摘要:鄂尔多斯盆地西缘北区横山堡地区是重要的油气接替区域。本文利用构造解析、地震勘探等技术方法，对研究区构造特征与油气勘探目标进行了研究。结果表明，晚侏罗纪末期，研究区为银川复背斜东翼，喜山期构造调整后转为前缘反冲带，由一系列西冲东倾逆冲断层与断背斜组成；该区可分为西部逆冲断褶带、中部逆冲断阶带和东部过渡构造带3个构造单元。断层可分为4级；以燕山期近南北—北北东向逆断层为主，其次为喜山期近东西向走滑断层，并错断了燕山期逆断层。构造样式为一系列东倾单向叠瓦状冲断组合，由近南北向逆断层及加持于其中的断块组成，断块往往为一些小型断背斜，其轴迹走向以近南北—北北东向为主。地质结构为深层滑脱型单向东倾冲断构造。根据上述研究，在沙亥庙断裂上盘断背斜构造高部位优选出一个钻探目标。
关键词: 鄂尔多斯盆地西缘/
横山堡地区/
构造特征/
油气勘探目标
Abstract:Hengshanbu area is an important oil and gas succession field in the north of the western margin of Ordos Basin. In this paper, the structural characteristics and oil and gas exploration targets are studied by means of structural analysis and seismic exploration. The results show that the study area at the end of the Late Jurassic period occurred the eastern wing of the Yinchuan anticlinorium, which was transformed into the front edge recoiling zone after structural adjustment in the Himalayan stage, and is composed of a series of west-thrust east-dip thrust faults and faulted anticline, and can be divided into three tectonic units:the western thrust fold zone, the central thrust fault terrace belt and the eastern transitional tectonic belt. These faults can be divided into four grades, mainly the near NS-NNE thrust faults in Yanshanian dislocated by the near EW strike-slip fault in Himalayan stage. The structural style is a series of east-dipping unidirectional imbricate thrust combinations, which are composed of near NS thrust faults and fault blocks sandwiched in them. The fault blocks are usually some small faulted anticlines, whose axial trace is mainly in the near NS-NNE direction. The basic geological structure is a deep decollement east-dipping unidirectional thrust tectonics. According to the above researches, an optimal target is selected in structural high part of the hanging wall faulted anticline of Shahaimiao fault.
Key words:The west margin of Ordos Basin/
Hengshanbu area/
Tentonic characteristics/
Oil and gas exploration target
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