Data-driven separation of upgoing free-surface multiples for seismic imaging
AssigneeSchlumberger Technology Corporation
InventorsPhilippe Caprioli, Paal Kristiansen
Life of this patent
Estimating the term…
Abstract
A method includes receiving seismic data including signals collected using a receiver, the seismic data representing a subsurface volume, identifying a downgoing wavefield and an upgoing wavefield in the seismic data, identifying direct arrivals in the downgoing wavefield, estimating at least first-order multiple reflection signals in the upgoing wavefield based on the downgoing wavefield, the upgoing wavefield, and the direct arrivals, and generating seismic images representing the subsurface volume based at least in part on the at least first-order multiple reflection signals.
Claims15
A method, comprising:
- receiving seismic data comprising signals collected using a receiver, the seismic data representing a subsurface volume;
- identifying a downgoing wavefield and an upgoing wavefield in the seismic data;
- identifying direct arrivals in the downgoing wavefield;
- estimating at least first-order multiple reflection signals in the upgoing wavefield based on the downgoing wavefield, the upgoing wavefield, and the direct arrivals, wherein estimating the at least first-order multiple reflection signals comprises estimating first and higher multiple reflection signals by:
- generating an intermediate wavefield by subtracting the direct arrivals from the downgoing wavefield;
- deconvolving the downgoing wavefield from the intermediate wavefield to generate a second intermediate wavefield;
- and
- convolving the second intermediate wavefield with the upgoing wavefield;
- and
- generating seismic images representing the subsurface volume based at least in part on the at least first-order multiple reflection signals.
A non-transitory computer-readable medium storing instructions that, when executed by at least one processor of a computing system, cause the computing system to perform operations, the operations comprising:
- receiving seismic data comprising signals collected using a receiver, the seismic data representing a subsurface volume;
- identifying a downgoing wavefield and an upgoing wavefield in the seismic data;
- identifying direct arrivals in the downgoing wavefield;
- estimating at least first-order multiple reflection signals in the upgoing wavefield based on the downgoing wavefield, the upgoing wavefield, and the direct arrivals, wherein estimating the at least first-order multiple reflection signals comprises:
- subtracting the direct arrivals from the downgoing wavefield to generate a first intermediate wavefield;
- deconvolving the downgoing wavefield from the first intermediate wavefield to generate a second intermediate wavefield;
- deconvolving the downgoing wavefield from the upgoing wavefield to generate a third intermediate wavefield;
- and
- convolving the direct arrivals, the second intermediate wavefield, and the third intermediate wavefield, so as to estimate the at least first-order multiple reflection signals in the upgoing wavefield;
- and
- generating seismic images representing the subsurface volume based at least in part on the at least first-order multiple reflection signals.
A computing system, comprising:
- one or more processors;
- and
- a memory system including one or more non-transitory computer-readable media storing instructions that, when executed by at least one of the one or more processors, cause the computing system to perform operations, the operations comprising:
- receiving seismic data comprising signals collected using a receiver, the seismic data representing a subsurface volume;
- identifying a downgoing wavefield and an upgoing wavefield in the seismic data;
- identifying direct arrivals in the downgoing wavefield;
- estimating at least first-order multiple reflection signals in the upgoing wavefield based on the downgoing wavefield, the upgoing wavefield, and the direct arrivals, wherein estimating the at least first-order multiple reflection signals comprises estimating first and higher multiple reflection signals by:
- generating an intermediate wavefield by subtracting the direct arrivals from the downgoing wavefield;
- deconvolving the downgoing wavefield from the intermediate wavefield to generate a second intermediate wavefield;
- and
- convolving the second intermediate wavefield with the upgoing wavefield;
- and
- generating seismic images representing the subsurface volume based at least in part on the at least first-order multiple reflection signals.
Dependencies are inferred from the claim text.