The tectonic uplift episodes and energy effects in the northeastern Ordos basin
The Ordos basin is rich in various energy and mineral resources.After the exploration and development of the Sulige and Yulin gas fields,the Shenfu deep coalbed gas field,China's first to exceed 100 billion cubic meters,has been discovered in the northeastern Ordos basin,presenting promising exploration prospects.However,intense late-stage uplift and erosion in the northeastern Ordos basin significantly affect the occurrence,distribution,and reservoir characteristics of hydrocarbon resources.Concurrently,the timing of its tectonic activity remains unresolved,hindering further energy resource exploration in the area.Detrital zircon and apatite fission-track analyses reveal that zircon ages(minimum 257±22 Ma)generally exceed stratigraphic ages,recording thermal events from source areas.This indicates that post-Triassic tectonic thermal events in the northeastern basin have been below the complete annealing temperature of zircon tracks.Fission-track age analysis suggests four major uplift episodes at 217～203 Ma,150～135 Ma,90～60 Ma,and 60～10 Ma.These episodes correlate with the formation period of tight sandstone gas in the Upper Paleozoic,the hydrocarbon charging period,the sandstone-type uranium mineralization period,and the two periods of hydrocarbon redistribution,respectively.This indicates a close relationship between the generation,migration,and accumulation of energy deposits and these tectonic thermal events.
万方数据
维普
