VTI介质三维VSP多波联合叠前AVA岩性参数反演方法及应用

发布时间：2018-04-03 21:16

本文选题：D　切入点：C　出处：《成都理工大学学报(自然科学版)》2017年05期

【摘要】：三维三分量(3D3C)VSP属于地下地震勘探方法,三维三分量VSP地震资料含有深度和丰富的地层岩性信息,有地面地震不可比拟的优势。为了发挥和应用三维三分量VSP资料的优势,提高油气勘探的成功率,需要反演出准确的岩性及弹性参数,用于精确预测储层、识别流体性质。以各向异性介质(VTI)弹性波传播理论为基础,研究多波精确振幅特征方程(AVA),并在此基础上建立了三维各向异性介质VSP多波联合叠前AVA反演岩性参数理论和方法。该方法利用对3D3CVSP资料处理的NMO道集,直接反演地层纵波速度、横波速度、密度及2个各向异性系数,在此基础上可进一步计算得到地层的弹性参数,这些参数对岩性及流体识别有重要作用。这套纵横波联合叠前反演方法适应直井及斜井3D3C VSP资料,并经实际斜井3D3CVSP资料处理,得到了与实际储层吻合的反演结果,证明了该方法的正确性和有效性。
[Abstract]:Three-dimensional three-component VSP seismic data contain depth and abundant stratigraphic lithologic information, which has incomparable advantages over ground earthquakes.In order to give full play to the advantages of three-dimensional three-component VSP data and improve the success rate of oil and gas exploration, accurate lithologic and elastic parameters are needed to accurately predict reservoir and identify fluid properties.Based on the theory of elastic wave propagation in anisotropic media, the accurate characteristic equation of multiwave amplitude is studied and the theory and method for inversion of lithologic parameters by VSP combined with prestack AVA in three dimensional anisotropic media are established.In this method, the velocity of P-wave, S-wave velocity, density and two anisotropic coefficients can be directly retrieved by using the NMO gathers processed by 3D3CVSP data. On this basis, the elastic parameters of the formation can be further calculated.These parameters play an important role in lithology and fluid identification.This set of P / S wave combined prestack inversion method is suitable for 3D3C VSP data of vertical well and inclined well, and the inversion results are consistent with the actual reservoir by processing 3D3CVSP data of actual inclined well, which proves that the method is correct and effective.
【作者单位】：油气藏地质及开发工程国家重点实验室(成都理工大学);
【基金】：国家科技重大专项(2008ZX05024-001)
【分类号】：P631.4

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