论文部分内容阅读
柴达木盆地西部的茫崖坳陷是青海油田的主力油气产区 ,对该区古近系—新近系镜质组反射率(Ro)进行了系统研究 ,发现其垂向分布有两种规律 :一是 Ro 与垂深有良好的线性关系 ,多分布在坳陷中央 ,反映了沉积环境、物源和构造的稳定性较好 ;二是 Ro 与垂深呈右阶状 ,反映了逆冲叠覆。此外 ,通过 EASY% Ro 方法计算了研究区地层剥蚀厚度 ,认为干柴沟—油泉子为英雄岭隆起的主轴 ,因为剥蚀了 36 0 0～ 375 0 m,所以英雄岭主峰在地形上呈现出隆起主轴的假貌。通过地层剥蚀厚度的研究 ,还发现油气田主要分布在剥蚀梯度带上。这一结论对柴达木盆地油气勘探开发具有重要意义
The Mangya depression in western Qaidam basin is the main oil and gas producing area of Qinghai oilfield. The study of the vitrinite reflectance (Ro) of Paleogene and Neogene in this area shows that there are two kinds of vertical distribution : First, Ro has a good linear relationship with vertical depth and is distributed in the center of the depression, which reflects the sedimentary environment and the stability of provenance and structure are good. Second, Ro is right-order with vertical depth, reflecting the thrust Overlay. In addition, the EASY% Ro method was used to calculate the denudation thickness of the strata in the study area. It is considered that the main axis of the Sagamigou-Youquanzi is the Yingxiling uplift, and the main peak of Yingxiongling shows uplift on the terrain due to the erosion of 3600 ~ 37500 m Spindle’s appearance. Through the study of formation denudation thickness, it is also found that the oil and gas fields are mainly distributed in the erosion gradient zone. This conclusion is of great significance to oil and gas exploration and development in the Qaidam Basin