新疆北部阿尔泰-东准噶尔地区深地震反射剖面资料深度偏移成像研究

新疆北部阿尔泰-东准噶尔地区位于中亚造山带西南缘。中亚造山带由古岛弧与微陆块拼贴而成，经历了汇聚、挠曲和俯冲等多次地壳增生活动，岩浆活动强烈，成矿作用显著。为了揭示阿尔泰-东准噶尔地区盆山结构和矿体延伸，2018年我们在该区域获得了一条横跨喀拉通克矿集区的深地震反射剖面。针对当前精细处理时偏移成像限于双程时间剖面、地震数据只使用相对振幅、无衰减补偿使深部信息匮乏等弱点，我们提出将深地震反射剖面振幅数据从电压值转化为地面运动速度，通过引入衰减补偿，建立粘弹性波动方程叠前深度偏移成像模型，推测喀拉通克矿集区深部的矿体延伸，以期获得矿集区的深部成矿机制；查明阿尔泰造山带与东准噶尔地块的接触关系，为区域构造演化研究和发展增生造山的成矿动力学理论提供精细约束。

The Altai-East Junggar region in northern Xinjiang province is located in the southwestern margin of the Central Asian orogenic belt. The Central Asian Orogenic Belt is an orogenic belt composed of ancient island arc and micro-continental block, flexion and multiple crustal accretion. It has strong magmatic activity and obvious mineralization. In order to reveal the basin-mountain structure and vein extension in the Altai-East Junggar area, a deep seismic reflection profile across the Karatongke ore concentration area was obtained in 2018. In view of the weaknesses of the current fine processing time migration imaging, such as limited to two-way time profiles, using only relative amplitude of seismic data and less deep information without attenuation compensation, we propose to transform the amplitude data of deep seismic reflection profiles from voltage values to ground motion velocities. By introducing attenuation compensation, a pre-stack depth migration imaging model of viscoelastic wave equation is established to speculate the Karatonke mineral accumulation. The deep structure of the ore body extends in order to obtain the deep mechanism of the ore concentration area, and to find out the structural contact relationship between the Altai orogenic belt and the East Junggar massif, so as to provide fine constraints for the study of regional tectonic evolution and the development of the metallogenic dynamics theory of accretion orogeny.