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US 9,069,096 B2Granted
Method of processing marine CSEM data
AssigneeStatoil Petroleum AS
InventorsLars Løseth, Lasse Amundsen
Life of this patent
Estimating the term…
Abstract
A method is provided for processing marine controlled source electromagnetic data. Inline and broadside marine controlled source electromagnetic data are provided, for example by means of one or more horizontal electric dipoles and one or more receivers disposed in a water column above a subsurface to be surveyed. A linear combination of the inline and broadside data is formed so as to reduce the airwave content.
Claims16
A method of processing marine controlled source electromagnetic data, comprising the steps of:
- providing inline and broadside marine controlled source electromagnetic data comprising inline and broadside electromagnetic field components;
- and
- forming a linear combination of the inline and broadside field components to reduce airwave content,
- wherein the inline and broadside data comprise inline and broadside electric data comprising inline and broadside electric field components, and
- wherein the step of forming the linear combination comprises forming a difference between the inline electric field component(s) and weighted broadside electric field component(s), the weighted broadside electric field component(s) being weighted by a first weighting factor.
2 more elements
A method of processing marine controlled source electromagnetic data, comprising the steps of:
- providing inline and broadside marine controlled source electromagnetic data comprising inline and broadside electromagnetic field components;
- and
- forming a linear combination of the inline and broadside field components to reduce airwave content,
- wherein the inline and broadside data comprise inline and broadside magnetic data comprising inline and broadside magnetic field components, and
- wherein the step of forming the linear combination comprises forming a sum of the inline magnetic field component(s) and weighted broadside magnetic field component(s), the weighted broadside magnetic field components(s) being weighted by a second weighting factor.
2 more elements
A computer program embodied on a non-transitory computer-readable medium for controlling a computer to perform a method of processing marine controlled source electromagnetic data, the method comprising:
- providing inline and broadside marine controlled source electromagnetic data comprising inline and broadside electromagnetic field components;
- and
- forming a linear combination of the inline and broadside field components to reduce airwave content,
- wherein the inline and broadside data comprise at least one of inline and broadside electric data comprising inline and broadside electric field components or inline and broadside magnetic data comprising inline and broadside magnetic field components, and
- wherein the step of forming the linear combination comprises at least one of forming a difference between the inline electric field component(s) and weighted broadside electric field component(s), the weighted broadside electric field component(s) being weighted by a first weighting factor or forming a sum of the inline magnetic field component(s) and weighted broadside magnetic field component(s), the weighted broadside magnetic field components(s) being weighted by a second weighting factor.
2 more elements
A non-transitory computer-readable medium comprising instructions for performing a method on a computer of processing marine controlled source electromagnetic data, the method comprising:
- providing inline and broadside marine controlled source electromagnetic data comprising inline and broadside electromagnetic field components;
- and
- forming a linear combination of the inline and broadside field components to reduce airwave content,
- wherein the inline and broadside data comprise at least one of inline and broadside electric data comprising inline and broadside electric field components or inline and broadside magnetic data comprising inline and broadside magnetic field components, and
- wherein the step of forming the linear combination comprises at least one of forming a difference between the inline electric field component(s) and weighted broadside electric field component(s), the weighted broadside electric field component(s) being weighted by a first weighting factor or forming a sum of the inline magnetic field component(s) and weighted broadside magnetic field component(s), the weighted broadside magnetic field components(s) being weighted by a second weighting factor.
2 more elements
An apparatus comprising:
- a computer programmed by a computer program embodied on a non-transitory computer-readable medium for controlling the computer to perform a method of processing marine controlled source electromagnetic data by:
- providing inline and broadside marine controlled source electromagnetic data comprising inline and broadside electromagnetic field components;
- and
- forming a linear combination of the inline and broadside field components to reduce airwave content,
- wherein the inline and broadside data comprise at least one of inline and broadside electric data comprising inline and broadside electric field components or inline and broadside magnetic data comprising inline and broadside magnetic field components, and
- wherein the step of forming the linear combination comprises at least one of forming a difference between the inline electric field component(s) and weighted broadside electric field component(s), the weighted broadside electric field component(s) being weighted by a first weighting factor or forming a sum of the inline magnetic field component(s) and weighted broadside magnetic field component(s), the weighted broadside magnetic field components(s) being weighted by a second weighting factor.
3 more elements
A system for processing marine controlled source electromagnetic data comprising:
- a computer including at least one data processor;
- and
- a non-transitory computer-readable medium programmed with instructions to cause the computer to:
- provide inline and broadside marine controlled source electromagnetic data comprising inline and broadside electromagnetic field components;
- and
- form a linear combination of the inline and broadside field components to reduce airwave content,
- wherein the inline and broadside data comprise at least one of inline and broadside electric data comprising inline and broadside electric field components or inline and broadside magnetic data comprising inline and broadside magnetic field components, and
- wherein the step of forming the linear combination comprises at least one of forming a difference between the inline electric field component(s) and weighted broadside electric field component(s), the weighted broadside electric field component(s) being weighted by a first weighting factor or forming a sum of the inline magnetic field component(s) and weighted broadside magnetic field components), the weighted broadside magnetic field components(s) being weighted by a second weighting factor.
5 more elements
Dependencies are inferred from the claim text.