华北油田蠡县斜坡沙河街组混积类型研究

Study of Huabei Oilfield Lixian Declivity Shahejie Group Mixed Sedimentary Type

蠡县斜坡发育大量陆源碎屑与碳酸盐的混合沉积。综合前人研究成果,结合大量的区域地质资料、野外露头资料和钻井资料等,对蠡县斜坡沙河街组混合沉积进行了详细的研究。研究结果表明:研究区内碳酸盐与陆源碎屑的混合沉积发育明显,在同一岩层内形成混积岩,在不同岩层的混合沉积特征则表现为4种不同的混积层系,分别为陆源碎屑岩—碳酸盐岩混积层系、陆源碎屑岩—混积岩混积层系、碳酸盐岩—混积岩混积层系、混积岩层系;根据混积岩的成因将混合沉积类型分为3类,即渐变式混合沉积、突变式混合沉积和复合式混合沉积,其中复合式混合沉积又进一步分为复合式混合沉积I和复合式混合沉积II。研究区内主要发育渐变式混合沉积、突变式混合沉积和复合式混合沉积I。

Lixian declivity have much mixed sedimentation of terrigenous clastic composition and carbonate.Based on the analysis of the previous studies,synthesize the relevant data,such as a large number of regional geological data,field outcrop data and drilling data,etc,have detailed research at Lixian declivity Shahejie group mixed sedimentary carried. Numerous studies have shown that there are much of mixed sedimentation of terrigenous clastic composition and carbonate on the research area,forms the peperite in the same rock stratum,mixed sedimentation characteristics in the different rock stratums have four types,they are terrigenous clastic rocks,carbonate mixed product series、terrigenous clastic rock- peperite mixed product series、carbonate- peperite mixed product series and mixed rock deposition system. Based on the origin of peperite,the type of mixed sedimentation be divided into three groups( Dongguiyu,2007),are The gradient type mixed deposits,Mutation type mixed deposits and Complex mixed deposits of which be divided intoⅠandⅡ.