河流相砂泥岩薄互层基本地震属性特征研究

在砂泥岩薄互层储层预测研究中，常因地震资料的“假象”或“陷阱”造成解释或预测结果的错误。在分析和总结前人研究工作的基础上，基于单砂体楔形模型，运用褶积方法正演合成地震记录，并提取其振幅类和瞬时类共20种基本地震属性；讨论了不同属性提取时窗对这些地震属性的影响，遴选出8种受时窗影响小且具有代表性的地震属性。建立了两种典型砂泥岩薄互层地质模型，重点分析了遴选出的8种基本地震属性的变化特征，总结了它们随薄互层砂岩厚度、泥岩夹层厚度和砂泥岩累积厚度的变化规律，为砂泥岩薄互层地震解释和储层预测的地震属性优选提供了一定的理论依据。

The “pseudomorphs” or “traps” in seismic data often cause incorrect results in geological interpretation and reservoir prediction of sand-shale interbedded layers.By analyzing and summarizing the previous research achievements,a single sand body wedge model was constructed; then,synthetic seismogram was obtained by convolution forward modeling method and its basic seismic attributes were extracted.Moreover,the attributes were classified by their calculation theories and the effect of different extraction time-windows on seismic attributes analysis has been discussed.Eight representative attributes slightly impacted by the extraction time-windows were selected.Then,two typical sand-shale interbedded layers models were built,and analyzed the variation characteristics of the selected attributes.The variation rule of the selected attributes via the thickness of sand,shale and accumulated interbedded layers was summarized,and provide some theoretical basis for seismic attributes optimized in reservoir prediction of thin sand-shale interbedded layers.