石油与天然气地质 ›› 2011, Vol. 32 ›› Issue (3): 440-447.doi: 10.11743/ogg20110317

• 石油与天然气地质 • 上一篇    下一篇

塔里木盆地轮南低凸起构造特征及演化

  

  • 出版日期:2011-06-28 发布日期:2011-09-23

Structure features and its evolution of Lunnan low uplift, the Tarim Basin

  • Online:2011-06-28 Published:2011-09-23

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871

被引次数

25

摘要：

摘要：轮南低凸起是位于塔里木盆地塔北隆起上的一个多套含油层系共存的巨型复式油气聚集区，油气储量丰富。自形成以来,轮南低凸起经历了多期复杂的构造运动。通过精细的二维地震测线解释，根据地震剖面上的削截、上超等反射特征，在该区共识别出11个重要的不整合面以及轮台、轮南、桑塔木等6条主要的断裂。这些断裂早期主要为逆冲断裂，主要活动时期为晚海西—印支期，强烈活动期为二叠纪，该认识有别于前人认为的断裂发育期为晚加里东—早海西期。之后的构造反转作用发生在古近纪末期，与前人研究结果相一致。通过构造演化剖面确定该区主要经历了五大演化阶段。在这些阶段中，晚海西—印支期发生的强烈挤压、抬升、剥蚀作用对研究区面貌影响最大，喜马拉雅期受印度板块向欧亚板块的快速楔入影响，研究区地层发生翘倾，由原来的南低北高转变为现今南高北低的形态，研究区面貌最终定型。

关键词: 关键词：构造演化, 构造反转, 剥蚀量恢复, 轮南低凸起, 塔里木盆地

Abstract:

Abstract:Lunnan low uplift,located in Tabei uplift of the Tarim Basin,is a huge complex play fairway with multiple oilbearing layer series and large hydrocarbon reserves.Lunnan low uplift has undergone multistage complex tectonic movement since its formation.According to the fine interpretation of twodimensional seismic lines and the reflectance signature of the truncation and onlap on seismic profiles,this paper identifies 11 important unconformities and six major faults including Luntai,Lunnan,Sangtamu,etc.These faults were mainly thrusts at early stage,and they kept active in the Late HercynianIndosinian period and their activity peaked during the Permian.This is different from the previous suggestion that the faults were developed in the Late CaledonianEarly Hercynian.Tectonic inversion occurred at the end of Paleogene,and this is consistent with previous studies.Tectonic evolution profiles show that the study area mainly goes through five stages of tectonic evolution.Among these 5 stages,the Late HercynianIndosinian was a period when intense compression,uplifting and erosion occurred and exerted great effect on the features of the study area.While in the Himalayan period,strata of the study area were tilted and changed from previously “low in the south and high in the north” to nowadays “high in the south and low in the north” due to the rapid wedging of Indian Plate into Eurasian Plate,and the features of the study area were finalized.

Key words:  , Key words： tectonic evolution,tectonic inversion,denudation reconstruction,Lunnan low uplift,Tarim Basin