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Static correction method for surface microseismic monitoring data

Jiang Yudong,Song Weiqi,Guo Xiaozhong,Liu Taiwei,Feng ChaoJiang Yudong,Sinopec Geophysical Research Institute,Nanjing 211103,China  
Surface microseismic monitoring lacks near-surface velocity data and first break picked in every trace caused by low S/N;therefore,we use perforating data,logging data and microseismic event monitoring data to study the static correction method for surface microseismic data.For the picking of discontinuous first arrival,we put forward to utilize guide trace method to pick up the first arrival at every trace of perforating event and the strong microseismic event around the perforating point.By using acoustic logging data,the initial velocity model of the formation below the datum is built to calculate the theoretical traveltime and initial statics.Aiming at the different influence of the velocity variation in shallow and deep layers,we design 2D velocity model for shallow layer and 1D velocity model for deep layers;then,in terms of the actual first arrival of perforating event,the initial velocity mdoel is corrected by inversion method,then the corrected velocity model is adopted to simulating the theoretical traveltime of perforating event and calculate the total statics.Finally,actual data processing result proves the effect of the method.
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