ANALYSIS OF STRUCTURE MODEL AND FORMATION MECHANISM OF FUSHA STRUCTURE ZONE IN SOUTHWESTERN DEPRESSION OF TARIM BASIN

doi:10.3863/j.issn.1674-5086.2011.01.008

西南石油大学学报(自然科学版) ›› 2011, Vol. 33 ›› Issue (1): 42-48.DOI: 10.3863/j.issn.1674-5086.2011.01.008

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ANALYSIS OF STRUCTURE MODEL AND FORMATION MECHANISM OF FUSHA STRUCTURE ZONE IN SOUTHWESTERN DEPRESSION OF TARIM BASIN

ZHANG Wei1，2 QI Jia-fu1，2LEI Gang-lin3 WEI Wei3 ZENG Xiang-zhou4

1.State Key Laboratory of Petroleum Resource and Prospecting，China University of Petroleum，Changping Beijing 102249，China；2.College of Geosciences，China University of Petroleum，Changping Beijing 102249，China；3.Research Institute of Exploration and Development，Tarim Oil Company，CNPC，Korla Xinjiang 841001，China；4.Korla Institute，BGP，CNPC，Korla Xinjiang 841001，China

Received:1900-01-01 Revised:1900-01-01 Online:2011-02-20 Published:2011-02-20

Abstract

Abstract: Fusha structure zone in Southwestern Depression of Tarim Basin is the first row of thrustfold zones next to west Kunlun Mountain.The thick Quaternary loess in shallower level and complex thrustfold deformation in deeper level make it difficult to interpret the structure and the final structural model is of ambiguity.On the basis of areal tectonic background，geological data，drilling and seismic data，the structural interpretation model of Fusha structure zone is discussed，and conclusion is thrustfold in the shallower level detached on top of the saltgypsum rock of the Upper Cretaceous and Paleocene，but the deeper layer under the saltgypsum rock develops a set of thrusts and assembles to a wedge imbricate fan.The tailing fault in the imbricate fan is a basementinvolved thrust with middlehigh angle，and could be the master thrust as a result of preexisting regional normal fault inverted.The model of “delaminating contraction and vertically stacking” could be more reasonable to explain the acceptable and trusty structural information in the seismic profile.Inverted normal faults separate Fusha structural zone and west Kunlun folded orogenic zone in horizontal direction.Cenozoic structure in shallower level and Mesozoic structure in deeper level is separated by the saltgypsum rock.West Kunlun Mountain uplift from Neocene to Quaternary，promoting the deeper level of west Kunlun Mountain extruding to southwestern Depression of Tarim Basin，impelling the preexisting normal faults to invert and controlling the formation and evolution of Fusha structure zone.

Key words: structure explanation, inverted normal fault, wedged imbricate thrust zone, Fusha structure zone, Southwestern Depression of Tarim Basin. 

CLC Number:

TE121

ZHANG Wei; QI Jia-fu;LEI Gang-lin WEI Wei ZENG Xiang-zhou. ANALYSIS OF STRUCTURE MODEL AND FORMATION MECHANISM OF FUSHA STRUCTURE ZONE IN SOUTHWESTERN DEPRESSION OF TARIM BASIN [J]. 西南石油大学学报(自然科学版), 2011, 33(1): 42-48.

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ANALYSIS OF STRUCTURE MODEL AND FORMATION MECHANISM OF FUSHA STRUCTURE ZONE IN SOUTHWESTERN DEPRESSION OF TARIM BASIN

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