摘要
本文利用直达波的旅行时与反射波的旅行时联合反演两井之间的速度分布,在计算方法中加入声波测井获得边界上的先验信息,如慢度分布和反射层位置,可提高计算时的收敛性能与计算效率。在层析反演过程中,采用阻尼LSQR算法求解,在求解的过程中施加一定的阻尼,能有效地抑制数据误差较大时的影响,提高反演的抗噪声能力。应用正演模型验证了方法的可行性。实际资料处理表明,该方法的层析速度纵、横向分辨率较高,在井旁与声波速度吻合较好,计算精度较高。
The paper discusses a joint tomography of direct wave traveltime and reflection wave traveltime in crosswell seismic.Using direct wave traveltime and reflection wave traveltime between wells with well information such as slowness distributions and reflection interface positions,this tomography method benefits a good astringency.The damp LSQR arithmetic is applied in the tomography procedure.It can effectively improve de-noise ability.Its application to the forward modeling proves its feasibility.Applications to field datasets indicate that high resolutions are obtained for both vertical and horizontal direction;and good velocity matching around the wells.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2011年第2期226-231,158-159,共6页
Oil Geophysical Prospecting
基金
国家"863"计划"油藏综合地球物理技术"课题(No.2007AA060500)资助
关键词
井间地震
直达波
反射波
层析成像
crosswell seismic,direct wave,reflection,tomography
