Neotectonic movement feature and its controlling effect on accumulation in western Qaidam Basin
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摘要: 柴达木盆地喜马拉雅晚期以来的新构造运动活跃,对油气藏形成起了关键作用.以露头调查、地震剖面地质构造解释和油藏解剖资料为基础,结合前人已有研究成果,对柴西地区新构造运动特征及其成藏作用开展研究.新构造运动在现今地貌上表现为狮子沟组区域性不整合和北西西走向的地面构造特征.新构造运动期间断裂表现为深大断裂的再活动和新断裂的形成,并形成反冲构造、断展背斜、纵弯背斜和滑脱褶皱4种构造样式.新构造运动促进了圈闭的形成,并且是油气充注和油气成藏的关键期.新构造运动作用下,构造圈闭形成期与油气充注期匹配越好,越有利于油气成藏;断裂对构造圈闭的破坏作用越小,越有利于油气成藏.Abstract: Since the late Himalayan Movement,neotectonic movements have been active and have played important roles on petroleum accumulation in the western Qaidam Basin.Based on the studies of outcrops,seismic profile geological tectonic interpretations and oil reservoir anatomies,combined with the previous research results,the features of neotectonic movements and their controlling effects on petroleum accumulations were discussed.The neotectonic movements resulted in the present regional unconformities in the Shizigou Formation and the NWW-oriented modern landscapes.During the neotectonic movements,deep faults activated again while new faults came into being,and 4 kinds of structural pattern were formed,including back thrust fault,propagation anticline,longitudinal bend anticline and detachment fold.The neotectonic movements promoted the formation of traps,and had controlling effects on petroleum charging and accumulations.Influenced by the neotectonic movements,the good matching of tectonic trap formation and petroleum charging as well as the weak destruction of fault on tectonic trap are favorable for petroleum accumulation.
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