论文部分内容阅读
针对频谱比值法在高低频端频谱能量较低处频谱比值点扰动大、抗噪能力差的特点,本文提出了频谱匹配Q值计算方法,将Q值的计算过程从频谱对数域转换到频谱域,利用频谱的匹配程度作为优化目标函数,减小了计算误差,提高了算法的抗噪能力.进一步应用上述方法计算出准确的检波器级间地层吸收衰减系数,并利用推导出的级间吸收衰减系数(检波器间吸收衰减系数)与层吸收衰减系数(相邻检波器间吸收衰减系数)的关系式建立超定方程组,通过优化迭代方法计算出准确合理的地层层Q值.利用该方法对胜利油田垦71工区J41井零偏VSP资料进行处理,提取的Q值与地层含油气性对应关系良好.
Aiming at the large perturbation of spectral ratio points and poor anti-noise ability of spectral ratio method at low and high frequency spectral energy, this paper proposes a spectral matching Q value calculation method, which converts the calculation process of Q value from spectral logarithm to spectrum Domain, using the matching degree of the spectrum as the optimization objective function, the calculation error is reduced and the anti-noise ability of the algorithm is improved. The above-mentioned method is further used to calculate the formation absorption attenuation coefficient between the detector stages, The equations of overdetermined equations are established by the relationship between absorption attenuation coefficient (absorption attenuation coefficient between detectors) and layer absorption attenuation coefficient (absorption attenuation coefficient between adjacent detectors), and an accurate and reasonable formation formation Q value is calculated through an optimized iterative method. The method deals with the VSP data of J41 well in Ken 71 work area of Shengli Oilfield. The extracted Q values are well correlated with the hydrocarbon-bearing properties of the strata.