摘要
地层分布、重力、磁力、地震、CEMP多种资料综合分析认为,鄂尔多斯盆地西缘冲断构造带由六盘山弧形冲断体系和桌子山-贺兰山冲断体系组成,它们是互为独立的冲断推覆构造;明确指出,六盘山弧形冲断体系为祁连地体拼贴到华北陆缘地体(鄂尔多斯地块西部)之上的冲断推覆构造,具有独特的双层地体叠置结构。主张将华北地台的西界移至中卫-海原-宝鸡一线,并推断六盘山盆地深部发育华北地台的基底和古生界的盖层。这为在鄂尔多斯盆地以外地区勘探和鄂尔多斯盆地类似的古生界天然气赋存层系提供了线索,具有重要的理论和现实意义。
Liupanshan arc thrust system in Ordos basin is located at the joint between Qinqi geosynclinal system and North China platform, featuring special tectonic location and complex geology. The comprehensive analyses from strata distribution, gravity, geomagnetism, seismic and CEMP data show that the thrust structural belt in western margin of Ordos basin is composed of Liupanshan arc thrust system and Zhuozishan-Helanshan thrust system, whicb are two independent nappe tectonic systems. Liupanshan arc thrust system is a nappe formed by Qilian terrain splicing to North China epicontinental terrain located in western Ordos block, with distinct dual-terrain superposed textures. It is suggested that west boundary of North China platform should be changed toward Zhongwei-Haiyuan- Baoji direction, and assumed that in deep Liupanshan basin may develop the basement of North China and the cap rocks of Paleozoic, which supports ideas for petroleum exploration beyond Ordos basin and finding out other natural gas-enriched strata of Paleozoic similar to Ordos basin.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2006年第5期542-544,共3页
Xinjiang Petroleum Geology
