摘要
不整合及其性质和强度的确定对理解克拉玛依至百口泉地区构造变形历史和油气聚集规律具有重要意义。根据地震资料研究显示,该区二叠纪至中生代地层中存在多个不整合面,且多为构造运动的反映。其中对克-百地区构造形成具有重要影响的有四期,其一发生在中二叠统下乌尔禾组沉积后,主要表现为冲断掀斜运动,使其前的二叠纪沉积向南东方向掀斜抬升,遭受剥蚀;其二发生在三叠纪末期,对克百断裂上盘大侏罗沟断层至百口泉段的构造有重要影响;其三发生在中侏罗世末,该期构造运动在克百断裂带及其上盘表现最为清楚,以冲断为主,局部地区有褶皱现象;其四发生在早白垩世末期,表现为掀斜运动,褶皱和断裂作用相对较弱。克-百地区不同时期、不同构造部位变形的差异性与构造动力条件密切相关。
The recognition of unconformities and their properties and intensities is of significance for understanding the tectonic history and petroleum accumulation regularities in Ke-Bai area, northwestern margin of Junggar basin. Seismic data show that there are several unconformities, reflecting several times of tectonic, movements, of which, four times of tectonic movements played important roles in the formation of the structures in Ke-Bai area. The first occurred after sedimentation of the Middle Permian Lower Wuerher Formation, showing the lower and Middle Permian titling toward the southeast to be eroded; The second occurred at the end of the Triassic, affecting the area from the Dazhuluogou fault to Baikouquan in the hanging wall of Ke-bai fault; The third occurred at the end of Middle Jurassic, showing thrust faulting with gentle folding in the Ke-Bai fault and its hanging wall; The fourth occurred at the end of the Early Cretaceous, showing titling with weak faulting and folding. The differences in deformation of various periods and different areas in Ke-Bai area are closely related with the geodynamic conditions.
出处
《高校地质学报》
CAS
CSCD
北大核心
2008年第2期199-205,共7页
Geological Journal of China Universities
基金
中国石油天然气股份公司重点科技攻关项目“准噶尔盆地西北缘滚动精细勘探(2005-2009)”资助
