柴达木盆地南翼山构造样式及其与油气成藏关系:三维地震解释新证据

发布时间：2018-10-14 16:57

【摘要】：三维地震资料解释和构造分析表明,南翼山背斜两翼发育两组与背斜轴向近平行的左行压扭性断裂带(走向约310°),断裂带剖面形态为正花状构造,背斜发育三组次级断裂,可分别与走滑里德尔剪切模型中的R、R'、X面很好地匹配,特征次级断裂性质与南翼山边界左旋走滑断裂带属性相符。晚新生代以来,柴西南地区受控于阿尔金断裂和昆北断裂系,整体处于压扭性环境之中,形成了一系列以南翼山为代表的压扭性背斜构造,不存在大规模逆冲构造。南翼山左行花状压扭性断裂带活动导致的背斜隆起及其派生的张性次级断裂是控制南翼山油气藏形成的重要因素,花状压扭性断裂带和背斜隆起形成了构造圈闭,而次级断裂沟通了烃源岩与储层,形成了油气向上运移的通道和储集空间。
[Abstract]:Three dimensional seismic data interpretation and structural analysis show that two groups of left-lateral compressional and torsional faults (strike 310 掳) are developed in the two wings of the Nanyishan anticline, which are nearly parallel to the back slope axis. The profile of the fault zone is a normal flower-like structure, and three sets of secondary faults are developed in the anticline. The characteristics of the secondary faults are consistent with the attributes of the left-lateral strike-slip fault zone at the Nanyishan boundary. Since the late Cenozoic, the southwestern Qaidam area is controlled by the Altun fault and the northern Kun fault system, and the whole area is in a compression-torsional environment, forming a series of compression-torsional anticline structures represented by Nanyishan, and there is no large-scale thrust structure. The anticline uplift and its derived tensional secondary faults caused by the activity of the flower-shaped compression-torsional fault zone on the left side of Nanyishan are the important factors controlling the formation of the oil and gas reservoirs in Nanyishan, and the structural traps are formed in the flower-shaped compression-torsional fault zone and the anticlinal uplift. The secondary fault connects the source rock and reservoir and forms the channel and reservoir space for the upward migration of oil and gas.
【作者单位】：北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室;中国石油青海油田公司;
【基金】：中油股份科技重大专项(2011E-03)
【分类号】：P618.13;P631.4

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