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横波速度测井曲线是进行岩石物理分析、AVO正演、AVO属性分析以及叠前反演等工作必不可少的基础资料,但横波测试设备与常规测井测试仪器不同,造成额外费用,往往很多井没有横波资料;同时还存在实测横波速度异常,不能满足实际工作需要.针对这些问题,本文利用经验公式法、XuWhite法及多元线性拟合法在YB地区进行横波预测,对比了不同方法的预测精度,讨论了横波预测方法的主要影响因素.对于Xu-White法来讲,孔隙形状是影响预测结果的重要因素;对于多元线性拟合法来讲,拟合曲线及其数目的选择对预测结果影响较大.使用三种预测方法进行预测的结果表明Xu-White法及多元线性拟合法效果较好,相对误差均小于5%;其中多元线性拟合法预测结果与实测横波资料误差最小,仅为4.46%.通过对比使用实测横波与使用多元线性拟合法预测的横波进行叠前反演的结果发现两者差别不大,并且原本无横波资料的井使用预测横波速度参与反演对反演结果起到改善作用,证明横波预测技术具有较高的推广应用价值.
S-wave velocity logs are essential for rock physics analysis, AVO forward, AVO attribute analysis, and prestack inversion. However, the shear wave testing equipment is different from the conventional logging testing equipment, resulting in additional costs, often We also do not have shear-wave data, and there are also abnormal S-wave velocity anomalies, which can not meet the needs of practical work.According to these problems, we use empirical formula method, XuWhite method and multivariate linear fitting method to predict S-wave in YB area, , Discussed the main influencing factors of the transverse wave prediction method.For the Xu-White method, the pore shape is an important factor affecting the prediction results; for multivariate linear fitting method, the fitting curve and the number of its choice of the prediction results The results of the prediction using the three prediction methods show that the Xu-White method and the multivariate linear fitting method are both effective and the relative errors are both less than 5%. The error of the multivariate linear fitting method and the measured transverse wave data is the smallest, only 4.46% By comparing the results of the prestack inversion using the observed shear waves with the predicted shear waves using multivariate linear fit They were not very different, and had no wave data using predictive of well-wave velocity inversion of the inversion results participation play a role in improving prove shear wave prediction techniques have a high application value.