柴达木盆地阿拉尔断层几何学、运动学及其演化

发布时间：2018-04-01 07:56

本文选题：柴达木盆地　切入点：阿拉尔断层　出处：《大地构造与成矿学》2017年03期

【摘要】：柴达木盆地多个油气田发现于阿拉尔断层上、下盘地层,阿拉尔断层几何学、运动学及其演化特征对深入研究油气成藏规律具有重要意义。本文利用地震资料阐述阿拉尔断层几何学构造样式,提出断点移动法在垂向、横向和沿断面三向定量解释阿拉尔断层各时期移动距离、移动速率和移动角度,综合分析断层几何学和运动学进而探讨断层的演化特征。研究发现阿拉尔断层几何学构造样式具有分段性,各分段具有不同的运动类型,断层西段主要以抬升-挤压为主,断层中段出现明显的走滑-推覆特征,东段为断层上盘抬升及走滑运动所形成的派生断层。阿拉尔断层运动学特征具有多样性、分段性和推覆-抬升交互式。阿拉尔断层的整个演化过程经历了抬升、挤压、走滑、推覆等多种运动类型,正是在这种演化背景下,阿拉尔断层几何学和运动学在不同时期和不同位置存在多样性和分段性。
[Abstract]:Many oil and gas fields in Qaidam Basin are found on the Alar fault, the lower layer, the geometry of the Alar fault, the kinematics and their evolution characteristics are of great significance for the further study of the oil and gas accumulation law.In this paper, the geometries of Alar fault are described by seismic data, and the method of fault point movement is proposed to quantitatively explain the distance, velocity and angle of movement of the Alar fault in three directions: vertical, lateral and along the section.Fault geometry and kinematics are comprehensively analyzed and the evolution characteristics of faults are discussed.It is found that the geometric structural style of the Alar fault is segmented, each segment has different movement types, the west part of the fault is mainly uplift and compression, and the middle part of the fault has obvious strike-slip and nappe characteristics.The eastern segment is a derivative fault formed by the uplift and strike-slip movement of the upper face of the fault.The kinematic characteristics of Alar fault are diverse, piecewise and nappe-uplift interactive.The whole evolution process of Alar fault has experienced many kinds of motion types, such as uplift, compression, strike-slip, nappe and so on. It is in this evolutionary background that the geometry and kinematics of Alar fault are diversified and segmented in different periods and different positions.
【作者单位】：西北大学大陆动力学国家重点实验室/地质学系;
【基金】：国家自然科学基金(41372129) 中国地质调查局“非常规能源矿产调查评价”基础地质调查计划项目(12120113040700) 中国石油天然气股份有限公司青海油田分公司科技项目(研究院2014-技术-勘探-07)联合资助
【分类号】：P542;P618.13

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