柴达木盆地南翼山构造油砂山组混积沉积相特征

南翼山构造位于青海省柴达木盆地西部北区,属于西部坳陷区茫崖凹陷南翼山背斜带上的一个三级构造。通过对取心资料和录井资料统计,工区目的层为以碳酸盐岩为主的碳酸盐岩与砂岩的混积咸水半深湖相加浅湖相沉积。对剖面沉积相、沉积相相序等进行了分析,同时对主要含油小层进行了平面沉积微相展布研究,在此基础上,结合区域地质资料,并以相递变律为理论依据,总结出了南翼山油砂山组沉积相特征。

Mixed sedimentary fades of Youshashan formation in Nanyishan structure of Qaidam basin

Nanyishan structure,located in the north of the western Qaidam basin in Qinghai province,belongs to a third-level structure in the western Mangya depression area of Nanyis-han anticline belt.After coring and mud logging analysis,the target layer is found to be in a mixed sedimentary facies,mainly composed by carbonate and sandstone.Through anal ysis and research of profile sedimentary characteristics,faci es sequence,and microfacies distribution of main oil-bear ing layers,in combination with geologic data and on the ba sis of facies sequence grading rules,the sedimentary facies characteristics of Youshashan formation in Nanyishan struc ture of Qaidam basin has been summarized in this paper.