Tracking Reflection Travel-time Based On Dynamic Time Warping

In seismic data processing and interpretation,reflection travel-time plays an important role.The reflection travel-time information is the core content of seismic tomography,which lays a good foundation for the following work of seismic data processing and interpretation.At present,there are many methods for tracking reflection travel-time,such as energy ratio method,cross-correlation method,artificial neural network method,edge detection method etc.However,the current technology of tracking reflection travel-time mainly has problems such as low noise immunity and low efficiency.Therefore,this paper studies tracking reflection travel-time based on dynamic time warping.The main research contents and achievements are as follows:Firstly,the author makes comparative researches on the different orders dynamic time warping.The preprocessing works such as filter,interpolation and normalization improve the signal-to-noise ratio of data,improve the accuracy of travel-time and make amplitude balance provide better data information for the following tracking travel-time.The author conducts comparative analysis on dynamic time warping in different orders,and through four numerical model experiments for comparison and verification,and concludes that the second order dynamic time warping(2-DTW)has advantages of stability and efficiency on tracking travel-time.Afterwards,the constraint effect of adjustment window on dynamic time warping is studied to achieve the purpose of improving the efficiency of the algorithm.In order to improve the efficiency of an algorithm,the most direct method is reducing the time complexity of the algorithm.For dynamic time warping,the simplest and the most effective way to reduce time complexity is adding adjustment window to constrain it.Based on seismic records,the Sakoe-Chiba Band is more suitable.In this paper,the high efficiency of the Sakoe-Chiba Band in the program is verified through different seismic data.In this paper,the high efficiency of the Sakoe-Chiba Band in the program is verified through different seismic data.Finally,dynamic time warping is compared with other methods.There are many methods to extract reflection travel-time.In this paper,the author introduces the other two methods in detail.The criterion of maximum amplitude method is too simple,and its result of tracking travel-time is easily affected by noise.Cross-correlation method has some difficulties in the selection of reference trace,which is not convenient for extracting travel-time accurately.Dynamic time warping solves the above problems at the same time,and extracts the accurate travel-time information from actual seismic data.