【作者】 郭亚；

【导师】 姜效典； 王金铎；

【作者基本信息】 中国海洋大学 ， 地质工程， 2009， 硕士

【摘要】 馆上段曲流河沉积的砂岩是良好的储层,困扰石油勘探开发的难点是砂岩空间分布不均匀。如何利用三维地震描述方法寻找储集体物性好的河床微相是提高勘探开发效益的重要手段。曲流河主要包括河床、堤岸、河漫和牛轭湖4个沉积微相,岩石组合为砂泥岩互层,具有“泥包砂”的特点。各沉积微相的地震反射特征为:河床强能量、负极性,堤岸中强能量、负极性和高频,河漫弱能量、极性不固定,牛轭湖最强能量、负极性。地震相宏观描述的水平切片(层拉平水平切片)、三维立体显示和分频扫描技术可快速地识别河床与河漫微相,确定沉积微相精细描述的目标区。地震属性优化组合分析方法可以有效地消除地震方法划分曲流河沉积微相的多解性。利用地震方法精细描述的曲流河沉积微相结果与测井资料吻合较好,说明先宏观、后精细的地震方法描述曲流河沉积微相是行之有效的。在对桩106井区砂体进行地震属性预测的基础上,进一步确定油气储层的空间展布及其储层参数,在井处建立地震属性与储层岩性、储层流体性质储层参数间的关系,进行储层横向预测,建立油藏模型。应用地震属性优化技术研究桩106井区沉积相,优选出对所求解问题最敏感(或最有效、最有代表性)的属性个数最少的地震属性或地震属性组合,运用降维映射、属性选择和聚类、交会分析等地震属性优化方法,优化出了预测储层的地震属性,同时结合实钻资料运用地质统计学进行定量分析,对优选出的地震属性进行了验证,可以有效地消除地震方法划分曲流河沉积微相的多解性。采用地质统计学原理,如果某种地震属性(如速度等)与含油气饱和度存在着某种统计关系,则可利用这种地震属性平面图转换成孔隙度平面图。采用由地震数据预测孔隙度类似的原理和方法,即借助地震属性(地震属性与储层物性直接相关),引入地震属性优化方法,可能会极大地提高用地震数据预测孔隙度的可靠性与精度。更多还原

【Abstract】 The sand sedimentated at the upper Guantao group is a better reservoir, but the difficulty for exploration and development is that the sand rock distributes heterogeneously in space. How to find the river bed with better physical property is an important way to improve the benefit of exploration and development. The meander river is including mainly of four sedimentary micro-facies: river bed, bank, overflow and ox-bow lake. The rock is interactive of sand and shale with the characters of shale included sand. The seismic reflection characters of sedimentary micro-facies are: stronger energy and negative polarity of river bed, stronger energy, negative polarity and high frequency of bank, poor energy and uncertain polarity of overflow, strongest energy and negative polarity of ox-bow lake. The river bed and overflow can be identified quickly with techniques of level slice (horizontal level slice), 3D visualization displaying and frequency division scanning; the target described by sedimentary micro-facies is also determined by it. The multiple solutions can be resolved effectively with the seismic attribute optimized and combination. The result gotten by seismic method description is consistent better with the logging data, which proves an effective way of description meander river.Through Seismic attribute optimized technique research Zhuang 106 area sedimentary facies, optimize seismic attributes or attribute combination for geological character sensitivity. The method is optimize seismic attributes for reservoir research by using depress dimension mapping, classes , variogram analysis. Furthermore, we analyse drilling to confirm these seismic attributes. The multiple solutions can be resolved effectively with the result. The seismic attribute can be convert to porosity if seismic attribute has relationship with porosity according to Geo-statistics principle. The result of porosity using seismic attribute converted can be get more precision.更多还原