of the main oil-producing areas in the northern continental area of the South China Sea,the physical properties of reservoirs in the study area are quite different,and the oil and gas are not concentrated.Taking the Zhuhai Formation of Zhu-3 Depression in Pearl River Mouth Basin as an example,according to the data of cores,drilling,logging and thin sections of rock,combined with scanning electron microscopy and conventional physical property analysis to illustrate sedimentary microfacies types and reservoir characteristics of the Zhuhai Formation in Zhu-3 Depression,and analyze the controlling factors of reservoir physical property.The results show that it is controlled by tidal action,fan delta,braided river delta and tidal flat system are developed in Zhuhai Formation of Zhu-3 Depression.The sedimentary microfacies are mainly composed of underwater distributary channel,mouth bar,interdistributary channel and mixed flat,and mouth bar has the best physical properties,mixed flat and underwater distributary channel take the second and interdistributary channel is the last.The sedimentary microfacies sandstone rock granularity,thickness and sedimentary structure are different,which directly leads to the difference of reservoir porosity and permeability.Diagenesis determines the later reformation of reservoir.Compaction,cementation and dissolution are the main processes of Zhuhai Formation in the study area.The compaction and cementation are destructive diagenesis,and the dissolution is constructive diagenesis.The research result has important oil and gas geological significance for subsequent exploration of zhu-3 Depression in Perarl River Mouth Basin.

关 键 词：珠江口盆地 珠三坳陷 珠海组 沉积微相 沉积特征 物性特征 控制因素 

分 类 号：TE122[石油与天然气工程—油气勘探]