三维地震观测系统OVT属性评价方法  

OVT attribute evaluation method of 3Dseismic geometry

作　　者：瞿长青[1] 李传强[1] 蒋先勇[1] 张松平[1] 王莉[1] QU Changqing;LI Chuangqiang;JIANG Xianyong;ZHANG Songping;WANG Li(Zhongyuan Geophysical Research Institute,SINOPEC Puyang,Henan457001,China)

机构地区：[1]中国石化中原油田分公司物探研究院,河南濮阳457001

出　　处：《石油地球物理勘探》2023年第3期550-557,共8页Oil Geophysical Prospecting

基　　金：中国石化科技部技术攻关项目“东濮凹陷高密度地震勘探关键技术研究与应用”(P22146)资助。

摘　　要：宽方位、高密度地震勘探技术在现阶段的常规及非常规油气勘探开发中发挥着越来越重要的作用。作为主要针对宽方位地震数据处理的OVT(Offset Vector Tile)技术,经多年的发展与沉淀,现已处于大规模工业应用阶段;但在设计宽方位、高密度三维地震观测系统时,因未充分考虑三维观测系统的OVT属性,从而影响后续OVT处理和OVT域五维地震资料解释,使最终的OVT应用效果达不到预期。文中研讨了三维地震观测系统OVT属性均匀性定量计算方法,即先从三维正交观测系统提取对应的OVT,计算各个OVT的炮检距和方位角属性,并统计每个OVT的平均炮检距和方位角,作为该OVT的标准值,求取每个OVT均方差值作为该OVT属性的评价指标;最后用全部OVT属性评价指标的平均值及各OVT属性评价指标的均方差值定量评价观测系统的OVT属性。对应值越小,说明观测系统的OVT属性越好,对应值越大,则说明该观测系统的OVT属性越差。Wide-azimuth and high-density seismic exploration technology plays an increasingly important role in the exploration and development of oil and gas nowadays.The offset vector tile(OVT)technology for wideazimuth and high-density seismic exploration is now in the stage of large-scale industrial application after years of technical development.However,the current design of high-density and wide-azimuth 3Dseismic geometry does not fully consider OVT attributes.As a result,the subsequent OVT processing and five-dimensional seismic interpretation in the OVT domain are affected and the final application effect of OVT technology cannot meet the expectations.This paper studies the quantitative calculation method of OVT attribute uniformity in 3Dseismic geometry.Firstly,the corresponding OVT is extracted from the 3Dorthogonal observation system.Secondly,the offset and azimuth attributes of each OVT are calculated,and the average offset and azimuth of each OVT are counted as the standard value of the OVT.In addition,the mean square difference of each OVT is calculated as the OVT attribute evaluation value.Finally,OVT attributes of the 3Dseismic geometry are quantitatively evaluated by the mean values and mean square difference of all OVT attribute evaluation values.The results show that the smaller corresponding value leads to better OVT attributes of the 3Dseismic geometry,and the larger corresponding value results in poorer OVT attributes of the geometry.

关 键 词：三维地震 观测系统 OVT 炮检距 方位角 评价 

分 类 号：P631[天文地球—地质矿产勘探]