利用储层的频谱吸收特性识别油气藏

Hydrocarbon recognition based on spectrum absorption characteristics of reservoir.

窗函数能量归一化的改进广义S变换能在保持时间分辨率不降低的前提下,提高频率域分辨率。本文基于改进广义S变换,通过黏弹性介质波动方程正演模拟,研究黏弹性介质储层的频谱吸收特性。地震波穿过含油气储层时,高频能量相对于低频能量衰减更强,其频谱特征为低频能量相对增加、高频能量相对衰减,因此储层的频谱吸收特性能很好地指示储层的油气富集程度。理论模型和实际井旁地震道的频谱分析结果验证了应用频谱吸收特性检测储层含油气性的有效性和可行性。

Improved generalized S transform of window function normalized energy improves the frequency resolution with time resolution not lowering at the same time.Through the forward modeling of visco-elastic wave equation,we discuss in this paper spectrum absorption characteristics of reservoir based on improved generalized S transform.When seismic waves pass through reservoir,high frequency energy attenuation is more severe than low frequency.So spectrum absorption characteristics show that low frequency energy is relatively augmented,and high frequency energy relatively diminished.The spectrum absorption characteristics can indicate the concentrated degree of petroleum in reservoir.The frequency spectrum analysis of model data and real seismic data near wells proves the effectiveness and feasibility of this method.