论文部分内容阅读
柴达木盆地西部地区E1+2—N11经历湖侵后,随西南缘昆仑山脉的大规模隆升,N21开始进入湖退阶段,湖盆沉积中心自西南向东北方向迁移。油砂山地区N1—N12即是在这样的背景下沉积的辫状河三角洲-浅湖体系。油砂山油田育—Ⅰ油组总体为向上变浅的反旋回沉积。Ⅶ油组以下(N1)主要为辫状河三角洲前缘-滨浅湖沉积;Ⅶ油组及其以上(N12)主要为辫状河三角洲平原-前缘沉积。从平面上看,Ⅱ、Ⅲ、Ⅳ、Ⅴ断块沉积稳定,油层分布受构造控制,而Ⅰ、Ⅵ断块受岩性因素影响较大。
After E1 + 2-N11 in western Qaidam Basin experienced the lake invasion, with the large-scale uplifting of the Kunlun Mountains in the southwestern margin, N21 began to enter the lake retreat phase, and the lake sedimentary center migrated from southwest to northeast. The N1-N12 in the oil sands zone is the braided delta-shallow lake system deposited under such a background. The oil-sands oil-Ⅰ-oil group in Yushushan oil field is generally an anti-cyclonic sediment up-shallow. Below the Ⅶ oil group, (N1) is predominantly braided river delta front - shallow lake deposits; Ⅶ oil group and above (N12) is mainly braided delta plain - leading edge sediments. From the plane, the sediments of faults Ⅱ, Ⅲ, Ⅳ and Ⅴ are stable, and the distribution of oil reservoirs is controlled by tectonics. However, the faults of Ⅵ and Ⅵ are greatly influenced by lithology.