1887
  1. Home
  2. Conferences
  3. Conference Proceedings
  4. 3rd EAGE/SPE Geosteering Workshop
  5. Conference paper

Abstract

Summary

Angular unconformity of bed boundaries and the oil-water contact is common for the Troll field in Norway. The depth of investigation and azimuthal sensitivity of extra-deep azimuthal resistivity (EDAR) measurements make it possible to image such complex structures. The paper describes an approach to real-time 2D inversion based on artificial neural networks (ANNs). We propose a 2D parametric model with two non -parallel boundaries suitable for scenarios with angular unconformity and pinch-out. The 2D inversion algorithm utilizes the Levenberg-Marquardt optimization method and the ANN-based solver. Training of the ANNs for the parametric model is performed using a synthetic database containing samples with the model parameters and corresponding tool responses. The inversion is performed interval by interval first with the 1D layer-cake model. If any “non-1D” behavior is observed in the data or the resulting picture, then we switch to the 2D model. On the example of one of the wells in the Troll field, we demonstrate that the described approach reconstructs the oil-water contact and the unconformable boundary with the performance fast enough for real-time.

© EAGE Publications BV
Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.2021624019
2021-11-02
2024-04-20

  • From This Site

    /content/papers/10.3997/2214-4609.2021624019
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Astrakova, A.S., Kushnir, D.Yu., Velker, N.N., et al.
    2020. 2D Electromagnetic Inversion using ANN Solver for Three-Layer Model with Wall: Interekspo GEO-Sibir’. Russia, Novosibirsk, April20–24. DOI: 10.18303/B978‑5‑4262‑0102‑6‑2020‑031.
     https://doi.org/10.18303/B978-5-4262-0102-6-2020-031 [Google Scholar]
  2. Dupuis, C., Omeragic, D., Chen, Y.-H., et al.
    2013. Workflow to image unconformities with deep electromagnetic LWD measurements enables well placement in complex scenarios: SPE Annual Technical Conference and Exhibition. SPE-166117-MS. New Orleans, Lousiana, September 30 – October 2. DOI: 10.2118/166117‑MS.
     https://doi.org/10.2118/166117-MS [Google Scholar]
  3. Dyatlov, G., Onegova, E., and Dashevsky, Yu.
    2015. Efficient 2.5D electromagnetic modeling using boundary integral equations. Geophysics80 (3), 163–173, DOI: 10.1190/geo2014‑0237.1.
     https://doi.org/10.1190/geo2014-0237.1 [Google Scholar]
  4. Dyatlov, G., Kushnir, D., and Dashevsky, Yu.
    2017. Treatment of singularity in the method of boundary integral equations for 2.5D electromagnetic modeling. Geophysics82 (2), 57–75. DOI: 10.1190/geo2015‑0645.1.
     https://doi.org/10.1190/geo2015-0645.1 [Google Scholar]
  5. Hartmann, A., Vianna, A., Maurer, H. M., et al.
    2014. Verification testing of a new extra-deep azimuthal resistivity measurements. SPWLA 55th Annual Logging Symposium, Abu Dhabi, United Arab Emirates. May 18–22.
     [Google Scholar]
  6. Kushnir, D., Velker, N., BondarenkoA., et al.
    2018. Real-Time Simulation of Deep Azimuthal Resistivity Tool in 2D Fault Model Using Neural Networks. Society of Petroleum Engineers, p. 1–11. SPE-192573-MS. DOI: 10.2118/192573‑MS.
     https://doi.org/10.2118/192573-MS [Google Scholar]
  7. Sviridov, M., Mosin, A., Antonov, Yu., et al.
    2014. New Software for Processing of LWD Extradeep Resistivity and Azimuthal Resistivity Data. SPE Reservoir Evaluation & Engineering17, 109–127. DOI: 10.2118/160257‑PA.
     https://doi.org/10.2118/160257-PA [Google Scholar]
  8. Tilsley-Baker, R. M., Antonov, Yu., Martakov, S., et al.
    2016. Extradeep-Resistivity Application in Brazil Geosteering Operations Enables Successful Well Landing. SPE Reservoir Evaluation & Engineering19 (01), 108–115. DOI: 10.2118/166309‑PA.
     https://doi.org/10.2118/166309-PA [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.2021624019
Loading
2D Inversion for Structure with Angular Unconformity on Example of Troll Field
Conference Proceedings 2021, 1 (2021); https://doi.org/10.3997/2214-4609.2021624019
/content/papers/10.3997/2214-4609.2021624019
/content/papers/10.3997/2214-4609.2021624019
Loading

Data & Media loading...

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error