United States
United States

Time filter

Source Type

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.

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.

Landa E.,Advisory Board of Geomage | Rauch-Davies M.,Geomage | Deev K.,Geomage | Berkovitch A.,Geomage
76th EAGE Conference and Exhibition 2014, Workshops | Year: 2014

Imaging in complex areas is of great importance in seismic imaging. First of all it is connected to the ability to extract valuable information from the raw seismic data and to use this information for constructing of a reliable velocity model, which is a crucial step in depth imaging. In such case, time processing is a necessary step to improve signal to noise ratio in the raw data. Moreover, results of time imaging can significantly help to create reliable velocity models and consequent depth images. Improving the quality of prestack data always stays in focus of intensive research. In this paper we follow an approach presented by Berkovich et al. (2011) which proposes using a local COMF approximation for traveltime stacking surface description. It allows for an arbitrary common offset adequately approximate traveltimes of seismic events in the vicinity of a CMP position. The paper presents application of the proposed procedure on synthetic and real data including imaging using the improved seismic data.

Kuznetsova O.,PetroTraceServices | Landa E.,Opera | 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.

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.

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).

Berkovitch A.,Geomage | Deev K.,Geomage | Landa E.,OPERA
Leading Edge | Year: 2012

It is widely considered that, in regions with significant geologic complexity, methods which work directly in the depth domain are superior to methods which operate on prestack time data. So, for example, velocity analysis using depth migration and residual moveout became standard in the industry. The most common depth-velocity analysis attempts to flatten common-image-migrated gathers for main reflectors by measuring depth errors as a function of the offset. At the same time, the fact that most depth-domain algorithms are valid only for correct or nearly correct velocity models should not be underestimated. If this assumption is violated, they can lose their convergence properties or produce wrong results. © 2012 Society of Exploration Geophysicists.

Berkovitch A.,Geomage | Deev K.,Geomage | Pelman D.,Geomage | Rauch-Davies M.,Geomage
74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources | Year: 2012

DEDICATED-Case Studies in Diffraction Imaging and Interpretation. In this paper we present a generalization of MultiFocusing 3D method which adequately describes not only reflection but also diffraction events. Optimal summation of the diffracted events and attenuation of the specular reflections allows creating an image containing mostly diffraction energy. We briefly describe the theory of the multifocusing method and demonstrate the efficiency of the proposed diffraction imaging technique on field data by using it for faults, pinchouts, fractures, karsts detection during interpretation process.

Rauch-Davies M.,Geomage | Pelman D.,Geomage | Deev K.,Geomage
Society of Petroleum Engineers - SPE/AAPG/SEG Unconventional Resources Technology Conference | Year: 2016

Predicting fracture swarms and corridors in unconventional reservoirs is part of the sweet spot mapping workflow. Naturally occurring fracturing can either enhance the hydrocarbon production or diminish the effects of fracking. In any case, it is essential to be able to map them before any drilling decision is made. Commonly, these features are determined through indirect methods such as picking of horizons and faults and inferring areas that are under stress. Post stack attributes such as coherence and curvature are routinely utilized and in general add value to this task. Diffraction imaging is the only direct measurement of small scale discontinuities like fracture swarms and corridors. They are generated whenever the wave encounters an irregularity that's of detectable size and are not restricted to events that exhibit displacement like is needed for coherence or curvature. Diffractions are much weaker than the reflections and are generally lost in the seismic processing. To separate diffractions from reflections is challenging but we like to present the MultiFocusing diffraction imaging technology that is based on a coherent summation of the diffracted waves and suppression of the reflective part. Azimuthal diffraction imaging, which extracts the diffractivity along chosen azimuths adds information of the dominant fracture direction and will be discussed. Copyright 2014, Unconventional Resources Technology Conference (URTeC).

Berkovitch A.,Geomage | Belfer I.,Geomage | Scharff N.,Geomage
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

Diffraction energy is an important part of the total seismic wavefield. It indicates the present of small scale geomogical objects such as faults, karsts, fractures in the subsurface. Multifocusing has a specific feature to adequately charachterize diffraction traveltime surfaces. This feature can be used to detect and to identify duffraction energy in the total wavefield. Diffraction Multifocusing Stack represents an imaging where diffraction events are enhances and specular reflections are attenuated. These type of images can be used for reliable detection and characterization of important subsurface elements.

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