Distribution and Controlling Factors of Remnant Middle-LowerJurassic in the Eastern Qaidam Basin
Received date: 2014-11-29
Revised date: 2015-01-15
Online published: 2015-10-10
Middle and Lower Jurassic are main hydrocarbon generation layers in the eastern Qaidam Basin.It is used to being widely accepted that broad basin was developed during the Early-Middle Jurassic,and residual strata can be found in each sag at present.However,these ideas don't meet well with drilling practice.In face of such situation,the author made full use of field survey,drilling data,seismic data,and electric survey results,analyzed time correlation and lateral variation of outcrops,and studied original sedimentary system and distribution rules of residual strata.It is pointed out that during the Early-Middle Jurassic there developed four separated lake basins instead of broad basin namely Yuka,Hongshan,Delingha and Huobuxun,and Mahai paleohigh and Oulongbuluke low uplift separated the original lake basin into several small ones.Residual strata of Middle-Lower Jurassic were limited in sags such as Gaxi,Yuka,Hongshan,Xiaochaidan,Huobuxun,and Delingha,etc.Residual strata were developed in both sag area and piedmont thrust belt,but not correspond with present sags,such strata were not found in Ounan Sag and Dachaidan Sag,for instance.Distribution of residual strata was mainly controlled by the development of original sedimentation and reconstruction of uplift during Late Yanshan Movement.Laterally,residual strata distribution was strictly confined by NW striking mountain-controlling faults and sag-controlling faults such as South Qilian fault and Ainan fault,and NE striking or EW striking accommodation faults such as Maxian fault.Coupled influence of big faults and accommodation faults resulted in difference in development of residual strata between two walls of a fault and among sags.
LI Jun-liang，XIAO Yong-jun，LIN Wu，CHAI Xian-ping，ZHANG Jun-feng . Distribution and Controlling Factors of Remnant Middle-LowerJurassic in the Eastern Qaidam Basin[J]. Natural Gas Geoscience, 2015 , 26(10) : 1893 -1900 . DOI: 10.11764/j.issn.1672-1926.2015.10.1893
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