用离散元数值模拟法研究克拉苏构造带盐构造变形机理

发布时间：2018-05-27 20:02

本文选题：塔里木盆地 + 库车坳陷　；参考：《新疆石油地质》2017年04期

【摘要】：为研究库车坳陷克拉苏构造带盐构造挤压变形演化过程及其主控因素,采用离散元数值模拟方法,模拟了阿瓦特段、大北段和克深段3条主干地震剖面的盐构造变形演化过程。离散元数值模拟结果表明,挤压背景下盐岩层表现为塑性变形特征,具有较强的流动性,盐上层、盐岩层和盐下层为整体挤压、分层变形的构造特征;盐下层发育一系列由北向南的冲断构造,盐上层发育断层传播褶皱和滑脱变形构造;先存断裂主要控制盐下层构造变形和应力的传播范围;先存盐底辟主要影响盐上层构造的隆升范围,盐岩展布形态和基底古隆起主要影响盐上层构造变形。研究结果揭示了克拉苏构造带盐构造的动力学演化过程,有利于提高对盐构造变形机理和演化过程的认识。
[Abstract]:In order to study the evolution process of salt structure compression deformation and its main controlling factors in Klassou structural belt of Kuqa depression, the evolution process of salt tectonic deformation in three main seismic sections of Abat section, Dazhong section and Keshan section was simulated by using discrete element numerical simulation method. The numerical simulation results of discrete element show that the salt strata show plastic deformation characteristics, and have strong fluidity, the upper salt layer, salt rock layer and lower salt layer are whole extruded and stratified deformation. A series of thrust structures from north to south are developed in the lower salt layer, and fault propagation fold and slip deformation structures are developed in the upper salt layer, while the pre-existing faults mainly control the spreading range of the tectonic deformation and stress in the lower salt layer. The pre-salt diapir mainly affects the uplift range of the upper salt structure, and the distribution of salt rock and the paleouplift of the basement mainly affect the deformation of the upper salt structure. The results reveal the dynamic evolution of the salt structure in the Klassou structure, which is helpful to improve the understanding of the deformation mechanism and evolution process of the salt structure.
【作者单位】：中国石油塔里木油田分公司勘探开发研究院;北京大学地球与空间科学学院;
【基金】：国家973项目(2009CB219302)
【分类号】：P618.13

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