摘要
苏里格气田当含气饱和度小于70%时,泊松比变化不明显,用AVO方法进行含气性检测效果不甚理想。基于Fatti近似的弹性波阻抗方法,充分利用了叠前资料进行反演,包含了丰富的岩性及流体信息,但其小角度时的算法不稳定及建立在"湿"岩石背景假设条件下的反演精度不高的缺点也很明显。改进后的Fatti近似公式算法更加稳定且建立了基于真实岩石物理参数的变量关系,提高了反演精度。应用实例表明应用从弹性阻抗反演数据体中获得的λ-μ-ρ参数进行交会,对苏里格气田低含气饱和度的气层检测效果明显,很好地反映了储层信息。
In Sulige area,when gas saturation is lower than 70% , the change of Poisson＇s ratio is not obvious, and the application of AVO technique to detecting gas potential does not yield satisfactory result. The elastic impedance method based on Fatti approximation uses pre-stack data for inversion and includes abundant lithologic and fluid information. Nevertheless, its shortcomings in the aspects of the unstable solution in small angles and the low inversion precision built in wet rock background are also very obvious. The improved Fatti approximation formula is more stable, and its inversion precision built in the known regional rock property relationships between variables for the background case is raised. Practice demonstrates that the apphcation of the cross-plot of Lambda-Mu-Rho attributes extracted from the elastic impedance inversion volume is very effective in low gas saturation detection in Sulige area, as evidenced by the clear reflection of the reservoir information.
出处
《物探与化探》
CAS
CSCD
北大核心
2010年第2期237-241,共5页
Geophysical and Geochemical Exploration
关键词
Fatti近似
弹性阻抗反演
λ-μ-ρ交会
泊松比
Sulige gas-field
Fatti approximation
elastic impedance inversion
Lambda-Mu-Rho crossplot
Poisson＇s ratio
