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Manifestation of Fluid Saturation in Scattererd Waves – Numerical Experiments and Field Study

Manifestation of Fluid Saturation in Scattererd Waves – Numerical Experiments and Field Study. Vladimir A. Tcheverda 1 , Vadim V. Lisitsa 1 , Galina V. Reshetova 1 . Anastaiya S. Merzlikina 2 , Valery V. Shilikov 2 . Vladimir A. Pozdnyakov 3.

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Manifestation of Fluid Saturation in Scattererd Waves – Numerical Experiments and Field Study

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  1. Manifestation of Fluid Saturation in Scattererd Waves – Numerical Experiments and Field Study II Russian-French Workshop "Computational Geophysics"

  2. Vladimir A. Tcheverda1, Vadim V. Lisitsa1, Galina V. Reshetova1. Anastaiya S. Merzlikina 2, Valery V. Shilikov2. Vladimir A. Pozdnyakov3. 1 – Institute of petroleum Geology and Geophysics SB RAS, Novosibirsk 2 – Rosneft Krasnoyarsk 3 – Siberian Federal University, Russia II Russian-French Workshop "Computational Geophysics"

  3. This study is done thanks to PRACE* Access Grant # 2012071274: 32 million core-hours on supercomputer HERMIT at Stuttgart University Acknowledgements: * Partnership for Advanced Computing in Europe II Russian-French Workshop "Computational Geophysics"

  4. Content Carbonate reservoirs. Fracture corridors. Scattered waves. Scattered waves’ simulation II Russian-French Workshop "Computational Geophysics"

  5. Content Carbonate reservoirs. Fracture corridors. Scattered waves. Scattered waves’ simulation II Russian-French Workshop "Computational Geophysics"

  6. Oil in carbonate reservoirs “It is estimated that more than 60% of the world's oil and 40% of the world's gas reserves are held in carbonate reservoirs.” (http://www.slb.com/services/technical_challenges/carbonates.aspx) II Russian-French Workshop "Computational Geophysics"

  7. Oil in carbonate reservoirs II Russian-French Workshop "Computational Geophysics"

  8. Oil in carbonate reservoirs II Russian-French Workshop "Computational Geophysics"

  9. Acquisitions and deep wells II Russian-French Workshop "Computational Geophysics"

  10. Cavernous/fractured reservoirs Common situation for reservoirs in the carbonate environment: oil is accumulated in caverns, but permeability is determined mainly by fractures. Rock matrix is not permeable. II Russian-French Workshop "Computational Geophysics"

  11. Core samples from Yurubcheno-Tohomskoe oil field No cavities With cavities II Russian-French Workshop "Computational Geophysics"

  12. Variety of fractures in the carbonate environment (following J.-P.Petit et al.) FC – fracture corridors BFC – bed controlled fracture MBF – multibed fractures HPF – highly persistent fractures II Russian-French Workshop "Computational Geophysics"

  13. Fracture corridors Recovery of fracture corridors is of great importance in order to ensure effective oil field development. II Russian-French Workshop "Computational Geophysics"

  14. Uncovered (outcrop) fracture corridor II Russian-French Workshop "Computational Geophysics"

  15. Content Carbonate reservoirs. Fracture corridors. Scattered waves. Scattered waves’ simulation. II Russian-French Workshop "Computational Geophysics"

  16. Scattered waves Regular seismic technology based on reflected waves cannot reconstruct the fine structure of a fractured reservoir: resolution of standard seismic techniques is of a few meters at best, while the typical thickness of fracture corridors does not exceed a few tens of centimeters. Fortunately, these objects generate scattered waves which can deliver important knowledge about fine interior of hydrocarbon collectors. II Russian-French Workshop "Computational Geophysics"

  17. Scattered waves and fracture orientation II Russian-French Workshop "Computational Geophysics"

  18. Model (thanks to Pierre Thore) II Russian-French Workshop "Computational Geophysics"

  19. Closer look, top II Russian-French Workshop "Computational Geophysics"

  20. Closer look, x-line II Russian-French Workshop "Computational Geophysics"

  21. Closer look, in-line II Russian-French Workshop "Computational Geophysics"

  22. Wavefield inside the reservoir, top view II Russian-French Workshop "Computational Geophysics"

  23. Wavefield inside the reservoir, top view. P-wave scattering II Russian-French Workshop "Computational Geophysics"

  24. Wavefield inside the reservoir, top view. S-wave scattering II Russian-French Workshop "Computational Geophysics"

  25. Wavefield, x-line view II Russian-French Workshop "Computational Geophysics"

  26. Wavefield, x-line view II Russian-French Workshop "Computational Geophysics"

  27. Wavefield, in-line view II Russian-French Workshop "Computational Geophysics"

  28. Cross-line In-line II Russian-French Workshop "Computational Geophysics"

  29. Azimuth distribution of scattering energy II Russian-French Workshop "Computational Geophysics"

  30. Azimuth distribution of scattering energy and fracture orientation: Real data Azimuth distribution of scattered energy Distribution of fractures in the well by FMI (Formation MicroImager) scanner II Russian-French Workshop "Computational Geophysics"

  31. Scattered waves and fluid saturation II Russian-French Workshop "Computational Geophysics"

  32. Real life cubes Seismic cubes Permeability II Russian-French Workshop "Computational Geophysics"

  33. Fluid saturation and scattered waves II Russian-French Workshop "Computational Geophysics"

  34. Fluid saturation and scattered waves: synthetic II Russian-French Workshop "Computational Geophysics"

  35. Fluid saturation and scattered waves: real data II Russian-French Workshop "Computational Geophysics"

  36. Fluid saturation and scattered waves: real data II Russian-French Workshop "Computational Geophysics"

  37. Fluid saturation and scattered waves: real life prognostic geological map II Russian-French Workshop "Computational Geophysics"

  38. II Russian-French Workshop "Computational Geophysics"

  39. Fluid saturation and scattered waves Image in scattered waves Multiple scattering Core sample II Russian-French Workshop "Computational Geophysics"

  40. Content Carbonate reservoirs. Fracture corridors. Scattered waves. Scattered waves’ simulation. II Russian-French Workshop "Computational Geophysics"

  41. Scattered waves’ simulation Simulation of wave propagation in realistic 3D anisotropic, viscoelastic media taking into account microstructure (fractures, cracks, caverns etc.) to get a knowledge about scattered energy. How are we doing this? Time domain explicit finite-differences methods with local grid refinement in time and space. II Russian-French Workshop "Computational Geophysics"

  42. First order system of viscoelastic wave equations II Russian-French Workshop "Computational Geophysics"

  43. Artifacts Estimated amplitude ofscattered waves (theory of single scattering)is about 0.001 – 0.01 with respect to the incident one!! Artificial reflections must be around II Russian-French Workshop "Computational Geophysics"

  44. Local grid refinement • Fine grid should be used only where \caverns\cracks\fractures are presented in order to avoid unrealistic demands on computer resources. • Different grids cause artificial reflections due to different numerical dispersion. • These artificial reflections must be around 10-3 - 10-4 with respect to incident wave. • Finite-difference scheme must be stable. II Russian-French Workshop "Computational Geophysics"

  45. Local grid refinement 1. Grid refinement in time and space is performed by turn: II Russian-French Workshop "Computational Geophysics"

  46. Parallel implementation via domain decomposition Fine-grid area can be placed anywhere within the reference model regardless to the specific domain decomposition used in coarse-grid model. II Russian-French Workshop "Computational Geophysics"

  47. Groups of PU: data exchange II Russian-French Workshop "Computational Geophysics"

  48. Scalability Optimal 3D Domain Decomposition via METIS - Serial Graph Partitioning and Fill-reducing Matrix Ordering. Non-blocking send/receive procedures. Computations are starting from the most interior point and are expanding towards neighboring domain Send/Receive of partially sampled data II Russian-French Workshop "Computational Geophysics"

  49. Scalability Strong scalability (acceleration): the size of a problem is fixed, but the number of cores increased. Ideal acceleration: N x time(N) = const, N – number of cores. II Russian-French Workshop "Computational Geophysics"

  50. Strong scalability (acceleration) II Russian-French Workshop "Computational Geophysics"

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