【摘要】 根据地震反射终止关系,结合柴达木盆地第三纪的地质背景,可以将该盆地古近系与新近系划分为7个三级层序。从内部反射结构和外部几何形态出发,再辅之以振幅、连续性等参数,在研究区的古近系与新近系地震反射剖面上可以识别出7种地震相,分别是平行席状地震相、亚平行波状地震相、前积地震相、充填地震相、丘状地震相、透镜状地震相和发散地震相。地震相的分布和演化受沉积体系演化的控制,在测井和钻井资料约束下的地震相解释能够重现柴达木盆地西部地区沉积体系的演化。更多还原

【Abstract】 Paleogene-Neogene in the Qaidam basin can be divided into 7 level Ⅲ sequences based on the seismic reflections terminal relations and geological background in Tertiary Period. According to internal reflection texture and external geometric configuration, there are 7 seismic facies identified, with the help of amplitude and continuity, on the Paleogene-Neogene seismic reflection profile of studying area including parallel sheet seismic facies, sub-parallel wave seismic facies, progradational reflection facies, filling facies, hummocky facies, lens seismic facies and wedged facies. The distribution and evolution of seismic facies are controlled by evolution of depositional system and the seismic facies interpretation bounded by logging and drilling data can show the evolution of ancient depositional system in the western Qaidam basin again.更多还原