库车褶冲带博孜敦底辟新生代盐构造变形期次:来自盐动力层序的证据

发布时间：2018-03-27 13:42

本文选题：盐动力层序　切入点：变形期次　出处：《大地构造与成矿学》2016年05期

【摘要】：盐动力层序是指被动盐底辟周缘发育的一套角度不整合地层,是识别盐盆地早期被动底辟的标识。库车地区盐构造由于被上新世区域大规模挤压事件显著破坏,其古新世中新世的早期演化过程尚存在争议。本文首次将盐动力层序的研究方法运用在库车地区盐构造研究中,并通过对库车褶冲带的博孜敦盐底辟进行野外观察、地层恢复、地震解译后发现,库车地区博孜敦盐底辟南西翼渐新统中新统发育一套与盐底辟活动相关的沉积层序,小层序之间以角度不整合为界,但随着远离底辟地层之间的接触关系很快变为整合接触,符合直立状复合型盐动力层序的模型。由此认为,库车地区早期被动盐底辟发育,盐构造的演化变形可分为两个期次:早期被动底辟期(渐新世上新世早期)与后期挤压改造期(上新世现今)。通过对比物理模拟结果与地震资料解译结果认为,库车地区早期被动底辟作用很可能受控于始新世以来的冲积扇沉积加载作用。
[Abstract]:The salt dynamic sequence refers to a set of angular unconformities developed around the passive salt diapir, which is the mark of identifying the passive diapir in the early salt basin. The salt structure in Kuqa area was significantly destroyed by the Pliocene regional massive compression events. The early evolution process of the Paleocene and Miocene is still controversial. In this paper, the method of salt dynamic sequence is applied to the study of salt structure in Kuqa area for the first time, and the field observation is carried out on the Borzidon salt diapir in Kuqa fold thrust belt. After stratigraphic restoration and seismic interpretation, it was found that a set of sedimentary sequences related to the activities of salt diapir were developed in the Miocene of the Oligocene in the southwestern wing of the salt diapir in Kuqa area, and the angle unconformity was taken as the boundary between the small sequences. However, as the contact relationship between diapir strata becomes integrated contact quickly, it accords with the model of vertical composite salt dynamic sequence. It is concluded that the early passive salt diapir developed in Kuqa area. The evolution and deformation of salt structures can be divided into two stages: the early passive diapir period (Oligocene early Pliocene) and the late compression transformation period (Pliocene). The early passive diapir in Kuqa area was probably controlled by alluvial fan loading since Eocene.
【作者单位】：中石油东方地球物理公司研究院库尔勒分院;浙江大学地球科学学院;教育部含油气盆地构造研究中心;
【基金】：国家重大专项(2011ZX05009-001) 库车前陆深层油气地质理论与勘探目标评价(2014E-2101)联合资助
【分类号】：P542

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