渭河盆地结构及其油气成藏地质条件

渭河盆地是鄂尔多斯地块南缘的新生代断陷盆地。盆地前新生界基底结构与构造特征对于指导该区油气勘探与资源潜力评价工作至关重要。通过该区区域构造的分析，并综合利用野外地质、钻井资料、分析测试数据以及重力、航磁、地震等地球物理资料，对渭河盆地的基底组成和构造样式开展了研究，并进而对盆地的油气成藏条件进行了分析和探讨。研究结果表明，渭河盆地基底主要由4个不同物质分区组成；盆地下古生界的构造特征主要表现为被新生代正断层分割的强烈挤压褶皱变形，新生界则表现为受正断层控制的南断北超的半地堑式箕状断陷；渭河盆地前新生界基底和新生界盖层均具有较好的天然气成藏条件。 

Basin structure and hydrocarbon accumulation conditions of the Weihe Basin

The Weihe Basin, which is located in the southern margin of the Ordos massif, is a Cenozoic fault basin. Understanding the basement structure and tectonic characteristics of this basin are pivotal to guide hydrocarbon exploration and resource potential evaluation. In this paper, the basement and tectonic style of the Weihe Basin is studied using regional structural analysis, with comprehensively field geology, drilling, test and geophysical data such as gravity, aeromagnetic, seismic etc. In turn, the hydrocarbon accumulation conditions of this basin are also discussed. The research results show that the pre-Cenozoic basement of the Weihe Basin is mainly composed of four different physical partitions. The tectonic style of the Lower Paleozoic basement is mainly strong fold deformation, which is separated by Cenozoic normal faults. The Cenozoic tectonic style of this basin is a half graben, which is controlled by normal faults. Both the pre-Cenozoic and the Cenozoic of the Weihe Basin have good natural gas reservoir forming conditions.