Synergistic deformation mechanisms and basin-mountain coupling of Kelasu structural belt in Kuqa Depression
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摘要: 克拉苏构造带构造非常复杂，经过30余年的油气勘探开发，构造规律不清楚、构造圈闭不落实的问题仍然非常突出。本文通过大量三维地震资料的构造解释、建模及实钻资料验证，发现克拉苏构造带在剖面上呈分段分层变形、平面上呈雁列式展布特征。提出克拉苏构造带两种协同变形机制，较好地解释了在膏盐层调节作用下盐上、盐层、盐下3个构造层的差异变形现象。结合遥感影像及重力异常影像分析了盆山耦合关系，提出了南天山造山带的差异隆升推覆作用，南部温宿、新和、牙哈古隆起的阻挡作用和古近系膏盐层的调节作用是变形的3个主要影响因素，并据此较好地解释了克拉苏构造带构造圈闭平面展布格局。Abstract: The structure of the Kelasu structural belt in Tarim Basin is very complex. After more than 30 years of petroleum exploration and development, the problems of unclear structure distribution and unimplemented structural traps are still very prominent. Through a large number of 3D seismic data structure interpretation and modeling and real drilling data, it is discovered that the Kelasu structural belt has the characteristics of sectioned layered deformation and plane geese distribution. Two coordinated deformation mechanisms of the Kelasu structural belt are proposed, which explain the differential deformation phenomenon of the three structural layers of upper salt, center salt and lower salt under the adjustment of the gypsum salt layer. Combining remote sensing images and gravity anomaly images to analyze the coupling relationship between basins and mountains, the differential uplift nappe in South Tianshan orogenic belt, the blocking effect of the Wensu, Xinhe and Yaha paleo-uplifts in the south and the adjustment effect of the Paleogene gypsum-salt layer are the three main influencing factors of deformation, and based on this, the plane distribution pattern of structural traps in the Kelasu structural belt is well explained.
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