鄂尔多斯地块西部构造研究中几个值得注意的问题

基于20世纪70—80年代对鄂尔多斯地块西部构造的研究,所得出的地块西部南北统一的东西挤压逆冲推覆构造模式,随着目前该区油气勘探实践发展及研究的逐渐深入,已经越来越难以解释地质实际问题。同时,地块西部统一的东西向运动及南北成带的构造模式值得认真推敲;该区不存在大规模的前陆盆地;关于横向构造带、南北分区以及南北运动模式等问题的相继提出,说明随着研究的不断深入,地块西部区域构造的复杂性和多样性值得重新审视。在分析总结该区构造特征及发育模式时需要不断地加强全面研究,并对原有的认识进行不断的补充、修订和完善。

Some important problems on the structural study of the western Ordos block

A uniform E-W compressional thrust nappe model was constructed for the north and south of the western Ordos block on the basis of a study of the structure of the western Ordos block conducted in the 1970s-1980s. However, this model has become more and more difficult to explain real geological problems as petroleum exploration and research in the area go on. In addition, the structural model of the uniform E-W-trending movement and N-S zoning in the western Ordos block is questioned, no large-scale foreland basin exists in the area and such problems as the transverse structural belt, N-S zoning and N-S-trending movement are presented-all these indicate that the complexity and diversity of the regional structures in the western Ordos block should be reconsidered. In analyzing and summarizing the structural characteristics and development model in the area, we should strengthen a comprehensive study and continuously supplement, revise and improve our original knowledge.