包裹体测温恢复剥蚀厚度新方法在准噶尔盆地车—莫古隆起的应用  

Using a New Method Based on Homogeneity Temperature of Fluid Inclusion to Restore the Thickness of Eroded Strata of Che-Mo Paleo-Uplift in Junggar Basin

作　　者：史长林[1] 纪友亮[1] 李清山[1] 刘德宏 

机构地区：[1]中国石油大学资源与信息学院,北京102249 [2]中石油东方地球物理公司国际部,河北涿州072751

出　　处：《吉林大学学报（地球科学版）》2011年第1期64-70,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家'973'计划项目(2006CB202302)

摘　　要：准噶尔盆地车—莫古隆起侏罗系顶部和白垩系底部之间发育剥蚀面(K/J不整合),恢复古隆起剥蚀厚度是盆地分析的重要研究内容之一。在广泛分析各种剥蚀厚度恢复方法适用性的基础上,结合该区埋藏史和地温史分析,提出了包裹体测温恢复剥蚀厚度的新方法;其基本原理是利用古隆起开始抬升时形成的包裹体与抬升剥蚀结束时形成的包裹体的均一化温度差和古地温梯度,计算剥蚀量。用该方法恢复了车—莫古隆起的剥蚀厚度,沙1井和盆4井的剥蚀厚度分别为390～438m和361～406m。包裹体测温恢复剥蚀厚度的计算方法简单,关键是要通过埋藏史、地温史分析和镜下观察包裹体发育部位等综合手段,找到地层抬升开始前和抬升结束时形成的包裹体。该方法适用于后期沉积厚度远大于剥蚀厚度或经历了多期构造运动发育多个不整合面的剥蚀厚度恢复。Restoration of the thickness eroded strata in Cretaceous/Jurassic（K/J） unconformity of Che-Mo paleo-uplift in Junggar basin is an important work for basin analysis.Based on the investigation to the methods of eroded thickness restoration,a new approach using homogeneity temperature of fluid inclusions is proposed with the burial history analysis and paleo-temperature history analysis in the area.The principle of the new method is using the differences between the homogeneity temperatures of fluid inclusions which formed when Che-Mo paleo-uplift began to rise and which formed after the erosion finished.These differences can be used to calculate eroded thickness easily.By the new method the eroded thickness in Sha 1 and Pen 4 well is 390-438 m and 361-406 m respectively.The key of the method is to separate the fluid inclusions that formed before the uplift began to rise from those that formed after the rising finished.The method can be used to restore the eroded thickness where the deposition thickness above erosion plane is larger than the eroded thickness or the eroded strata experienced multi-stage tectonic movements and developed many unconformities.

关 键 词：准噶尔盆地 车-莫古隆起 剥蚀厚度 流体包裹体 均一化温度 地温梯度 

分 类 号：P618.13[天文地球—矿床学]