Unconformities formed during the P-T transition in the northwestern Junggar Basin: Nature, evolution and implications
Li Pan1, Li Yong-Qiang2, Jing Jian-Bo3, Cao Zheng-Lin1, Yuan Xuan-Jun1
1 Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China; 2 Urümqi Branch,Geophysical Research Institute,BGP,CNPC, Urümqi 830016,China; 3 Geological Research Institute of Western Drilling,CNPC,Xinjiang Karamay 834000,China
Abstract：Late Permian to Early Triassic represents a significant transition period of the Junggar Basin,resulting in the formation of widespread characteristic unconformities. In this paper,the nature,evolution and implications of these unconformities in the northwestern Junggar Basin are explored,based on seismic and borehole data. This study shows that during the P-T transition two main phases of unconformities were present in the study area,including P3/P2 and T1/P3,with the former expressed mainly as a major angular unconformity and later as a minor parallel or sub-parallel unconformity. Noticeably,the two unconformities are amalgamated to form a superimposed one beneath the Lower Triassic in the north,whereas in the south they co-exist with the Upper Permian in between. Their evolution is characterized by four distinct stages: formation of the major unconformity,its partial onlapping by the Upper Permian,formation of the minor and superimposed unconformity,and their onlapping by the Triassic. The nature and evolution of these unconformities help elucidate the relative influence of the late-stage Hercynian and early-stage Indosinian orogenies,the wedge-shaped connotation of stratigraphic record,and the assignment of tectonic sequences to the Upper Permian and Lower Triassic. The results from this study also indicate that the unconformities and relevant stratigraphy during the P-T transition comprise favorable oil-gas migration pathways,reservoir-seal assemblages and various traps,and are thus of great significance for hydrocarbon exploration.
Li Pan,Li Yong-Qiang,Jing Jian-Bo et al. Unconformities formed during the P-T transition in the northwestern Junggar Basin: Nature, evolution and implications[J]. JOPC, 2020, 22(4): 697-714.
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