【摘要】 本文针对储层含气性检测,提出了利用中心频率估算地层吸收参数(地层Q值)的方法。该方法首先利用S变换对地震信号进行时频域转换,得到能量分布函数;然后基于该函数,计算中心频率及其与地层Q值之间的关系,获得地层等效Q值,进而得到单套地层Q值。模型正演表明,含气层中心频率变小,在地层Q值参数剖面上表现为强吸收异常,从而验证了应用中心频率法估算地层Q值检测气层的可行性。将该方法应用于东营凹陷永安地区实际资料中,估算的地层Q值比较真实地反映了地层吸收特征,提高了气层检测的精度。更多还原

【Abstract】 Aiming for gas-bearing formation identification,this paper presents a method for estimating stratigraphyic absorption parameter(Q value) by seismic signal central frequency.Firstly an energy distribution function can be obtained by a time-frequency transform on seismic signals with the S-transform.Then based on this function,the central frequency and the relation between the central frequency and the stratum Q value are calculated,and the equivalent strata Q value is obtained.And then the single formation Q value is work out.In the forward model,the central frequency of the gas-bearing formation becomes smaller than non-gas-bearing formations,and strong absorption are presented in the Q value profile.The phenomena make sure of the feasibility of the method in strata Q value estimation.The Q-value estimation by this method in Yong’an,Dongying Sag reveals the actuality of the absorption characteristics.更多还原