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Schoepp A.,Royal Dutch Shell | Landa E.,Geomage | Labonte S.,Royal Dutch Shell
Society of Petroleum Engineers - SPE/AAPG/SEG Unconventional Resources Technology Conference | Year: 2016

Unconventional reservoirs have a unique set of problems. Most production wells are drilled horizontally through the reservoir rock and hydraulic fracturing is applied to increase permeability in the reservoir. The pre-drilling knowledge of natural fracture corridors and small offset faults is very important in this case. Seismic resolution from conventional reflection imaging is generally not sufficient to resolve such small scale rock properties. Diffracted waves are events generated by small scale subsurface heterogeneities and discontinuities (including fractures). Detection and imaging the diffractive component of the total wavefield opens a new perspective to find and characterize fracture zones in carbonate environment. Copyright 2014, Unconventional Resources Technology Conference (URTeC). Source

Kuznetsova O.,PetroTraceServices | Karaulov A.V.,Geomage
New Geotechnology for the Old Oil Provinces | Year: 2013

A great part of global oil reserves (up to 25-50%) is concentrated in vuggy-fractured reservoirs. Thus, planning of such reservoir development requires an accurate identification of the respective areas, i.e. fractured zones. Traditional seismic images in such conditions are generally not effective, since they show the energy from strong reflectors, while cracks and vugs do not create regular reflections - they cause the appearance of diffraction component. On the other hand, a diffraction component of the wave field is a direct indicator to the presence of small-scale components in the media, including fractured rocks. The paper reviews theoretical aspects of new technique, developed by Geomage - Diffraction Multifocusing, designed for identification and analysis of vuggy-fractured reservoirs. Examples from the Western Siberia fields demonstrate the results of the Diffraction Multifocusing application for searching the fracture / high-permeability zones in the Bazhenov Formation. We show that the increase in the "diffraction image" readings - fracturing parameter - facies variability is associated with fault zones. The paper points to the probability of higher flow rates in the wells, located in areas with high diffraction readings. Source

Goussev S.,Exploration Consultant | Rauch-Davies M.,Geomage | Smith P.A.,Addax Petroleum | Weber J.,CGG GravMag Solutions
Leading Edge | Year: 2014

We present a concept and methodology for the prediction of deep stratigraphic targets of the incised-valley trap type from the prospect-scale integrated interpretation of the gravity, magnetic, seismic, and well data. The key components in this concept are the "reference" stratigraphie target, identified and delineated on 2D seismic sections, and the "tuning" filter designed from the target's spatial dimensions. The tuning-filter-derived residual gravity anomalies are evaluated and sorted out to keep those that have the highest probability of being associated with sand accumulations of the incised-valley type. The concept and methodology of its application are illustrated with an example of the case study in the East Texas/North Louisiana sedimentary basin. Source

Berkovitch A.,Geomage | Deev K.,Geomage | Landa E.,OPERA
First Break | Year: 2011

MultiFocusing technology can dramatically improve the quality of seismic imaging especially in cases of low fold data, poor signal-to-noise ratio and sparse 3D acquisition. MF technology, based on multiparameter analysis of the wavefield and summation along predicted time surfaces, has been applied to enhance time imaging sections by dramatically increasing the fold of coherent summation of seismic signals. One of the main limitations of the zero-offset MF method is a quasi-hyperbolic approximation for actual travel-time surfaces. COMF traveltime formulas provide an adequate representation of arrival times for arbitrary offset and source-receiver configuration. The COMF correction formula is remarkably accurate even for strong curved reflectors. The correlation procedure is repeated for each imaging point, for each offset and for each time sample. It is important to note that the described procedure can be applied locally within a small vicinity of each seismic trace and does not require global full offset approximation. Source

Elhaj N.,Breitburn | Rutherford S.,Breitburn | Gish D.,Breitburn | Rauch-Davies M.,Geomage Ltd | And 2 more authors.
76th EAGE Conference and Exhibition 2014, Workshops | Year: 2014

Acquiring seismic 3D data in highly populated areas is very difficult. The design of such surveys is usually highly irregular and the processing of these data challenging. The MultiFocusing (MF) imaging technology, which belongs to the group of multi-parameter processing (MPP) methods, does not require a regular acquisition design and is especially suitable for such scenarios. We will illustrate this imaging technology and show MF data regularization results utilizing an irregular 3D dataset acquired in a populated area in the United States. A 3D dataset that was acquired with a highly irregular design over a densely populated area was processed with a conventional processing sequence and with the multi-dimensional MF methodology. The MF data regularization was crucial for this dataset for subsequent prestack time and depth imagining. The first MF dataset had a 110ft x 110ft binning. Further testing showed that a binning of 55ft x 55ft produced the best results for horizon mapping and was used for the final PSTM delivery. For additional attribute work, the 110ft x 110ft binning was more suitable asit showed a higher frequency content. Source

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