[특허]Simultaneous shooting nodal acquisition seismic survey methods

Simultaneous shooting nodal acquisition seismic survey methods 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01V-001/24 G01V-001/38
출원번호	US-0652798 (2017-07-18)
등록번호	US-10234579 (2019-03-19)
발명자 / 주소	Marc, Etienne Ray, Clifford H. Thompson, James Nelson
출원인 / 주소	MAGSEIS FF LLC
대리인 / 주소	Foley & Lardner LLP
인용정보	피인용 횟수 : 0 인용 특허 : 42

초록

A method of performing a seismic survey including: deploying nodal seismic sensors at positions in a survey region; activating a plurality of seismic sources; and using the nodal seismic sensors to record seismic signals generated in response to the activation of the plurality of signals.

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1. A system to acquire blended seismic signals, comprising: a plurality of seismic sources of a survey region that activate based on a ratio of a dither time to a shot interval that is less than or equal to ½, wherein the dither time indicates a delay between two shots from two different seismic sources of the plurality of seismic sources and the shot interval indicates a delay between two shots from an individual seismic source of the plurality of seismic sources;a plurality of seismic sensor units deployed at a plurality of positions in the survey region to record seismic signals generated in response to activation of the plurality of seismic sources, wherein at least one of the plurality of seismic sensor units includes: at least one geophone disposed within the at least one of the plurality of seismic sensor units to continuously operate while on an ocean bottom to record seismic signals;at least one clock disposed within the at least one of the plurality of seismic sensor units;at least one power source disposed within the at least one of the plurality of seismic sensor units;at least one memory disposed within the at least one of the plurality of seismic sensor units to store seismic data while on the ocean bottom; andat least one accelerometer disposed within the at least one of the plurality of seismic sensor units; andone or more processors to deblend, based on a timing function that includes the ratio of the dither time to the shot interval that is less than or equal to ½, the seismic signals recorded by the plurality of seismic sensor units to generate data representing subsurface structures indicative of oil or gas. 2. The system of claim 1, wherein the at least one of the plurality of seismic sensor units does not receive or transmit an external control communication while on the ocean bottom. 3. The system of claim 1, wherein the at least one of the plurality of seismic sensor units has a width that is greater than a height of the at least one of the plurality of seismic sensor units. 4. The system of claim 1, wherein each of the plurality of seismic sensor units comprises: a disk-shaped water tight case formed of two parallel plates joined around a periphery by a wall. 5. The system of claim 1, wherein the at least one of the plurality of seismic sensor units comprises a tilt meter disposed within the at least one of the plurality of seismic sensor units to obtain information applied to correct the at least one clock for gravitational effects. 6. The system of claim 1, wherein the at least one of the plurality of seismic sensor units comprises a water tight case housing the at least one geophone. 7. The system of claim 1, wherein the at least one of the plurality of seismic sensor units is configured to record the seismic signals with the at least one of the plurality of seismic sensor units disposed on the ocean bottom. 8. The system of claim 1, comprising: the plurality of seismic sources configured to activate based on a modulation signature configured to identify each of the plurality of seismic sources. 9. The system of claim 1, wherein the dither time includes a variable dither time, the system comprising: a first seismic source of the plurality of seismic sources configured to activate at a first time; anda second seismic source of the plurality of seismic sources configured to activate at a second time separated by the first time based on the variable dither time. 10. The system of claim 1, comprising: the plurality of seismic sources configured to move from a first location to a second location in accordance with a movement pattern. 11. A method of acquiring blended seismic signals, comprising: deploying a plurality of seismic sensor units at a plurality of positions in a survey region to record seismic signals generated in response to activation of a plurality of seismic sources, wherein at least one of the plurality of seismic sensor units includes: at least one geophone disposed within the at least one of the plurality of seismic sensor units to continuously operate while on an ocean bottom to record seismic signals;at least one clock disposed within the at least one of the plurality of seismic sensor units;at least one power source disposed within the at least one of the plurality of seismic sensor units;at least one memory disposed within the at least one of the plurality of seismic sensor units to store seismic data while on the ocean bottom; andat least one accelerometer disposed within the at least one of the plurality of seismic sensor units;activating the plurality of seismic sources of the survey region based on a ratio of a dither time to a shot interval that is less than or equal to ½, wherein the dither time indicates a delay between two shots from two different seismic sources of the plurality of seismic sources and the shot interval indicates a delay between two shots from an individual seismic source of the plurality of seismic sources; anddeblending, by one or more processors, based on a timing function that includes the ratio of the dither time to the shot interval that is less than or equal to ½, the seismic signals recorded by the plurality of seismic sensor units to generate data representing subsurface structures indicative of oil or gas. 12. The method of claim 11, wherein the at least one of the plurality of seismic sensor units does not receive or transmit an external control communication while on the ocean bottom. 13. The method of claim 11, wherein the at least one of the plurality of seismic sensor units has a width that is greater than a height of the at least one of the plurality of seismic sensor units. 14. The method of claim 11, wherein each of the plurality of seismic sensor units comprises: a disk-shaped water tight case formed of two parallel plates joined around a periphery by a wall. 15. The method of claim 11, wherein the at least one of the plurality of seismic sensor units comprises a tilt meter disposed within the at least one of the plurality of seismic sensor units, the method comprising: obtaining, by the tilt meter, information to apply to correct the at least one clock for gravitational effects. 16. The method of claim 11, wherein the at least one of the plurality of seismic sensor units comprises a water tight case housing the at least one geophone. 17. The method of claim 11, comprising: recording, by the at least one of the plurality of seismic sensor units disposed on the ocean bottom, the seismic signals. 18. The method of claim 11, comprising: activing the plurality of seismic sources based on a modulation signature configured to identify each of the plurality of seismic sources. 19. The method of claim 11, wherein the dither time includes a variable dither time, the method comprising: activing a first seismic source of the plurality of seismic sources at a first time; andactivating a second seismic source of the plurality of seismic sources at a second time separated by the first time based on the variable dither time. 20. The method of claim 11, comprising: moving the plurality of seismic sources from a first location to a second location in accordance with a movement pattern.

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Simultaneous shooting nodal acquisition seismic survey methods 원문보기

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Simultaneous shooting nodal acquisition seismic survey methods 원문보기

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