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地球学报  2009 

塔西南阿其克背斜地质构造特征及与油气关系

DOI: 10.3975/cagsb.2009.02.16

Keywords: 塔西南坳陷,阿其克背斜,断层相关褶皱,油气控制

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Abstract:

阿其克背斜是塔里木盆地西南坳陷南缘的一个横向转换构造,该构造的特殊性在于其枢纽走向与造山带总体是垂直的,而非平行。笔者通过分析阿其克背斜南、中、北3段地质剖面及各剖面中核部与两翼地层的极射赤平投影,揭示了阿其克背斜的几何学、运动学、动力学特征。结合地震解释剖面、区域构造背景及前人研究成果,建立了阿其克背斜形成过程的地质模型,认为它是在断层传播褶皱和断层转折褶皱共同作用下,以断层传播作用为主分3个阶段形成的断坡背斜构造,垂向上自下而上分原地系统、准原地系统和外来系统中的推覆体3个构造层次。塔里木盆地的菱形边界性质造成阿其克地区EW向的挤压应力场。由于背斜上部外来系统中的推覆体南部翘起遭受剥蚀,东侧被阿其克断层破坏,因此对油气圈闭不利,但在北部异地推覆体之下,原地系统中过熟烃源岩及毗邻凹陷内的烃源岩可以通过断层、不整合面向上部准原地系统中的宽缓背斜圈闭供给油气。

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