摘要
储层的衰减特性通常用品质因子Q来表征,Q值的准确提取对储层,特别是非常规气藏含气性的预测有重要意义。为此,引入Capon2D Q值估计新方法,对其求解过程进行了加权改进,并通过统计实验分别从准确性、稳定性角度对该方法的估计效果进行讨论。模型试算结果表明,与传统的谱比法相比,改进方法体现出对高频噪声不敏感,并且具有压制子波干涉的能力,从三维地震叠后资料中也可获得相对稳定和准确的Q值估计结果。将改进方法应用于四川盆地页岩储层沿层Q值估计,获得了稳定的估计结果,且表明低Q值区域与储层裂缝发育带具有良好一致性,因此可作为页岩储层含气性的标识。
The attenuation is an important indicator of reservoir lithology.It is usually measured by quality factor Q.The Qvalue extraction is of great significance for gas-bearing reservoir prediction.In this paper,we propose a new Q value estimation with introduced Capon2 D,which means an improvement with a weighting.The accuracy and stability of the proposed method are tested by statistical experiments.Based on model experiments,the proposed method has better robustness to high-frequency noise,and stronger ability to suppress the wavelet interference than conventional spectral ratio methods.For real data tests,a relatively stable and accurate Q value estimation is obtained from3 D seismic poststack data.Finally,the proposed method is applied to the reservoir Qvalue estimation in the shale exploration in Sichuan Basin.The estimated high-Q zone matches very well with the reservoir fracture-zone,which proves that this estimation may be used as an indicator for gas bearing in shale reservoirs.
作者
郭锐
林鹤
王前
张介辉
王高成
蒋立伟
GUO Rui;LIN He;WANG Qian;ZHANG Jiehui;WANG Gaocheng;JIANG Li-wei(New Resources Geophysical Exploration Division,BGP Inc.,CNPC,Zhuozhou,Hebei 072750,China;Zhejiang Oilfield Company,PetroChina,Hangzhou,Zhejiang 310000,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2018年第A02期182-188,14,共8页
Oil Geophysical Prospecting
基金
国家科技重大专项"油藏及非常规气藏地球物理配套技术"(2017ZX05018-004)资助
关键词
Q值估计
高频噪声
子波干涉
页岩含气性
Q value estimation
high-frequency noise
wavelet interference
shale gas bearing
