
Tectono-stratigraphic sequence and basin evolution in West Depression of Junggar Basin
Shuzheng YIN, Wenjian GUO, Xinning LI, Zhichao ZHOU, Wenhui LIU, Lixin JIAO, Dengfa HE
Tectono-stratigraphic sequence and basin evolution in West Depression of Junggar Basin
Mahu sag,Shawan sag,and Pen-1 well west sag are the three major hydrocarbon rich sags in the west of Junggar Basin. Through the analysis of deep drilling wells,well logging,and deep reflection seismic profile data,these three sags were revealed to belong to the same depression in the early Permian,and the scope of the Western Depression of the Junggar Basin was determined accordingly. Three sets of regional unconformity surfaces were identified and three sets of structural layers were divided in the Permian to the upper Triassic within the Western Depression, i.e. ,the lower Permian structural layer,the middle Permian structural layer,and the upper Permian-Triassic structural layer. The fault related fold theory and balanced profile technique are used in the fine tectonic interpretation and tectonic evolution analysis. In combination with the previous analysis on thermal history and geochemical characteristics of volcanic rocks in the Junggar Basin,the tectonic evolution of the Western Depression in the Permian-Triassic period was mainly divided into three stages: the extensional rifting of the early Permian and the compression in the late Permian,the weak extensional depression of the Middle Permian,the compression uplift of the late Permian to Triassic period. The tectonic evolution of the western depression belt is spatiotemporally coupled with the anti-clockwise rotation of the western Junggar and Junggar Block. These results are of great significance for revealing the characteristics of the Junggar Basin during the Permian period and the evolution of intracontinental processes since the Permian period.
West Depression / tectono-stratigraphic sequence / unconformity / basin evolution / Junggar Basin
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