下刚果盆地A区块下白垩统阿尔布阶混积相研究  

Study on mixed sedimentary facies of Lower Cretaceous Albian in block A of Lower Congo Basin

作　　者：赵灿[1] 郑荣才[1] 于水[2] 郝立华[2] 罗清林[3] 雷光明[3] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室 [2]中海石油研究中心 [3]川庆钻探工程有限公司地质勘探开发研究院

出　　处：《岩性油气藏》2011年第3期84-90,共7页Lithologic Reservoirs

基　　金：国家科技重大专项"大型油气田及煤层气开发"子课题"海相碳酸盐岩层序地层与沉积体系特征及储层预测"(编号:2008ZX05030-003-02)资助

摘　　要：下刚果盆地A区块下白垩统阿尔布阶为一套碳酸盐物质混杂陆源砂、泥沉积,具有典型的混合沉积特征。依据研究区地质背景、测井地质、地震资料和岩石薄片鉴定等资料,对阿尔布阶混合沉积作用进行了精细分析。研究结果如下:①研究区混合沉积特征在剖面结构上表现为由陆源碎屑与碳酸盐物质交互沉积、陆源碎屑与混积物交互沉积、碳酸盐物质与混积物交互沉积和混积物本身的交互沉积等4种类型;②提出了适合该区的"间断-交叉"型碳酸盐物质夹陆源碎屑混积机理,并建立了该区的混积模式;③随着该时期海水的进入、海侵的扩大,整体上阿尔布阶依次经历了混积缓坡、混积局限台地、混积开阔台地和混积陆棚的演化,发育了灰泥丘、砂质浅滩、鲕粒滩、生屑滩、藻屑滩、潮下静水泥、风暴流等众多微相。Lower Cretaceous Albian in block A of Lower Congo Basin deposited a set of carbonate mixed facies composed of terrigenous sand and mud.Based on regional geologic setting,logging geology,seismic data and thin section observation,the mixed deposition of Albian in the study area is analyzed.The research result shows that： ①The profile structure is characterized by 4 types,including alternating deposits of terrigenous debris and carbonate,alternating deposits of terrigenous debris and diamicton,alternating deposits of carbonate and diamicton,and alternating deposits of diamicton themselves;②A mixed deposition mechanism appropriate for the study area is proposed,called ＂discon-tinuity-overlapping＂ mixed deposition,and the mixed deposition model is established;③With the seawater entering and the expansion of transgression,the Albian experienced mixed gentle slope,mixed restricted platform,mixed open platform and mixed continental shelf successively,and developed numerous sedimentary microfacies such as lime mud mound,sandy shoal,oolitic beach,bioclastic shoal,algal-clastic beach,subtidal static water mudstone and tempestite.

关 键 词：阿尔布阶 混合沉积特征 混合沉积相 下刚果盆地 

分 类 号：TE121.13[石油与天然气工程—油气勘探]