【摘要】 鄂尔多斯盆地西北部下古生界属祁连海域沉积区,从区域地质上推断存在台地边缘相,早期的钻探证实克里摩里组的碳酸盐岩储层可能存在礁滩相沉积,但目前对于该区礁滩相的地震特征、分布规模缺乏足够的认识。根据已知井礁滩相的地震特征和外探区的勘探经验,总结出了该区礁滩相的地震特征主要为较强振幅的丘形反射,应用地震相分析、地震属性分析、地震反演等多种技术预测了该区礁滩相的平面分布。在此基础上提供的风险探井——棋探1井,在克里摩里组钻遇礁滩相的生物碎屑灰岩、藻黏结灰岩和亮晶砂屑灰岩,并见含气显示。更多还原

【Abstract】 The Lower Paleozoic in northwestern Ordos Basin belongs to Qilian marine sedimentary province, in which Carbonate platform margin is inferred to be present from regional geology. Previous drilling confirms that there may be reef-bank facies in carbonate reservoir in Kelimoli Formation. However, the seismic attributes and distribution scale of the reef-bank facies in this area are not fully recognized. Based on known seismic attributes of reef-bank facies and experience of external exploration area, it is summarize that the seismic attribute of reef-bank facies is mainly hummocky reflection with relative strong attributes. Several technologies such as seismic facies analysis, seismic attribute analysis and seismic inversion are applied to predict the distribution of reef-bank facies in the study area. The actual data shows that in Qitan 1 well there are bioclastic limestone, algal limestone and sandy sparite limestone in Kelimoli Formation, and there are indications of gas-bearing property.更多还原