基于三瞬属性的页岩气聚集区预测研究

Prediction Study of Shale Gas Accumulation Area Based on Three Instantaneous Attributes

在缺乏钻井资料的条件下,通过对地震属性中三瞬参数的理论分析,瞬时振幅、频率与页岩气聚集区有直接的关系,主要表现为地震波能量向低频方向移动;瞬时相位与反射强度无关,能够增强弱的相关同相轴的连续性。对某区二维叠偏地震数据提取三瞬属性,可确定页岩气地层顶底板地震层位,并推断出可能的页岩气聚集区。

Under the condition of lack of drilling data, based on the theoretical analysis of the three instantaneous attributes in seismic attributes, instantaneous amplitude,instantaneous frequency and shale gas accumulation area has a direct relationship, the main performance is that the seismic wave energy move to the low frequency direction; instantaneous phase has nothing to do with the intensity of reflection, it is able to enhance the continuity of weak correlation with the phase axis. Extracted three instantaneous attributes from partial and stack 2D seismic data in one district, determined the seismic horizon of the top and bottom of shale gas formation and inferred possible shale gas accumulation area.