柴达木盆地三湖气聚集区某区第四系浅层气层AVO特征研究

在分析测井资料的基础上深入研究了柴达木盆地三湖新凹陷第四系的物性参数 ,结合地质、地震等多信息资料 ,选择某区中型气田 ,从浅至深设计了 1 1个薄互层模型进行平面波波动方程正演模拟 ,计算固体多层介质的平面波合成记录。结合测井储层评价 ,对合成记录作了精细的解释 ,选取了主力气层组所在的模型 3作了详细的描述 ,给出了实际处理的 AVO分析CMP道集的实例。结果表明 AVO技术可以用于该区第四系浅层天然气的识别。

RESEARCH FOR THE AVO CHARACTER OF THE SEBEI QUATERNARY GAS RESERVOIR IN QAIDAM BASIN

The Sanhu new depression is a very important quaternary natural gas reservoir zone not only in China but also in the world. This paper studies its AVO character. Eleven models from the well logging data are designed. The synthetic seismogram resulted from elastic wave simulation are calculated for each model. This is called forward modeling. Then, the paper analyses the factors that can affect the interpretation result and precision of models. At last, the paper gives a field example of inversion result from field seismic data CMP gather near the model well. The conclusion is that AVO technique can be applied in this area to detect hydrocarbon directly.