用模拟退火方法计算偶极横波时差

直接使用横波测井已经成为油气勘探开发中重要的手段。针对高频散的挠曲波 ,将基于模拟退火的优化方法引入阵列偶极子测井资料处理中 ,以得到横波时差。该方法与常规的速度求取方法不同 ,它不仅采用接收器阵列组合 ,而且采用单个源接收器在不同深度的组合。此方法也提供了一种在整个井段定量地得到相对置信度的方法。应用此方法处理了辽河油田 5 70 0横波测井数据 ,并与横波慢度的常规估计方法进行了对比 ,结果表明 ,此方法比常规的相关分析等方法更可靠

COMPUTATION OF DIPOLE SHEAR WAVE TRAVEL TIME USING SIMULATED ANNEALING METHOD

With the development of modern well\|logging techniques, direct shear wave logging has become an increasingly important tool in exploration and production geophysics. Shear wave logging tools use dipole radiation in the borehole to generate flexural waves in formation. The flexural wave is highly dispersive.In soft sediments, the high attenuation is associated with the shear wave. These factors make it difficult to determine the slowness of shear wave correctly. In this paper the simulated annealing method is introduced to determine the shear wave travel time. This method is more consistent than conventional picks based on slowness\|travel time coherence, especially in situations where the signal\|to\|noise ratio is low or the wavelet is emergent. This method also provides a means for quantifying the relative confidence in each pick ver the entire depth of the well. The method has been applied to the data recorded by the 5700 logging system in Liaohe Oil Company and compared favorably with more conventional estimates of shear wave slowness. It was shown to be robust even in areas of weak arrivals.