Tectonic analysis of the eastern boundary of Ordos Basin: a case study of northern region of Shilou area
SHI Jing1, HE Dengfa1, BAO Hongping2, WEI Liubin2
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083, China; 2 Exploration and Development Research Institute of Changqing Oil Field Branch, PetroChina, Xi'an 710018, China
Abstract The boundary belt of the eastern margin of Ordos Basin is believed to be composed of the Jinxi flexural fold belt and Lishi fault,but this boundary is a residual boundary and not the original sedimentary boundary. Taking the northern region of Shillou as an example,a regional geological profile was constructed at the basin-mountain scale in the eastern part of the Ordos Basin. The 2D-Move software was used for inversion and forward simulation of tectonic evolution,and quantitative analysis of structural deformation was conducted. Based on theseresults,the eastern boundary of the Ordos Basin was redefined. (1)In the late Caledonian period,the northern part of the Shiliouarea was affected by deep basement fault activity,and salt detachment folds were formed in the Ordovician gypsum salt rock layers,followed by the deposition of the Carboniferous,Permian,Triassic,Jurassic and Cretaceous systems. During the Yanshanian,the strata were subjected to E-W compressive stress,causing the overall strata to tilt. In the Cenozoic Lvliang uplift,they accelerated and underwent differential weathering and erosion,forming the present tectonic pattern. (2)The present length of the regional geological profile is 263.76 km,with an altitude of up to 2000 m. The shortening of strata from the late Caledonian to the Cretaceous sedimentary period is 3.14 km,with a shortening rate of 1.18%. The elevation of the formation uplift is 3.82 km. (3)Based on the characteristics of stratigraphy,structure,and evolution,the eastern boundary of the Ordos Basin during the Yanshan Movement is redefined,and it is believed that the eastern boundary should extend easternward to the east side of Lvliang Uplift. This paper can provide a reference and new ideas for studying the eastern margin of the Ordos Basin,structural deformation,and coalbed methane exploration and development in the western Shanxi flexural fold belt.
Fund:Project of Tackling the Science and Technological Key Problems in PetroChina Changqing Oil and Gas Field Company (No. ZDZX021-01) and the United Foundation Project of the National Natural Science Foundation of China for Company Innovation and Development (No. U19B6003)
Corresponding Authors:
HE Dengfa,born in 1967,graduated from Northwest University in 1989 and obtained his Ph.D. degree from Research Institude of Exploration and Development in 1995,and is currently a professor at China University of Geoscience(Beijing). Now he is engaged in basin structures and tectonics,and integrated studies on petroleum geology. E-mail: hedengfa282@263.net.
About author: SHI Jing,born in 1999,is a master is degree candidate with the major of mineral prospecting and exploration at the China University of Geosciences(Beijing). E-mail: shijing202212@163.com.
Cite this article:
SHI Jing,HE Dengfa,BAO Hongping et al. Tectonic analysis of the eastern boundary of Ordos Basin: a case study of northern region of Shilou area[J]. JOPC, 2024, 26(1): 150-164.
SHI Jing,HE Dengfa,BAO Hongping et al. Tectonic analysis of the eastern boundary of Ordos Basin: a case study of northern region of Shilou area[J]. JOPC, 2024, 26(1): 150-164.
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