Automatic estimation of traveltime parameters in VTI mediausing similarity-weighted clustering

Compared with hyperbolic velocity estimation methods,nonhyperbolic methods(such as shifted hyperbola)are better choices for large offsets or vertical transverse isotropy(VTI)media.Since local seismic event slope contains subsurface information,they can be used to estimate zero-offset two-way traveltime and normal moveout velocity.The traditional velocity estimation methods require a great deal of manual work and are also prone to human error.In order to estimate the traveltime parameters for VTI media automatically,in this paper,we propose to use predictive painting and similarity-weighted clustering to obtain traveltime parameters.The predictive painting is used to estimate zero-offset two-way traveltime,and the shifted-hyperbola traveltime equation is used to obtain velocity and anisotropy attributes.We first map local slopes to zero-offset two-way traveltime and moveout-parameters domain and then use similarity-weightedk-means clustering to find the maximum likelihood anisotropy parameters of the main subsurface structures.In order to demonstrate that,we apply the similarity-weighted clustering method to synthetic and field data examples and the results are of higher accuracy when compared to the ones obtained using multiparameter semblance-based method.From estimation error section,it can be seen that the estimation error of multiparameter semblance-based method is about 3-5 times that of the proposed method.

A generalized two-mode entangled state： Its generation,properties, and applications

用在操作员的一个订的产品以内的集成的技术，我们构造一个概括二模式的纠缠的状态，它能被不均匀的横梁 splitter (BS ) 产生。这个状态的一些重要性质例如 orthogonality 和 Schmidt 分解，被在并列表示导出 BS 操作员的表示也讨论。作为它的应用程序，说结合，获得操作符身份，产生新压榨的操作符(挤压的状态) 也被介绍。量远距传物的忠实能被使用纠缠了资源的不均匀的新挤压的状态在某些盒子下面提高，这被显示出。