库车坳陷盐下构造对盐上盖层变形的影响因素分析
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摘要
库车坳陷是在地壳或者岩石圈尺度整体挤压作用下,收缩构造变形形成的一个构造单元,膏盐岩层等软弱岩层可能导致滑脱断层发育,并引起盐上和盐下不协调收缩变形,区域挤压作用下一些先存基底断裂带的逆冲位移是控制盐上层冲断褶皱变形的主要因素。运用地震资料、地表露头、钻测井资料以及非地震资料等,对库车坳陷区域大剖面的盐上层、盐下层的构造变形样式进行分析,认为南天山在挤压收缩变形中隆升,诱导盆山过渡带发育基底卷入的高角度逆冲断层,先前基底断层的复活影响了盆地沉积盖层的构造变形,基底断裂与盖层断层组合样式在走向上基本一致,盖层强变形带与基底断裂带上下呼应。
The shrinkage deformation in Kuqa depression has occurred in the integral extrusion of earth's crust or lithosphere scale.Weak rock layers such as plaster-salt layers may lead to local detachment faults.The contraction deformation between the upper salt layers and the lower salt layers is uncoordinated.Under the regional squeeze of some pre-existing basement fault zones,thrust displacement is the main factor to control cap rock of thrust fold deformation.The seismic data,surface outcrop,drilling and logging data and non-seismic data are used to analyze the upper and the lower salt layers of tectonic deformation styles in Kuqa depression.The results show that South Tianshan was uplifted during the squeeze deformation,and thus inducing high angle thrust faults of basement involved between the basin and the mountain transition zone.The resurrection of previous basement faults led to the tectonic deformation in cap rock,the combination styles of basement faults and cap rock faults almost the same on the go,the overlying strong deformation belts of cap rock and the underlying basement fault zones corresponded with each other.
引文
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