基于频变衰减弹性阻抗的纵、横波品质因子反演方法  

Inversion method of quality factor of P-wave and S-wave based on frequency-dependent attenuation elastic impedance

作　　者：谭明 龚伟[1] 廖茂辉 李弘艳[1] 孙萌萌 杜天玮 王群武 张向阳 TAN Ming;GONG Wei;LIAO Maohui;LI Hongyan;SUN Mengmeng;DU Tianwei;WANG Qunwu;ZHANG Xiangyang(Northwest Oilfield Company,SINOPEC,Urumqi 830011,China;Kunlun Digital Technology Co.,Ltd.,Beijing 100007,China;Beijing Precise Energy Technology Co.,Ltd.,Beijing 100085,China)

机构地区：[1]中国石化西北油田分公司,新疆乌鲁木齐830011 [2]昆仑数智科技有限责任公司,北京100007 [3]北京普瑞斯安能源科技有限公司,北京100085

出　　处：《断块油气田》2024年第3期494-502,共9页Fault-Block Oil & Gas Field

基　　金：省部级横向科研项目“顺北82井区侵入岩发育区断控储集体描述评价研究”(34400008-21-ZC0613-0055)。

摘　　要：地层品质因子在页岩气储层、致密气和水合物等勘探领域具有较大的应用潜力。文中,首先,基于近似常数地层品质因子模型和弱黏弹性近似假设推导了黏弹性介质PP波弹性阻抗方程,有效反映了地层纵、横波速度、密度、纵波品质因子和横波品质因子的频变特征;其次,使用回溯快速迭代软阈值算法,实现了衰减弹性阻抗反演,为进一步提高多参数反演的稳定性,提出了基于对数域不同频率衰减弹性阻抗差异的纵、横波品质因子直接提取方法;最后,使用Marmousi2模型合成含噪声数据验证了反演方法的适用性和稳定性,并将该方法应用到实际工区。结果与已钻井解释结果一致,说明该方法在油气分布预测应用中具有一定的效果和潜力。The formation quality factor Q has great potential in the exploration of shale gas reservoirs,tight gas and hydrates.Firstly,based on the approximate constant Q model and the weak viscoelastic approximation assumption,the PP wave elastic impedance equation of viscoelastic medium is derived,which effectively reflects the frequency variation characteristics of the P-wave and S-wave velocity and density,and P-wave and S-wave quality factor of the formation.Secondly,the backtracking fast iterative soft threshold algorithm is used to realize the attenuation elastic impedance inversion.In order to further improve the stability of multi-parameter inversion,a direct extraction method of P-wave and S-wave quality factors based on the differences of attenuation elastic impedance at different frequencies in the logarithmic domain is proposed.Finally,the noisy synthetic data of Marmousi2 model was used to verify the applicability and stability of the inversion method,and the method was applied to the actual working area.The results are consistent with the drilling interpretation results,indicating that the method has certain effectiveness and potential in the application of oil and gas distribution prediction.

关 键 词：黏弹介质 衰减弹性阻抗 地震反演 油气检测 

分 类 号：TE132.14[石油与天然气工程—油气勘探]