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地质学报  2004 

柴达木盆地茫崖坳陷古近系一新近系Ro分布特征及地质意义

, PP. 407-415

Keywords: 青海油田柴达木盆地冲叠剥蚀古近系新近系沉积环境地质构造

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Abstract:

柴达木盆地西部的茫崖坳陷是青海油田的主力油气产区,对该区古近系一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3600―3750m,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。

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