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季刊,2016年6月创刊
主管:教育部
主办:中国石油大学(北京)
   清华大学出版社有限公司
出版:清华大学出版社有限公司
编辑:《石油科学通报》编辑部
主编:陈勉
地址:北京市海淀区学院路20号院
   902信箱中国石油大学期刊社
邮编:100083
电话:010-82377349
         010-89734040
E-mail:bops@vip.163.com
     本刊导读
The Mahu sag in the northwestern margin of the Junggar Basin is one of the most important hydrocarbon-rich sags  
in the Junggar Basin. The understanding of basin attributes and tectonic evolution of the Junggar Basin during the Permian-early  
Triassic is significant for oil and gas exploration and development. The Permian to early Triassic terrestrial successions in the  
Mahu sag record the tectonic evolution of the northwestern margin of the Junggar Basin. Comprehensive studies of structures,  
sequence stratigraphy, sedimentary infill, sediment dispersal and paleogeographic construction were performed on the  
Permian-early Triassic successions. 2D seismic profiles show the occurrences of basin-bounding normal faults and half-graben  
structures during the Early Permian and the tectonic inversion during the late Permian to early Triassic. Widespread soft-sediment  
deformation structures in the lower Permian Fengcheng Formation with lateral continuity correspond with the main activity on  
basin-bounding normal faults. The Permian to Triassic strata are organized into two second-order transgressive-regressive (T-R)  
sequences. During the early Permian, sediments of transgressive systems tracts 1 recorded depositional system transition from
fan delta to deep lacustrine setting, and the depocenter was distributed along the boundary normal fault. At this time, tectonic  
mechanical subsidence exceeded sediment supply. During the middle Permian, the depositional system of regressive system  
tracts 1 transitioned from lacustrine to fan delta setting, and the location of the depocenter shifted to the center of the Mahu sag,  
where thermal subsidence played a great role. During the late Permian-early Triassic, fan-deltas were distributed along the Hong
Che, Ke-Bai and Wu-Xia fault zones. Therefore, three stages of the tectonic evolution of the Permian-early Triassic Mahu in the  
northwestern margin of Junggar Basin are recognized: early Permian syn-rift mechanical subsidence, middle Permian post-rift  
thermal subsidence, and late Permian to early Triassic tectonic inversion. The dynamic mechanism of the tectonic evolution of  
the northwestern margin of the Junggar Basin is consistent with the evolutionary pattern of the late Paleozoic post-accretionary  
orogenic stage in the southwestern margin of the Central Asian Orogenic Belt .


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