%0 Journal Article
%T Common-angle gathers based on Kirchhoff pre-stack time migration<br>Kirchhoff叠前时间偏移角度道集
%A 邹振
%A 刘洪
%A 刘红伟
%J 地球物理学报
%D 2010
%I 
%X In this paper we present the improved algorithm for common-angle gathers based on Kirchhoff pre-stack time migration. The algorithm can calculate relatively true incident angle under three-dimensional circumstance, while the traditional ray-parameter method could not handle the incident angle for the dipping events. Compared with the straight-ray Kirchhoff angle domain gathers method proposed in recent years, our method is able to extract much wider angle for taking interval velocity and ray bending effect into account. Moreover, we apply non-hyperbolic moveout equation to calculate the travel time, thus the common-angle gathers are flatter at the large angle than straight ray method. Efficient true-amplitude weighting function as well as hit-count correction is beneficial for AVA inversion. The results of synthetic model data have verified that compared with angle gathers transformed from offset to angle domain with CMP gathers and CRP gathers after migration, the common-angle gathers based on Kirchhoff pre-stack time migration have the following advantages: much more accurate incident angle, the effect of amplitude versus angle (AVA) is robust and clear. The real 3-D data test showed that the angle gathers provided with our method were beneficial for AVA analysis and AVA inversion, and could improve pre-stack inversion resolution.
%K Kirchhoff PSTM
%K Common-angle gathers (CAG)
%K Angle-domain common image gathers (ADCIG)<br>Kirchhoff叠前时间偏移
%K 角度道集
%K 角度域共像点道集
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=608CEA7D719544C0F5F41102FB53C9FE&yid=140ECF96957D60B2&vid=8E6AB9C3EBAAE921&iid=94C357A881DFC066&sid=86CBF6E43FA9E551&eid=4BE5C218638B5C80&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=2&reference_num=33