摘要
井间地震反射波成像比井间速度层析成像具有更高的分辨率,井间地震反射波成像剖面能用于井间储层精细解释。本文采用非均匀介质的射线追踪算法,按照实际井间地震观测系统计算共炮点道集(或共接收点道集)的反射波时间场,然后将反射波能量在共反射点上叠加,得到井间地震反射波成像剖面。其具体做法分三步:1计算各反射点的反射波旅行时,包括上、下行反射波;2按一定的观测方式(如共炮点、共接收点、共偏移距、共中心点、共深度点)进行上、下行波分离;3分别对上、下行反射波进行共反射点叠加成像并合并。通过理论模型和实际资料处理。
The image of crosshole seismic reflection wave has higher resolution than the tomographic image of crosshole seismic velocity does; and the section of crosshole seismic reflection wave may be applied to minute interpretation of crosshole reservoir. The time field of reflection wave of common shot trace gather ( or common receiver trace gather ) is computed by taking ray tracing in nonuniform medium according to real crosshole seismic observation system; and then the image section of crosshole seismic reflection wave can be produced by stacking reflection energies at common reflection point. This can be achieved in the following steps: ·Computing the travel times of upgoing and downgoing reflection waves at each reflection point; ·Separating upgoing wave from downgoing wave according to a given way (common shot, common receiver, common offset, common mid point or common depth point); ·The upgoing wave and downgoing wave undergo CRP stacking respectively, then they are merged into a single section; Both theoretical model and real data processing bring good crosshole seismic sections.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2000年第1期36-41,63,共7页
Oil Geophysical Prospecting
关键词
井间地震
数据处理
反射波
测量数据
地震勘探
crosshole seism, data processing,reflection wave, stack,resolution, reservoir,reservoir description
