Deformation Mechanism of Hutubi Anticline in the Southern Margin of Junggar Basin: Insights From Physical Simulation Experiment

摘要/Abstract

摘要： The fold-thrust belts in the southern margin of Junggar basin are characterized by multi-stage superimposition and deformation. The Hutubi anticline located in the front of the thrust is far away from the Tianshan Mountains and shows a double-layer structure, among which the deep layer is a Permian fault-depression-paleohigh and the shallow layer is a fault anticline of Jurassic with its overlying strata. To investigate the main controls on the shallow anticline formation and the vertical deformation mechanism of the Hutubi anticline, 5 groups of models are designed to perform physical simulation study by using control variable and comparative analysis methods on the basis of the identification of structural style and deformation laws. The study results show that the experimental result of the fault-depression-paleohigh model is similar to the seismic interpretation result. As the main controlling factor, the paleohigh in the fault-depression margin induced the overlying strata to deform into anticlines, which can prove the time-space coupling relations between the deep layer and shallow layer in the Hutubi anticline. The shape of the shallow anticline is also controlled by the combination of the scale of the underlying fault-depression, the overlying strata thickness and the syntectonic sedimentation. It is a scientific and effective method to reveal the correlation and deformation mechanism of vertical superimposed structures by using physical simulation experiments, which could provide more basis for petroleum exploration and production in the foreland area of the southern margin of Junggar basin.

关键词: Junggar basin, Hutubi anticline, deformation mechanism, physical simulation, pre-existing fault-depression, paleohigh, overlying strata thickness, syntectonic sedimentation, controlling factor

Abstract: The fold-thrust belts in the southern margin of Junggar basin are characterized by multi-stage superimposition and deformation. The Hutubi anticline located in the front of the thrust is far away from the Tianshan Mountains and shows a double-layer structure, among which the deep layer is a Permian fault-depression-paleohigh and the shallow layer is a fault anticline of Jurassic with its overlying strata. To investigate the main controls on the shallow anticline formation and the vertical deformation mechanism of the Hutubi anticline, 5 groups of models are designed to perform physical simulation study by using control variable and comparative analysis methods on the basis of the identification of structural style and deformation laws. The study results show that the experimental result of the fault-depression-paleohigh model is similar to the seismic interpretation result. As the main controlling factor, the paleohigh in the fault-depression margin induced the overlying strata to deform into anticlines, which can prove the time-space coupling relations between the deep layer and shallow layer in the Hutubi anticline. The shape of the shallow anticline is also controlled by the combination of the scale of the underlying fault-depression, the overlying strata thickness and the syntectonic sedimentation. It is a scientific and effective method to reveal the correlation and deformation mechanism of vertical superimposed structures by using physical simulation experiments, which could provide more basis for petroleum exploration and production in the foreland area of the southern margin of Junggar basin.

Key words: Junggar basin, Hutubi anticline, deformation mechanism, physical simulation, pre-existing fault-depression, paleohigh, overlying strata thickness, syntectonic sedimentation, controlling factor

ZHANG Xichen, MA Delong, WEI Lingyun, WANG Hongbin, WANG Yanjun, LIU Wenqiang, YANG Xiulei. Deformation Mechanism of Hutubi Anticline in the Southern Margin of Junggar Basin: Insights From Physical Simulation Experiment[J]. 新疆石油地质, 2020, 41(zk(English)): 92-100.

参考文献

[1] AVOUAC J P,TAPPONNIER P,BAI M,et al.Active thrusting and folding along the northern Tien Shan and Late Cenozoic rotation of the Tarim relative to Dzungaria and Kazakhstan[J]. Journal of Geophysical Research,1993,98(B4):6 755-6 804.
[2] YANG Disheng,XIAO Lixin,YAN Guihua,et al.Structural characteristics and petroleum exploration in Sikeshu sag,southern margin of Junggar basin[J]. Xinjiang Petroleum Geology,2019,40(2):138-144.
[3] HE Dengfa,LI Desheng,WANG Chengshan,et al.Advances and challenge of structural geology of deep sedimentary basins in China[J]. Earth Science Frontiers,2017,24(3):219-233.
[4] JIA Chengzao,PANG Xiongqi.Research progress and main development directions of deep hydrocarbon geological theories[J]. Acta Petrolei Sinica,2015,36(12):1 457-1 469.
[5] MA Delong,HE Dengfa,WEI Dongtao,et al.Multiple phase deformation of Gumudi anticline at south margin of Junggar basin[J]. Journal of Jilin University(Earth Science Edition),2017,47(6):1 695-1 704.
[6] CHEN Shuping,QI Jiafu,YU Fusheng,et al.Deformation characteristics in the southern margin of the Junggar basin and their controlling factors[J]. Acta Geologica Sinica,2007,81(2):151-157.
[7] LI Zhongquan,ZHANG Shouting,YING Danlin,et al.The characteristics of the structure section in Tuositai region on the south edge of Junggar basin,Xinjiang,China[J]. Journal of Chengdu University of Technology(Science & Technology Edition),2010,37(6):593-598.
[8] MA Delong,YUAN Jianying,ZHANG Huquan,et al.Deep structure analysis of Huoerguosi anticline at the southern margin of Junggar basin based on high-density seismic reflection and sandbox modeling[J]. Journal of China University of Petroleum(Edition of Natural Science),2018,42(6):9-18.
[9] LU Huafu,WANG Shengli,JIA Chengzao.The mechanism of the southern Junggar Cenozoic thrusts[J]. Earth Science Frontiers,2007,14(4):168-174.
[10] YU Fusheng,LI Guozhi,YANG Guangda,et al.Deformation feature and genesis simulation of fold-and-thrust belts in the southern margin,Junggar basin[J]. Geotectonica et Metallogenia,2009,33(3):386-395.
[11] ZHANG Yulan,WANG Weifeng,MA Zongjin.Physical simulation experiment on geological structures in the south of Juggar basin[J]. Journal of the University of Petroleum,China,2003,27(3):1-5.
[12] MA Delong,HE Dengfa,YUAN Jianying,et al.The deep structures in the southern Junggar foreland thrust belt and their control on petroleum accumulation:insights from the Huoerguosi-Manasi-Tugulu fold and thrust belt[J]. Earth Science Frontiers,2019,26(1):165-177.
[13] YU Fusheng,LI Dinghua,ZHAO Jinyong,et al.Physical simulation of double decollements:insights into the fold-and-thrust belt in the southern front of Junggar basin[J]. Journal of Earch Sciences and Environment,2012,34(2):15-23.
[14] ZHOU Jianxun,ZHOU Jiansheng.Mechanism of Cenozoic structural deformation in Bohai Bay basin:physical simulation and discussion[J]. Science in China Series D:Earth Sciences,2006,36(6):507-519.
[15] NENG Yuan,LI Yong,XU Lili,et al.Patterns of fracture zone in the deep subsalt layer of Kelasu structural belt and prospecting method[J]. Geotectonica et Metallogenia,2017,41(1):61-68.
[16] BURCHFIEL B C,BROWN E T,QIDONG D,et al.Crustal shortening on the margins of the Tien Shan,Xinjiang,China[J]. International Geology Review,1999,41(8):665-700.
[17] SCHARER K M,BURBANK D W,CHEN J,et al.Detachment folding in the southwestern Tian Shan-Tarim foreland,China:shortening estimates and rates[J]. Journal of Structural Geology,2004,26(11):2 119-2 137.
[18] GUO Zhaojie,ZHANG Zhicheng,WU Chaodong,et al.The Mesozoic and Cenozoic exhumation history of Tianshan and comparative studies to the Junggar and Altai mountains[J]. Acta Geologica Sinica,2006,80(1):1-15.
[19] MA Delong,PAN Jianguo,ZHANG Huquan,et al.The geometry and kinematic characteristics of T/P syn-tectonic unconformities at Xiaoquzi anticline and its geological significance to tectonic evolution at the south margin of Junggar basin[J]. Chinese Journal of Geology,2018,53(1):146-154.
[20] CHEN Tao,WEI Dongtao,YANG Haibo,et al.The tectonic characteristics on the foreland thrust belt and its influence on reservoiring of oil and natural gas in southern Junggar basin[J]. Natural Gas Geoscience,2006,17(5):711-718.
[21] ZHUO Qingong,ZHAO Mengjun,ZOU Kaizhen,et al.Petroleum distribution in foreland thrust belts and its exploration areas in midwest China[J]. Xinjiang Petroleum Geology,2018,39(2):125-133.