3D CSEM over Frigg ‐ dealing with cultural noise

Price, Antony; Mikkelsen, G.; Hamilton, Mark F.

doi:10.1190/1.3513872

Cited by 11 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to modelling the effects of borehole casings, our algorithm could find application in modelling the effects of metal pipelines resting on the seafloor in the vicinity of a marine CSEM survey, a problem described in Price, Mikkelsen and Hamilton (2010). This would require the pipelines to be approximated by horizontal, rather than vertical, conductive tubes, resting on the seafloor.…”

Section: Discussionmentioning

confidence: 99%

The marine controlled source electromagnetic response of a steel borehole casing: applications for the NEPTUNE Canada gas hydrate observatory

Swidinsky¹,

Edwards²,

Jegen³

2013

Geophysical Prospecting

View full text Add to dashboard Cite

Gas hydrates are a potential energy resource, a possible factor in climate change and an exploration geohazard. The University of Toronto has deployed a permanent seafloor time‐domain controlled source electromagnetic (CSEM) system offshore Vancouver Island, within the framework of the NEPTUNE Canada underwater cabled observatory. Hydrates are known to be present in the area and due to their electrically resistive nature can be monitored by 5 permanent electric field receivers. However, two cased boreholes may be drilled near the CSEM site in the near future. To understand any potential distortions of the electric fields due to the metal, we model the marine electromagnetic response of a conductive steel borehole casing. First, we consider the commonly used canonical model consisting of a 100 Ωm, 100 m thick resistive hydrocarbon layer embedded at a depth of 1000 m in a 1 Ωm conductive host medium, with the addition of a typical steel production casing extending from the seafloor to the resistive zone. Results show that in both the frequency and time domains the distortion produced by the casing occurs at smaller transmitter‐receiver offsets than the offsets required to detect the resistive layer. Second, we consider the experimentally determined model of the offshore Vancouver Island hydrate zone, consisting of a 5.5 Ωm, 36 m thick hydrate layer overlying a 0.7 Ωm sedimentary half‐space, with the addition of two borehole casings extending 300 m into the seafloor. In this case, results show that the distortion produced by casings located within a 100 m safety zone of the CSEM system will be measured at 4 of the 5 receivers. We conclude that the boreholes must be positioned at least 200 m away from the CSEM array so as to minimize the effects of the casings.

show abstract

Section: Discussionmentioning

confidence: 99%

The marine controlled source electromagnetic response of a steel borehole casing: applications for the NEPTUNE Canada gas hydrate observatory

Swidinsky¹,

Edwards²,

Jegen³

2013

Geophysical Prospecting

View full text Add to dashboard Cite

show abstract

“…These metallic structures include pipeline networks, well casings and subsea production templates. A study in 2010 revealed the contamination of CSEM data by pipeline interference [ 49 ]. Park et al and Morten et al [ 15 , 50 ] suggested different ways of circumventing and dealing with pipeline interference.…”

Section: Discussionmentioning

confidence: 99%

Time-Lapse 3D CSEM for Reservoir Monitoring Based on Rock Physics Simulation of the Wisting Oil Field Offshore Norway

Ettayebi

Wang

Landrø

2023

Sensors

View full text Add to dashboard Cite

The marine controlled-source electromagnetic (CSEM) method has been used in different applications, such as oil and gas reservoir exploration, groundwater investigation, seawater intrusion studies and deep-sea mineral exploration. Recently, the utilization of the marine CSEM method has shifted from petroleum exploration to active monitoring due to increased environmental concerns related to hydrocarbon production. In this study, we utilize the various dynamic reservoir properties available through reservoir simulation of the Wisting field in the Norwegian part of the Barents Sea. In detail, we first developed geologically consistent rock physics models corresponding to reservoirs at different production phases, and then transformed them into resistivity models. The constructed resistivity models pertaining to different production phases can be used as input models for a finite difference time domain (FDTD) forward modeling workflow to simulate EM responses. This synthetic CSEM data can be studied and analyzed in the light of production-induced changes in the reservoir at different production phases. Our results demonstrate the ability of CSEM data to detect and capture production-induced changes in the fluid content of a producing hydrocarbon reservoir. The anomalous CSEM responses correlating to the reservoir resistivity change increase with the advance of the production phase, and a similar result is shown in anomalous transverse resistance (ATR) maps derived from the constructed resistivity models. Moreover, the responses at 30 Hz with a 3000 m offset resulted in the most pronounced anomalies at the Wisting reservoir. Hence, the method can effectively be used for production-monitoring purposes.

show abstract

“…Price et al (2010) show an example from the Frigg field offshore Norway with strong signal interference due to pipelines. However, the conclusion is that even after muting the pipeline affected data, there was sufficient spatial sampling to measure the hydrocarbon potential in the structure.…”

Section: Data Descriptionmentioning

confidence: 98%

CSEM in Proximity of Subsea Infrastructure - A Reservoir Sensitivity Study

Pedersen

Birkeland

2015

Day 1 Tue, October 27, 2015

View full text Add to dashboard Cite

In mature hydrocarbon basins the seabed might have extensive subsea infrastructure and Hite et al. (2015) describe how a Controlled Source ElectroMagnetic (CSEM) survey was designed to follow strict safety requirements around the Perdido installation in the Gulf of Mexico. The imaging results presented are reconstructing the known Frio pay zone and in this paper we conduct a generic synthetic study to look at the degree of reservoir sensitivity loss where obstructions prohibit optimal hardware positioning and demonstrate why exclusion zones is not detrimental to reservoir illumination.

show abstract

3D CSEM over Frigg ‐ dealing with cultural noise

Cited by 11 publications

References 3 publications

The marine controlled source electromagnetic response of a steel borehole casing: applications for the NEPTUNE Canada gas hydrate observatory

The marine controlled source electromagnetic response of a steel borehole casing: applications for the NEPTUNE Canada gas hydrate observatory

Time-Lapse 3D CSEM for Reservoir Monitoring Based on Rock Physics Simulation of the Wisting Oil Field Offshore Norway

CSEM in Proximity of Subsea Infrastructure - A Reservoir Sensitivity Study

Contact Info

Product

Resources

About