The Characteristics of the Small Faults in Mesozoic Strata of ywb Area in the South of Ordos Basin and Its Significance for Oil and Gas Exploration
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摘要: 通过对近年采集的高品质"两宽一高"（宽频带、宽方位、高密度）三维地震资料精细处理解释发现鄂尔多斯盆地南部ywb地区中生界发育一系列小断层。在对断层构造及其演化特征研究基础上，系统分析了小断层体系特征、活动期次及其动力学成因机制。研究认为微小断层起到了沟通油源、控制油气运聚及富集的作用，与小断层伴生的裂缝能够改善致密储层的物性。研究结果对该区中生界油藏主控因素和成藏规律有了新认识，对该区油气勘探具有重要指导意义。
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关键词:
- 鄂尔多斯盆地南部 /
- “两宽一高”三维地震 /
- 小断层 /
- 油气成藏 /
- 勘探意义
Abstract: Through a fine interpretation of the high-quality 3D seismic data, i.e. broadband, wide-azimuth and high-density, acquisitioned in recent years, this paper finds that a series of small faults are developed in Mesozoic strata in the ywb area region of the southern Ordos Basin. Based on the research on the tectonic structure and evolution of the fault, this paper analyzes the system of the fault, its activity period and its dynamic mechanism. It is suggested that the small fault played an important role in connecting sources rocks with reservoir beds, controlling oil/gas migration and accumulation. The cracks associated with small fault can improve the physical properties of tight sandstone reservoir. The results of the study have a new view on the main controlling factors and the law of hydrocarbon accumulation, and also have an important guiding significance for oil/gas exploration in this area. -
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