塔里木盆地乌什凹陷晚新生代构造变形特征与油气
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摘要
基于高分辨率二维地震反射剖面地质解释,认为晚新生代塔里木盆地乌什凹陷具"对冲"构造变形特征.凹陷北侧为南天山冲断体系,自北向南逆冲,主冲断层为神木园断裂,前锋断层为下塔尕克断裂.凹陷南侧为温宿凸起反冲断层体系,自南向北逆冲,主冲断层为古木别兹断裂.由于基底对冲,上覆沉积盖层沿中新统吉迪克组底部和古近系膏盐层向南北两侧滑脱,形成一大型向斜构造,造成深、浅构造层变形差异明显.构造变形开始于上新世库车组沉积期,第四纪加剧,为印藏碰撞"远距离效应"的结果,其对晚新生代构造圈闭发育和油气运移具重要控制作用.
Based on new high-resolution seismic profiles,a opposite thrust structural deformation features for late Cenozoic Wushi Sag of northwestern Tarim Basin,northwestern China is proposed in this paper.To the north of the sag is the Southern Tianshan thrust system,of which the faults thrust from the north to the south,the main thrust fault is Shenmuyuan fault,and the front thrust fault is Xiatagake fault;To the south of the sag is the Wensu uplift backthrust system,of which the faults thrust from the south to the north,and the main thrust fault is Gumubiezi fault.Moreover,there develops one detached fault along the gypsum layer on me bottom of Neogene or Paleogene because of the opposite thrust of basement.As a result,the Cenozoic in Wushi area fold a down.Thus,the Wushi sag is in fact a syncline,and the structural deformation is at all different below or on the detached fault above.The structural deformation,happened mainly in the sedimentary period of Kuche Formation of Neogene,and became stronger in the Quaternary,and is the result of collision between India and Asia continents,which has controlling influence on structural trap and petroleum migration of late Cenozoic.
Based on new high-resolution seismic profiles,a opposite thrust structural deformation features for late Cenozoic Wushi Sag of northwestern Tarim Basin,northwestern China is proposed in this paper.To the north of the sag is the Southern Tianshan thrust system,of which the faults thrust from the north to the south,the main thrust fault is Shenmuyuan fault,and the front thrust fault is Xiatagake fault;To the south of the sag is the Wensu uplift backthrust system,of which the faults thrust from the south to the north,and the main thrust fault is Gumubiezi fault.Moreover,there develops one detached fault along the gypsum layer on me bottom of Neogene or Paleogene because of the opposite thrust of basement.As a result,the Cenozoic in Wushi area fold a down.Thus,the Wushi sag is in fact a syncline,and the structural deformation is at all different below or on the detached fault above.The structural deformation,happened mainly in the sedimentary period of Kuche Formation of Neogene,and became stronger in the Quaternary,and is the result of collision between India and Asia continents,which has controlling influence on structural trap and petroleum migration of late Cenozoic.
引文
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[15]吕修祥,金之钧,周新源,等.塔里木盆地乌什凹陷温宿凸起油气勘探前景[J].中国石油大学学报(自然科学版),2006,30(1):17-25.
[16]周兴熙,贾进华,周东延,等.库车坳陷乌什凹陷东部成藏作用初步研究[J].石油勘探与开发,2006,33(2):184-188.
[2]何登发,贾承造,李德生,等.塔里木多旋回叠合盆地的形成与演化[J].石油与天然气地质,2005,26(1):64-77.
[3]何治亮,罗传荣,龚铭,等.塔里木多旋回盆地与复式油气系统[M].北京:中国地质大学出版社,2001,8-18..
[4]贾承造.中国塔里木盆地构造特征与油气[M].北京:石油工业出版社,1997,348-357.
[5]贾承造,姚慧君,高杰,等.塔里木盆地地层系统研究[A].塔里木盆地油气地质研究进展[C].北京:科学出版社,1992,34-63.
[6]张师本,倪寓南,龚福华.等.塔里木盆地周缘地层考察指南[M].北京:石油工业出版社.2003,9-123.
[7]Windley B F,Allen M B,Zhang C,et al.Paleozoic accretion and Cenozoic redeformation of the Chinese Tian Shah Range,central Asia[J].Geology,1990.18:128-131.
[8]汤良杰.塔里木盆地构造演化与构造样式[J].地球科学,1994,19(6): 742.754.
[9]Mattern F,Schneider W.Suturing of the Proto- and Paleo-Tethys oceans in the western Kunlun(Xinjiang,China)[J].J.of Asian Earth Sciences, 2000,18:637-650.
[10]Wang Z H.Structure evolution of the western Kunlun orogenic belt, western China[J].J of Asian Earth Sciences,2004,24:153-161.
[11]Chen C M,Lu H F Jia D,Cai D S,et al.Closing history of the soudiern Tianshan oceanic basin,western China an oblique coltisional orogen[J]. Tectonophysics,1999,302:23-40.
[12]Sobel E R,Dumitru T A.Thrusting and exhumation around the margins of the western Tarim basin during the India-Asia collision.J.[J] Geophys.Res.1997,102:5043-5063.
[13]Suppe J.Geometry and kinematics of fault-bend folding[J].American Journal of Science,1983,283(9):684-721.
[14]Suppe J,Medwedeff D A.Geometry and Kinematics of fault-propagation folding[J].Eclogai Geoligicae Helvetiae,1990,83(3):409-454.
[15]吕修祥,金之钧,周新源,等.塔里木盆地乌什凹陷温宿凸起油气勘探前景[J].中国石油大学学报(自然科学版),2006,30(1):17-25.
[16]周兴熙,贾进华,周东延,等.库车坳陷乌什凹陷东部成藏作用初步研究[J].石油勘探与开发,2006,33(2):184-188.
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