摘要
由于黄土塬二维地震静校正问题造成假构造现象,长期以来认为鄂尔多斯盆地中生界不发育断层。利用二维地震剖面层拉平和横向压缩技术,发现多个断距小且大多近于直立的断裂,经过断层组合,确认北东向断层的存在,并认为发育北东向断裂带。该北东向断层可能是基底断裂在燕山期右旋扭动应力场作用下重新活动并在中生界产生的撕裂断层,很可能在全盆地中都有发育。通过断层展布与油藏分布的叠合对比,显示出中生界油藏分布与断层位置有关,该断层可能是油气成藏的重要运移通道。进一步推论认为,中生界高陡断裂带的分布对中生界油气藏形成和分布起着重要的控制作用。
Because of the fake tectonic phenomenon caused by static correction of 2D seismic in loess tableland, it is believed that there is no fault in Mesozoic of Ordos Basin for a long time. Based on the layer leveled and lateral compression in 2D seismic profile, multiple faults with small slip were discovered, and most of them were nearly vertical~ NE-trending fault existed, and the fault zone developed after the combination of faults. The NE-trending faults might be Mesozoic tear faults which formed when basement faults reacted under the condition of right lateral wrench movement in Yanshanian, and they might develop in all-basin scale. By the superimposed contrast of the distributions of fault and reservoir, the relationship between the distribution of reservoir and the position of fault was significant, and the fault might be important migration pathway for hydrocarbon accumulation. Further deduction believed that the distribution of high plugging fault zone played an important controlling role on the development and distribution of reservoir in Mesozoic. The discovery of faults had vital significance on the prediction of basin Cenozoic tectonic evolution and reservoir distribution.
出处
《地球科学与环境学报》
CAS
2013年第2期56-66,共11页
Journal of Earth Sciences and Environment
基金
国家重大科技专项项目(2011ZX05001-001-04)
关键词
断层
基底断裂
燕山运动
运移通道
油气分布
中生界
鄂尔多斯盆地
fault
basement fault
Yanshan movement
migration pathway
reservoir distribution
Mesozoic
Ordos Basin
