Xin Ke-feng, Wang Hua-zhong, Ma Zai-tian, Zheng Wei
Geophysical Computer Center, Institute of Exploration and Development of Changqing Oilfield Sub-Division of CNPC, Xinglongyuan Sub-District. Weiyang District, Xi'an City, Shanxi Province. 710021, China
Abstract：Based on double focusing imaging theory, the paper presented the method of interactive velocity analysis on common focus gathers (CFP),which is used to build up preliminary imaging velocity model and finish the transform from time horizons to depth layers and from velocity field in time domain to that in depth domain. The method follows the principle of travel time being equal to determine the velocity of horizons and takes optimized imaging quality as judge standard of velocity correctness. The key ring transformed from theory to practice for the method of interactive velocity analysis on CFP gathers is computation of CFP response curves and time-shifted curves according to the results of time interpretation,which is also the new contribution of the paper in theory and practice. The method is characteristics of flexible implementation, stable procedure and accurate analyzed results. The stableness, effectiveness and practice of the method has been confirmed by the voloeity model building of setsmic data in Daqing model and real seismic data.
