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    • 8. 发明公开
    • METHOD OF AND SYSTEM FOR CREATING A SEISMIC PROFILE
    • 用于创建地震剖面的方法和系统
    • EP3237934A1
    • 2017-11-01
    • EP15830930.2
    • 2015-12-22
    • Shell Internationale Research Maatschappij B.V.
    • MATEEVA, Albena AlexandrovaWILLS, Peter BerkeleyLOPEZ, Jorge LuisHORNMAN, Johan Cornelis
    • G01V1/02G01V1/42
    • G01V1/42G01V1/02G01V2210/1299
    • A seismic source (50) is buried in a multi-layered subsurface formation below a fast layer (30) and above a reflecting interface (10). The seismic source (50) excites a critically refracted (CR) wave that travels laterally along a fast layer bottom interface (35), and emanates downwardly into a slow layer (40) that is below and adjacent to the fast layer (30). One or more receivers (60), positioned below the fast layer (30) and above the reflecting interface (10) are used to detect seismic waves (84, 86). The one or more receivers (60) are positioned within a borehole (65). At least one reflected CR wave is isolated from the received signals, which is a CR wave that has reflected off of the reflecting layer (10) below the one or more receivers (60). A seismic profile of the multi-layered subsurface formation is created, using the at least one reflected CR wave. Time-lapse seismic monitoring of hydrocarbon extraction operations, such as steam injection, is also provided.
    • 地震源(50)埋藏在快层(30)下方和反射界面(10)上方的多层地下地层中。 地震源(50)激发沿快层底界面(35)横向传播的临界折射(CR)波,并向下发射进入快层(30)下方并与其相邻的慢层(40)。 位于快层(30)下方和反射界面(10)上方的一个或多个接收器(60)用于检测地震波(84,86)。 一个或多个接收器(60)位于钻孔(65)内。 至少一个反射的CR波与接收到的信号隔离,CR信号是从一个或多个接收器(60)下面的反射层(10)反射的CR波。 使用至少一个反射的CR波来创建多层地下地层的地震剖面。 还提供了碳氢化合物提取操作(如蒸汽注入)的延时地震监测。