Quick 4D detection seismic survey
AssigneeSpotlight
InventorHabib Alkhatib
Life of this patent
Estimating the term…
Abstract
A method for monitoring a subsurface during a 4-dimensional (4D) survey. The method includes obtaining an area of the subsurface that needs to be monitored; identifying receiver and source locations for the area and source frequencies to be emitted into the area based on demigration or inverse ray tracing; performing a light base survey for the area; performing a light monitor survey for the area; and generating an image of the area based on a comparison of (i) the light base survey, and (ii) the light monitor survey for the area.
Claims20
A method for monitoring a subsurface during a 4-dimensional (4D) survey, the method comprising:
- obtaining a full survey of the subsurface;
- identifying receiver and source locations and source frequencies to be emitted during light surveys based on demigration or inverse ray tracing of the full survey;
- performing a light base survey according to the receiver and source locations and the source frequencies;
- performing a light monitor survey according to the receiver and source locations and the source frequencies;
- and
- generating an image of changes in the subsurface based on a comparison of (i) the light base survey, and (ii) the light monitor survey,
- wherein any of the light surveys yields substantially less data than obtained during the full survey.
A computing device for monitoring a subsurface during a 4-dimensional (4D) survey, the computing device comprising:
- an interface for
- receiving a full survey of the subsurface,
- obtaining first seismic data associated with a light base survey,
- obtaining second seismic data associated with a light monitor survey, and
- a processor connected to the interface and configured to
- identify receiver and source locations and source frequencies to be emitted for light surveys based on demigration or inverse ray tracing of the full survey, and
- generate an image of changes in the subsurface based on a comparison of (i) the first seismic data from the light base survey and (ii) the second seismic data from the light monitor survey
- wherein any of the light surveys yields substantially less data than obtained during the full survey.
A non-transitory computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor, implement instructions for monitoring a subsurface during a 4-dimensional (4D) survey, the instructions comprising:
- obtaining a full survey of the subsurface;
- identifying receiver and source locations and source frequencies to be emitted during light surveys based on demigration or inverse ray tracing of the full survey;
- performing a light base survey according to the receiver and source locations and the source frequencies;
- performing a light monitor survey according to the receiver and source locations and the source frequencies;
- and
- generating an image of changes in the subsurface based on a comparison of (i) the light base survey and (ii) the light monitor survey,
- wherein any light survey yields substantially less data than obtained during the full survey.
Dependencies are inferred from the claim text.