Sedimentary evolution and main controlling factors of shallow water delta of the Lower Jurassic in Dongdaohaizi sag,Junggar Basin
ZHU Qing1, LIU Shengqian1, ZHU Xueqing1, LIU Bin1, ZENG Zhiping2, LI Songtao2, GAO Yangjun2
1 School of Geosciences,Yangtze University,Wuhan 430100,China; 2 Exploration and Development Institute of Sinopec Shengli Oilfield Company,Shandong Dongying 257015,China
Abstract：A shallow water delta was developed in the Lower Jurassic period in the Dongdaohaizi sag,Junggar Basin,but its sedimentary evolution and main controlling factors were not fully understood. Through the analysis of well logging,core and geochemical data from the Dongdaohaizi sag and its surrounding areas,the sedimentary facies,paleogeomorphology and paleoclimate of this region were analyzed. The study identified three subfacies within the shallow water delta: delta plain,inner front,and outer front. The delta plain subfacies consisted mainly of distributary channels,forming glutenite layers over a hundred meters thick. The inner front featured medium-fine sandstone with argillaceous interlayers,while the outer front was mainly composed of sheet sandstone microfacies interbedded with mudstone and argillaceous siltstone. The paleogeomorphology of the area was higher in the east and lower in the west,categorized into paleo-highland,paleo-slope and paleo-depression based on relative positions and slopes. Analysis of geochemical indicators and sedimentary characteristics suggested fluctuations between humid and arid conditions during the Early Jurassic,with the lake level experiencing three progression-regression cycles. The progradation and regradation of the delta extended over tens of kilometers with the sedimentary distribution and evolution influenced by both paleogeomorphology and paleoclimate. The gentle overall paleogeomorphology provided a foundation for shallow water delta development,while regional paleogeomorphology height and evolution affected sedimentary system distribution and transition. Alternating dry and wet paleoclimate conditions affected lake level fluctuations,thereby controlling delta progradation and regradation. Through a comprehensive analysis,the progradational and regradational depositional models were established for shallow water delta sedimentary patterns,offering valuable insights into the impact of paleogeomorphology and paleoclimate on shallow water delta,and serving as a reference for future exploration in the area.
ZHU Qing,LIU Shengqian,ZHU Xueqing et al. Sedimentary evolution and main controlling factors of shallow water delta of the Lower Jurassic in Dongdaohaizi sag,Junggar Basin[J]. JOPC, 2024, 26(3): 567-583.
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