有限元分析法在红车断裂带构造应力场中的应用

摘要

We apply finite element method to the digital simulation of Triassic-Tertiary tectonic stress field in Hongche fault belt, Northwest of Junggar Basin.lt is indicate that all of the Triassic- Neogene is under the condition of tension.By exploration,we find that the exploration well usually have oil and gas in the stong tensile stress zones where are oil and gas accumulation areas and reservoirs.The strong tensile stress areas of Triassic-Cretaceous in Hongche fault belt is mainly distributed in the northwest edge of Junggar Basin where is located in the tectonic uplifts which develop multi-dimensional and complex fault systems,fonn a large number of local structural traps, devolop a lot of tension and tension-shear fractures,they are ideal tectonic stress field for oil and gas accumulation;The strong tensile stress areas of Neogene is mainly distributed in the southern part of Junggar Basin where can devolop tension and tension -shear fractures and form local structural traps which have the tectonic stress field condition of the formation of hydrocarbon reservoirs.%运用有限元分析法对准噶尔盆地西北缘红车断裂带三叠—新近系现今构造应力场进行数字模拟,结果显示,三叠—新近系整体处于张性环境勘探证实,在强张应力分布区探井多见油气,是油气储集和聚集区.红车断裂带三叠—白垩系强张应力区主要分布在西北部边缘,该区域处于构造隆起部位,发育复杂断层体系,形成大量局部构造圈闭,且有大量张性和张扭性裂缝发育,是储集油气有利构造应力场区新近系强张应力区主要分布在南部,可形成局部构造圈闭,发育张性和张扭性裂缝,具备形成油气藏构造应力场条件.