柴达木古近纪—新近纪盆地的形成演化

Formation and evolution of Qaidam Paleogene and Neogene Basin

目的 对柴达木新生代盆地不同时期的构造格局和盆地演化进行解剖。方法 对柴达木盆地地震、非地震资料进行综合解释,结合钻井及区域资料进行综合研究。结果 新生代盆地深、浅层构造存在较大差异,盆地沉积在不同时期受不同构造格局的控制,古近纪时受近东西向构造控制,新近纪时受北西向构造控制,显示了柴达木盆地新生代时为不同时期受不同方向构造控制的大型叠合盆地。结论 盆地经历了多旋回沉积和多方式的后期改造,不同的构造组合形成了不同的储油气构造模式,对于盆地深层的油气勘探,特别是寻找隐蔽油气藏具有重要意义。

Aim The structural framework and evolution of Qaidam Cenozoic basin are researched by means of the comprehensive interpretation of seismic and non-seismic data. Methods The low and upper structural framework is quite different. In different stage, basin sediment is controlled by different structural framework. Results The near EW-trending structures control the Paleogene basin sediment and NW-trending structures control the Neogene basin sediment. Conclusion Qaidam Basin is a large superposed basin controlled by different direction structures in different stage. The basin undergoing multicycle sediment evolution and multi manner late-deformation and different structure combination forms different structural reservoir model. It is very important to recognize these for oil and gas exploration in deep basin, especially for the concealed reservoir exploration.