【摘要】 上第三系馆上段曲流河沉积的砂岩是良好的储层,但砂岩的空间分布一般不均匀。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种沉积微相,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:河床呈强能量、负极性;堤岸呈中强能量、负极性和高频;河漫呈弱能量、极性不固定;牛轭湖呈高强能量、负极性。通过水平切片(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。地震相精细描述的振幅、频率和波形参数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。更多还原

【Abstract】 Neogene upper Eg mender sedimentary sandstone is good reservoir,but the spatial distribution of sandstone is generally non-uniform.How to use 3-D seismic description to look for river bed microfacies that is good physical property of reservoir is important tool improving benefit of exploration and development.The mender mainly includes several sedimentary microfacies: river bed,bank,flood plain and ox-bow lake;the rock composition is interbedded sand and shale characterized by "sand coated by clay".The feature of seismic reflections for each sedimentary microfacies is strong energy and negative polarity for river bed;mid-strong energy,negative polarity and high frequency for bank;weak energy and non-fixed polarity for flood plain;and strong energy and negative polarity for ox-bow lake.The river bed and flood plain microfacies can be rapidly identified by level slice(horizontal level slice),3-D visualization show and frequency division scanning that also can determine the target zone where the fine description of sedimentary microfacies is needed.The parameter composition analysis of amplitude,frequency and waveform finely described by seismic facies can effectively eliminate the multi-solution resulted from the division of mender sedimentary microfacies by seismic method.The results of mender sedimentary microfacies finely described by seismic method is well consistent with logging data,which showed that using the seismic method of "the macro analysis being first and the fine analysis being second" to describe the mender sedimentary microfacies is feasibility.更多还原