Method and system for simultaneous acquisition of pressure and pressure derivative data with ghost diversity
AssigneeCgg Services SAS
InventorsRisto Siliqi, Karine Desrues
Life of this patent
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Abstract
A marine streamer spread for acquiring seismic data, the spread including a streamer having a first portion and a second portion; the first portion including both first pressure sensors and pressure derivative sensors for acquiring the seismic data; and the second portion including second pressure sensors. The first portion imparts ghost diversity to the seismic data by having a variable-depth profile and the pressure derivative sensors impart polarity diversity to the seismic data.
Claims17
A marine streamer spread for acquiring seismic data, the spread comprising:
- a streamer having a first portion and a second portion;
- the first portion including both first pressure sensors and pressure derivative sensors for acquiring first pressure wave-fields and pressure derivatives wave-fields;
- and
- the second portion including only second pressure sensors for acquiring second pressure wave-fields,
- wherein the first portion is configured to have a variable-depth profile so that notches of a pressure amplitude spectrum of the acquired first and second pressure wave-fields are filled with energy from a pressure derivative amplitude spectrum of the acquired pressure derivatives wave-fields.
A method for processing input seismic data d, the method comprising:
- receiving the input seismic data d recorded in a first domain by seismic sensors that travel in water, the input seismic data d including up-going and down-going wave-fields;
- generating a model p in a second domain to describe the input seismic data d;
- and
- processing with a processor the model p to obtain an output seismic dataset indicative of a surveyed subsurface,
- wherein the input seismic data d includes (1) first pressure wave-fields acquired with first pressure sensors located on a first portion of a streamer, (2) pressure derivative wave-fields acquired with pressure derivative sensors located on the first portion of the streamer, and (3) second pressure wave-fields acquired with second pressure sensors located on a second portion of the streamer, and
- wherein the first portion is configured to have a variable-depth profile so that notches of a pressure amplitude spectrum of the first and second pressure wave-fields are filled with energy from a pressure derivative amplitude spectrum of the pressure derivatives wave-fields.
A non-transitory computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor, implement instructions for processing input seismic data d, the instructions comprising:
- receiving the input seismic data d recorded in a first domain by seismic sensors that travel in water, the input seismic data d including up-going and down-going wave-fields;
- generating a model p in a second domain to describe the input seismic data d;
- and
- processing with a processor the model p to obtain an output seismic dataset indicative of a surveyed subsurface,
- wherein the input seismic data d includes (1) first pressure wave-fields acquired with first pressure sensors located on a first portion of a streamer, (2) pressure derivatives wave-fields acquired with pressure derivative sensors located on the first portion of the streamer, and (3) second pressure wave-fields acquired with second pressure sensors located on a second portion of the streamer, and
- wherein the first portion is configured to have a variable-depth profile so that notches of a pressure amplitude spectrum of the first and second pressure wave-fields are filled with energy from a pressure derivative amplitude spectrum of the pressure derivatives wave-fields.
Dependencies are inferred from the claim text.