塔西南昆仑山前冲断带甫沙—克里阳段构造特征与物理模拟
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摘要
受复杂地表条件影响,地震构造建模一直是塔西南昆仑山前冲断带油气勘探中的难点。基于野外地质调查、二维地震、钻井等资料,通过对二维地震剖面进行精细构造解释和生长地层分析,表明塔西南昆仑山前冲断带甫沙—克里阳段主要发育基底卷入式构造、阿尔伯特型构造三角带、被动顶板双重逆冲构造和断层转折褶皱等构造样式,塔西南昆仑山前3排背斜构造带自南向北依次发育于上新世早期、上新世中晚期和更新世早中期。在此基础上,提出了"双滑脱层-单向挤压"冲断构造发育模式,设计并开展了相应的砂箱物理模拟实验。实验结果表明,该模型能够较好地模拟塔西南昆仑山前冲断带甫沙—克里阳段的"前展式"构造变形过程和典型构造样式,物理模拟实验结果与地震构造解释模型吻合,西昆仑造山带隆升产生的强烈向北挤压力和双滑脱层地层结构是塔西南昆仑山前冲断带甫沙—克里阳段构造形成的2个关键因素。
The establishment of seismic structural models has been great difficulty in the petroleum exploration of southwestern Tarim Basin due to complicated surface conditions.The fine structural interpretation and growth formation analysis of 2D seismic sections in Fusha-Keliyang segment were performed based on outcrop survey,2D seismic data and drilling materials.The result shows that structural types of the western Kunlun foreland thrust belt mainly include thick-skinned structure,Alberta-style triangle zone,passive-roof double-thrust structure and fault-bend fold.Furthermore,three rows of anticlinal structure belts in the piedmont zone of the western Kunlun mountain developed from south to north in Early Pliocene,Middle-Late Pliocene and Early-Middle Pleistocene,respectively.On the basis of the foregoing result,a double-decollement plus unidirectional compressing pattern was put forward with respect to the formation of the western Kunlun thrust belt in the southwestern Tarim Basin.A sandbox physical modeling experiment was accordingly designed and carried out.The experimental result indicates that the double-decollement plus unidirectional compressing pattern can be able to better simulate the deformation process and typical structure style of Fusha-Keliyang segment in the western Kunlun thrust belt and the physical simulation fundamentally coincides well with seismic structural interpretation.In addition,both the intensive northward compression created by the lift of the western Kunlun orogenic zone and the double-decollement stratigraphic framework are the two important factors for the formation of Fusha-Keliyang structural segment in the western Kunlun thrust belt.
引文
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