Joint Inversion of Subsurface Resistivity and Noise Parameters

Patent metadata

Field	Value
Publication number	US-2016238735-A1
Application number	US-201615002101-A
Country	US
Kind code	A1
Filing date	Jan 20, 2016
Priority date	Feb 16, 2015
Publication date	Aug 18, 2016
Grant date	—

Abstract

A method for jointly inverting subsurface resistivities and noise parameters that may comprise the steps of identifying electromagnetic data acquired from one or more electromagnetic sensors, wherein the electromagnetic data includes a source-generated signal and noise, and jointly inverting at least subsurface resistivities and noise parameters based on the electromagnetic data. A marine electromagnetic survey system, that may comprise a data processing system configured to identify electromagnetic data acquired from one or more electromagnetic sensors, wherein the electromagnetic data includes a source-generated signal and noise and jointly invert subsurface resistivities and noise based on the electromagnetic data. A non-transitory machine-readable medium storing instructions executable by a data processing system that may cause the machine to identify electromagnetic data acquired from one or more electromagnetic sensors, wherein the electromagnetic data includes a source-generated signal and noise, and jointly invert subsurface resistivities and noise based on the electromagnetic data.

First claim

What is claimed:

1 . A method, comprising:
identifying electromagnetic data acquired from one or more electromagnetic sensors, wherein the electromagnetic data includes a source-generated signal and noise; and jointly inverting at least subsurface resistivities and noise parameters based on the electromagnetic data.

2 . The method of claim 1 , wherein the step of jointly inverting comprises averaging over possible noise parameters.

3 . The method of claim 1 , wherein the step of jointly inverting comprises simultaneous modeling of electromagnetic earth responses and noise parameters.

4 . The method of claim 1 , wherein the step of jointly inverting comprises minimizing a misfit expression with respect to subsurface resistivities and noise parameters with a weight structure that is fixed.

5 . The method of claim 1 , wherein the electromagnetic data that is identified is electromagnetic data that has not been processed.

6 . The method of claim 1 further comprising producing a geophysical data product from at least the subsurface resistivities and storing the geophysical data product on a tangible, non-volatile computer-readable medium suitable for importing onshore.

7 . The method of claim 6 , further comprising importing the geophysical data product onshore and performing further data processing or geophysical analysis on the geophysical data product.

8 . The method of claim 1 , further comprising acquiring the electromagnetic data for a marine electromagnetic survey using the electromagnetic sensors.

9 . The method of claim 8 , wherein the electromagnetic sensors are disposed on a streamer towable by a survey vessel, located on an ocean bottom cable, or fixed at or near a water bottom.

10 . The method of claim 8 , further comprising activating an electromagnetic energy source to generate an electromagnetic field.

11 . The method of claim 1 , further comprising identifying noise parameters with recorded auxiliary data

12 . A marine electromagnetic survey system, comprising
a data processing system configured to at least: (i) identify electromagnetic data acquired from one or more electromagnetic sensors, wherein the electromagnetic data includes a source-generated signal and noise; and (ii) jointly invert subsurface resistivities and noise parameters based on the electromagnetic data.

13 . The system of claim 12 , further comprising a streamer, wherein the streamer comprises the one or more electromagnetic sensors.

14 . The system of claim 13 , wherein the streamer is configured to be at least one of located on a streamer towable by a survey vessel, located on an ocean bottom cable, or fixed at or near a water bottom.

15 . The system of claim 12 , wherein the one or more electromagnetic sensors comprise at least one of receiver electrodes or magnetometers.

16 . The system of claim 14 , wherein the electromagnetic data that is identified is unprocessed.

17 . The system of claim 12 , where the data processing system is configured to jointly invert subsurface resistivities and noise parameters using at least simultaneous modeling of earth responses and noise parameters.

18 . The system of claim 12 , where the data processing system is configured to jointly invert subsurface resistivities and noise parameters by at least minimizing a misfit expression with respect to subsurface resistivities and noise parameters with a weight structure that is fixed.

19 . A non-transitory machine-readable medium storing instructions executable by a data processing system to cause the machine to:
identify electromagnetic data acquired from one or more electromagnetic sensors, wherein the electromagnetic data includes a source-generated signal and noise; and jointly invert subsurface resistivities and noise parameters based on the electromagnetic data.

20 . The non-transitory machine-readable medium of claim 19 , wherein the instructions further cause the machine to jointly invert subsurface resistivities and noise parameters using at least simultaneous modeling of earth responses and noise parameters.

21 . The non-transitory machine-readable medium of claim 19 , wherein the instructions further cause the machine to jointly invert subsurface resistivities and noise parameters by at least minimizing a misfit expression with respect to subsurface resistivities and noise parameters with a weight structure that is fixed.

Assignees

• Pgs Geophysical As

Inventors

• Björnemo Lars Erik Magnus
• Skogman Carl Joel Gustav

Classifications

• G01V2003/084

  Sources · CPC title

• G01V3/10

  using induction coils · CPC title

• G01V3/083

  Controlled source electromagnetic [CSEM] surveying · CPC title

• G01V3/081

  the magnetic field is produced by the objects or geological structures (characterised by the method of magnetic field measurement G01R33/00) · CPC title

• G01V3/08

  operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices (with electromagnetic waves G01V3/12) · CPC title