【摘要】 为研究准噶尔盆地的基底和地壳结构,在盆地内完成了4条地震转换波测深剖面,总长为1600km.结果表明,准噶尔盆地地壳具有陆壳性质,基底为双层结构,上层为海西运动期褶皱基底,下层为前寒武系结晶基底,褶皱基底厚度不超过10km,在三个泉凸起以北厚度较大,为3～10km,在此凸起以南,厚度只有0～4km.结晶基底顶面的埋深为5～16km.地壳厚度为44～52km,平均为47～48km.盆地内存在一系列基底断裂和深部超壳断裂,它们对盆地内油气分布有重要控制作用。更多还原

【Abstract】 To study the deep structures of basement and crust in Junggar basin, 4 seismic profiles from deep-sounding by converted waves of earthquakes have been done with total length of 1 600 km. The results of investigation show that the crust in Junggar basin features continental character, and the basement of the basin is characterized by two-layer structure, the upper layer is Hercynian folded basement, and the lower is Pre-Cambrian crystalline basement. The total thickness of Hercynian forded basement is less than 10 km, to the north of Sangequan swell its thickness is about 3～10 km, to the south of it its thickness is only about 0～4 km. The depth of the top of PreCambrian crystalline basement is about 5～16 km. The total thickness of the crust in the basin changes in range of 44～52 km, averages 47～48 km. A series of deep fractures have been detected in the basement and the crust in the basin, which are significant in the control of the distribution of oil and gas resources.更多还原