公开(公告)号：US20170285204A1

公开(公告)日：2017-10-05

申请号：US15510955

申请日：2015-09-10

申请人： SHELL OIL COMPANY

发明人： Johan Cornelis HORNMAN ,  Peter Berkeley WILLS ,  Jorge Luis LOPEZ ,  Albena Alexandrova MATEEVA

IPC分类号： G01V1/42 ,  G01V1/36 ,  G01H9/00

CPC分类号： G01V1/42 ,  G01H9/004 ,  G01V1/36 ,  G01V2210/1429 ,  G01V2210/56

摘要： A method may include providing a sensor in a first wellbore segment, providing a sensor in a second wellbore segment, observing upgoing acoustic waves or downgoing acoustic waves with the sensors, and separating the upgoing acoustic waves and/or the downgoing acoustic waves from a total wavefield. The first wellbore segment and the second wellbore segment may be separated by a distance. At least one of the wellbore segments may be non-vertical and/or the first wellbore segment may not be parallel to the second wellbore segment. The first wellbore segment may be part of a first set of wellbores and the second wellbore segment may be part of a second set of wellbores. The separated upgoing and downgoing acoustic waves may be used to generate deghosted data.

公开(公告)号：US20170371057A1

公开(公告)日：2017-12-28

申请号：US15538125

申请日：2015-12-22

申请人： SHELL OIL COMPANY

发明人： Albena Alexandrova MATEEVA ,  Peter Berkeley WILLS ,  Jorge Luis LOPEZ ,  Johan Cornelis HORNMAN

IPC分类号： G01V1/42 ,  G01V1/02

CPC分类号： G01V1/42 ,  G01V1/02 ,  G01V2210/1299 ,  G01V2210/163

摘要： 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.