Tetrale Technologies Inc.

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Tetrale Technologies Inc.

Canada
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Dubrova G.B.,Ukrainian State Geological Research Institute | Khromova I.,Lukoil | Kostyukevych A.,Tetrale Technologies Inc. | Luo D.,China National Offshore Oil Corporation | And 2 more authors.
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

Modification of the application methods for duplex wave migration (DWM) has enabled us to obtain seismic images of sub-vertical boundaries which are formed by the waves having the fixed incidence angle ranges (partial DWM cubes). It allows the AVO analysis for sub-vertical objects (AVO-DWM) and on that basis the classification of the vertical boundaries and their properties. The role of the full-wave modeling for calculation of corrections needed for the creation of amplitude corrected AVO-DWM curves on vertical boundaries is shown. Example of the AVO - DWM on a real 3D data set is demonstrated.


Marmalevskyi N.,Ukrainian State Geological Prospecting Institute | Roganov Y.,Ukrainian State Geological Prospecting Institute | Gornyak Z.,Ukrainian State Geological Prospecting Institute | Kostyukevych A.,Tetrale Technologies Inc. | And 2 more authors.
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

With synthetic examples, a method for evaluating vertical velocity and Thomsen's anisotropic parameters and in isotropic and vertical transverse isotropic (VTI) media is demonstrated. The method uses duplex wave migration (DWM) as the engine that determines these parameters. One of the characteristics of DWM based velocity analysis is that it's resolving power increases (rather than decreases) with depth. With DWM, seismic images of vertical boundaries in a narrow range of transformation apertures are formed. It allows group velocities in VTI media to be determined with a rather high accuracy. With these velocities, Thomsen parameters and vertical velocities are evaluated. The area in which the above parameters are determined is much smaller than for conventional PSDM based velocity analysis using sub-horizontal boundaries. Therefore, this method enables improved resolution of local lateral changes in anisotropic velocity parameters. © 2010, European Association of Geoscientists and Engineers.


Khromova I.U.,Lukoil | Iakovlev A.,LARGEO LLC | Link B.H.,Tetrale Technologies Inc.
KazGeo 2010 - 1st International Geosciences Conference for Kazakhstan: Where Geoscience Meets the Silk Road | Year: 2010

This paper describes examples of mapping fracture zones in carbonate reservoirs using duplex wave migration (DWM). This method is used following conventional pre-stack depth migration with a new and very different type of pre-stack depth migration called DWM plus interpretation. The theoretical basis of the DWM process enables its ability to provide accurate and detailed detection of the position and properties of vertical boundaries and of the fracture zones confined by them. Fracture zones revealed using the DWM process are compared with available well information that verifies the existence or absence of anomalous permeability, its direction, and most importantly, information about the intensity of open fracturing in productive wells. The locations of open fracturing are verified by the productivity factors and interconnection of these wells. Also, the DWM results are compared with the results of standard methods for seismic data interpretation, which are widely used for mapping of small-scale faults and fracture zones.


Tiapkina O.,Norwegian University of Science and Technology | Landro M.,Norwegian University of Science and Technology | Tyapkin Y.,UkrSGPI | Link B.,Tetrale Technologies Inc.
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

In conventional seismic surveys, ground roll is an unwanted phenomenon constituting a large part of the radiation of seismic sources operating at the surface. Typically, it covers large parts of seismic records, dominating them and, therefore, masking underlying useful reflections. With the appearance of multicomponent geophones, the major efforts to eliminate the ground roll moved from the field operations to the processing stage and were laid on robust up-to-date techniques, polarization filters being the most popular. The objective of the present research efforts is to investigate theoretically and with a rather realistic 2.5D 3C synthetic data set the performance of the single-station SVD-based technique first developed by Jin and Ronen (2005) or, more specifically, to estimate the damage to the underlying reflections that can be caused by the polarization filter when subtracting the ground roll. The results obtained allow us to formulate when the ability of single-station SVD-based polarization filtering to subtract effectively the ground roll may permit the geophysicist to shut his eyes to the inevitable harm that is done by this type of filtering to the underlying reflected waves.


Kromova I.Y.,Lukoil | Link B.H.,Tetrale Technologies Inc. | Marmalevskyi N.,Ukranian State Geological Prospecting Institute
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

Over the last few years Lukoil has published the results of two exhaustive studies into the problem of fracture detection. Fracture prediction methods based on reflection amplitude, reflection curvature and its derivatives, coherency cube, spectral decomposition, ant-tracking technology, azimuthal anisotropy of P-wave velocity, and DWM amplitude cube analysis. We concluded that the DWM technique was the most reliable method for fracture permeability detection (Khromova et al., 2011). Lukoil planned a 2010 drilling program for horizontal wells based on DWM technology and this paper will report on the results of that 2010 drilling program. Two horizontal wells were drilled into a limestone interval and extensive well log measurements were taken. The well results illustrate that the location of the fracture systems as predicted by DWM were accurate to within 25 metres. The DWM amplitude maps and well log results will be shown to illustrate the success of this fracture prediction technique. Also, the ability to use these actual well results, along with full wave forward modelling, and DWM technology to push the boundaries of reservoir characterization prediction using an integrated seismic-based methodology is investigated.


Khromova I.U.,Lukoil | Link B.H.,Tetrale Technologies Inc.
72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010 | Year: 2010

This paper describes examples of mapping fracture zones in carbonate reservoirs using duplex wave migration (DWM). This method is used following conventional pre-stack depth migration with a new and very different type of pre-stack depth migration called DWM plus interpretation. The theoretical basis of the DWM process enables its ability to provide accurate and detailed detection of the position and properties of vertical boundaries and of the fracture zones confined by them. Fracture zones revealed using the DWM process are compared with available well information that verifies the existence or absence of anomalous permeability, its direction, and most importantly, information about the intensity of open fracturing in productive wells. The locations of open fracturing are verified by the productivity factors and interconnection of these wells. Also, the DWM results are compared with the results of standard methods for seismic data interpretation, which are widely used for mapping of small-scale faults and fracture zones. © 2010, European Association of Geoscientists and Engineers.

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