Study on the Determination of the Chenbao Strike-Thrust Faultin Gaoyou Sag and Its Petroleum Significance
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摘要: 中国东部发育多个中新生代断陷盆地，长期处于构造伸展环境中，难以形成挤压构造样式。笔者根据高精度三维地震数据，在苏北盆地陈堡地区精细解析出一条走滑逆断层，结合生长指数法分析断层活动性，并明确其成因机制。研究表明，陈堡走滑逆断层走向近EW，倾向为S，倾角大于70°，呈高角度向南倾斜，错断了T23、T33和T04等主要反射层，表现为同沉积断层，其主要活动时期为阜宁组时期，阜三段时期活动性最强，该断层的形成与区域构造背景有关，属于走滑诱导和重力滑动共同成因。陈堡走滑逆断层对烃源岩形成、油气运移、圈闭发育都具有控制作用，认为陈9断块发育有利圈闭，勘探潜力大。Abstract: Many Meso-Cenozoic rift basins developed in eastern China, which is difficult to form the compressional structural style. This paper studies a strike-thrust fault in Chenbao oilfield of Subei Basin and analyzes its geometric characteristics and forming mechanism based on high quality 3-D seismic data. It is shown that the reflections of T23, T33, T04 were cutted by the strike-thrust fault, which strike to EW and incline to south with a high angle. The main activity periods of the strike-thrust fault were E1f era. The strike-thrust fault was formed by slide gravity and strike induction under its deep background. The source rocks, hydrocarbon migration and traps were strongly affected by the strike-thrust fault. The oil trap of Chen9 block has been evaluated as an important petroleum potential.
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Key words:
- strike-thrust fault /
- Chenbao oilfield /
- Gaoyou sag /
- Subei basin /
- favorable trap
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