Depositional systems and their controlling factors of the Lower Jurassic Sangonghe Formation in southern Junggar Basin
JIAO Guohua1, ZHANG Weiping1, XIE Lihua2, WANG Jun1, ZHOU Jinke1, WANG Yunhai1
1 Xinjiang Xinchun Petroleum Development Co.Ltd.,Sinopec,Shandong Dongying 257000,China; 2 Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences,Peking University,Beijing 100871,China
Abstract：The Sangonghe Formation is the main production unit of the southern Junggar Basin,but the provenance,sedimentary facies,and their controlling factors remain poorly resolved. In this paper,the 4th sequence-stratigraphic framework of the Sangonghe Formation was investigated based on outcrops,well logging,cores,and seismic data. The results suggest that the provenance change,the palaeogeomorphic evolution,the tectonic and palaeoclimate conditions controlled sedimentary patterns and filling process in the southern Junggar Basin during the Early Jurassic. The Junggar Basin formed under a relatively stable tectonic environment and relatively humid palaeoclimate in the Early Jurassic. There are two sedimentary facies and five sedimentary systems in the central and the eastern of the southern Junggar that was a wide and gentle catchment area in Early Jurassic. One facies is shoal-water baided-river delta,which is divided into four sedimentary systems,respectively,from the Zaire Mountain to the west of Junggar Basin,Halarat Mountain to the northwest of Junggar Basin,Kelamili Mountain to the east of Junggar Basin and Tanshan Mountain to the south of Junggar Basin. The other facies is shoal-water fan delta from the Tianshan Mountain to the south of Junggar Basin. There are two sedimentary facies and two sedimentary systems in the western of the southern Junggar Basin that was a small and sharp catchment area in the Early Jurassic. One faices is Gilbertian shallow-water fan delta from the Tianshan Mountain to the south of Junggar Basin,and the other is shoal-water braided-river delta from the Zaire Mountain to the western Junggar Basin. Controlled by palaeoclimate and depositional base level,the interval 1 of Member 2 of Lower Jurassic Sanggonghe Formation is a lowstand system tract,and the depositional base level is low. The deltas extended further forward,and resulted in sandbodies distributed widely and fining forward. The interval 2 of Member 2 of Lower Jurassic Sanggonghe Formation is a transgressive system tract,and the Member 1 of Lower Jurassic Sanggonghe Formation is a highstand system tract. The range of their deltas distributed smaller than those of the submember 2. Shore-shallow lacustrine deposits were dominant in the Member 1,which were the early sediment of a highstand system tract.
JIAO Guohua,ZHANG Weiping,XIE Lihua et al. Depositional systems and their controlling factors of the Lower Jurassic Sangonghe Formation in southern Junggar Basin[J]. JOPC, 2023, 25(3): 628-647.
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