摘要
长期以来,研究储层的吸收性能一般采用傅氏变换方法,将信号分解为简谐波,且以线性方式求取目的层段相对平均吸收率,该方法制约了储层预测精度并影响到方法的推广应用。本文采用PRONY滤波方法,以阻尼滤波分解信号、做非线性滤波,直接求取目的层段的吸收系数。此方法对单波有很好的分解能力,能提供振幅谱、能量曲线及PRONY滤波剖面等三类显示,并具有较强的质控手段。在长庆气田子洲—佳县地区,用此方法做上古生界储层预测,取得了较好的效果,且对吸收系数与产气量之间关系有如下认识若产气量高,则剖面上大量缺失高频成分,能量低,吸收带清晰,为弱—空白反射;凡产气量低,则剖面上少量缺失高频成分,能量高,吸收带不清楚,为中强反射。
There has been long period of time that studying the absorptivity of reservoir was generally to uses Fourier transform that decomposes the signal into harmonic wave and computes the relative average absorptivity of targets by linear form,which constrained the predicting accuracy of reservoir and popularization of the method.The paper used PRONY filtering method that decomposes the signal by damping filtering,implements non linear filtering and directly computes the absorbing coefficient.The method has good decomposing ability for a single wave,can provide three kinds of shows such as amplitude spectrum,energy curves and PRONY filtered sections,having a strong QC tools.In Zizhou Jiaxiang area of Changqing gas field,using the method to predict the Upper Paleozoic reservoirs made good results,the knowledge of relation between absorbing coefficient and gas production is as follows:if it's high gas producing rate,more high frequency components are absent on section that characterized by weaker energy,evident absorbing zone and being weaker and blind reflection;on the contrary,if it's lower gas producing rate,less high frequency components are absent on the section that characterized by stronger energy,fuzzy absorbing zone and being middle strong reflection.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2004年第4期409-414,共6页
Oil Geophysical Prospecting
