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Seismic Data Processing

♦ Onshore/Offshore Processing 2D/3D/4D

Application-specific seismic data conditioning and processing for confident imaging:
From the field to the final volume, seismic data goes through many processes and workflows. Data conditioning encompasses a wide range of technologies designed to address numerous challenges in the processing sequence—from data calibration and regularization to noise and multiple attenuation and signal enhancement.
Each prestack process and subsequent imaging algorithm must be carefully selected to match your goals and expertly applied.
Each step will affect the fidelity of the final images and, ultimately, your confidence in the results.
Whether you have 2D or 3D data, our algorithms can extend the usable bandwidth of both legacy and new seismic datasets. This applies to data of any marine acquisition type or technique, including ocean bottom seismic (OBS), multicomponent, and over-under surveys.
Our research and development professionals are continually developing new technology and workflows for seismic imaging, as well as enhancing existing ones.
We have the technology, expertise and resources to exceed the highest geophysical processing objectives powered by our proprietary Imaging software.
Onshore Processing 2D/3D/4D
Land seismic data processing techniques are divided into two distinct approaches, stratigraphic and structural, and require varying techniques and experience in order to reach the ultimate goal of creating the best image possible. Absolute Imaging specializes in AVO processing and has written proprietary algorithms to ensure data is amplitude friendly for additional inversion and reservoir characterization work
Offshore Processing 2D/3D/4D
We have advanced marine processing tools and the expertise to deal with the complex marine imaging environment, which ranges from shallow to deep waters.
This includes our ability to match the phase, amplitude and static of various acquisition regimes, including Transition Zones (TZ).
To tackle different types of multiples we have developed advanced multiple suppression technologies including MWD, SRME, IME and HRRT.
We also have a variety of noise suppression techniques available to deal with linear, swell, erratic and random noise.
To broaden the bandwidth and enhance the interpretability, we have implemented our proprietary shot and receiver de-ghosting techniques in our marine processing.
To aid in proper imaging of the geologic target in either Time or Depth, we have accurate Velocity Analysis and advanced APSTM and APSDM imaging technologies with various migrators such as Kirchhoff, Advanced BEAM, WEM & RTM.
All of the above technologies are available for towed streamer and OBN/OBC data.
Multicomponent Processing
Unconventional tools and a careful, thoughtful approach to processing are needed to successfully produce interpretable multi-component products. Absolute Imaging has developed the specialized algorithms and expertise to effectively process these unique datasets.
♦ Polarization filtering, and other specialized pre-stack noise suppression techniques
♦ Field orientation analysis and vertical orientation rotation.
♦ Horizontal rotation to radial/transverse or P-S1/P-S2 orientation.
♦ Solving the shear wave receiver statics problem.
♦ Multicomponent moveout – Slotboom NMO.
♦ A layer stripping approach to shear-wave splitting estimation and compensation.
♦ Common Conversion Point (CCP) binning.
♦ Multicomponent post and pre-stack time migration.
Field Development & Production Optimization Services
Static Model Building:
Gas Subsea’s specialist geomodelling department is supported by world-class seismic, sedimentological, stratigraphic, GIS mapping, petrophysical and reservoir engineering personnel. The geological model is the place where all these data are integrated and made sense of.
We focus on providing clients with the big picture based on quality inputs, while all the time keeping a strong focus on their ultimate aims.
Our geological models are used as the basis for dynamic reservoir simulations and fully independent FDPs (field development plans) and advice. Our experienced economics department can advise on FDP optimization, asset value and financial risk.
The main components of our static model building workflow and methodology are:
♦ Data loading, expert QC, and analysis.
♦Integration of regional, sedimentological, diagenetic, petrophysical and reservoir architectural understanding.
♦Incorporation of sedimentological, seismic, petrophysical and reservoir engineering data.
♦ Structural modeling.
♦ Facies and reservoir property modeling.
♦ Saturation modeling and QC.
♦Volumetric determinations and uncertainty analysis.
♦Migration-to-reservoir simulator and initialization support.
Classical Reservoir Engineering
Gas Subsea’s Reservoir Sciences group is well versed with use of analytical reservoir engineering techniques and puts special emphasis on harnessing the results from analytical methods with static and dynamic modeling workflows. Our experts utilize industry-accepted software and in-house analytical tools to conduct their analyses. At GAS Subsea, we appreciate that each reservoir has unique issues, so our experts use tailored workflows to address these and meet our clients’ needs.
Dynamic Modeling:
Gas Subsea has the capability to simulate very large, high-resolution dynamic models with fine grids utilizing workflows tailored for assets at different stages of the E&P life cycle. Our experts use the industry-standard commercial simulation platforms and have global experience in dynamic modeling of complex carbonate and clastic reservoirs with a variety of reservoir fluids. They can recommend optimized field development plans under primary, secondary, and tertiary recovery schemes. Gas Subsea also utilizes a new proprietary ensemble-based history-matching workflow to condition static models to production data so that they are more detailed and realistic, and to refine history-matching results.
Surface Modeling & Economics
Once the dynamic reservoir properties have been generated, Gas Subsea can now conduct well- and field-level optimization studies to help clients select the best interface between reservoir and surface facility. Key components of this solution will be:
♦ Completion design.
♦ Artificial lift design and optimization.
♦ Flow assurance.
♦ Metallurgy selection.
♦ Corrosion assessment.
♦ Well performance (vertical lift curves).
♦ Production system flow.
♦ Pipeline geometry.
♦ Separator pressures.
♦ System constraints and GAP analysis.
After the production forecasts have been generated, cost profiles are created for operating costs (OPEX) and capital costs (CAPEX) as well as abandonment costs. The project can be optimized for the commercial terms and product prices:
♦ Modeling of fiscal terms and the creation of an economics model.
♦ Economics model outputs will be cash flow, NPV, rate of return,
EMVs (for exploration and prospects) and other metrics as required.
♦ Analysis of the economics model outputs to select the optimum development scenario.
Assessing mechanical properties
Surface Modeling & Economics
Get greater insight into the key role of geomechanical effects across the development and production cycle. Coupled reservoir-geomechanical simulation and specialist studies include:

♦Wellbore and casing integrity analysis.
♦ 1D and 3D Pore Pressure Prediction (PPP) and Mechanical Earth Model (MEM) studies.
♦Full field compaction/subsidence and heavy modeling.
♦Waterflood, PWRI, CRI EOR and waste injection modeling.
Fault reactivation modeling.
♦Sand production and cavity propagation modeling.
♦Numerical and analytical PTA/RTA and mini-frac analysis.

Applications for specific scenarios include:

♦ Thermal projects from heavy oil SAGD production to CCS injection.
♦Tar sand heavy oil surface heave, caprock integrity and MOP.
♦ Injection into soft/unconsolidated reservoirs.
♦Naturally fractured reservoir development.
♦ Shale plays and tight formation well completion, stimulation and interference.
♦ Geothermal resource development.
♦ CCS injection and storage.
♦Integration of multi-disciplinary data, including reservoir simulation, 4D seismic, seismic attribute extractions, structure model, and production data.
Geoscience digitalization Services
GAS Subsea has expertise in migrating multi-discipline data from third-party databases into a common platform which can be accessed by other technical consultants. This is important if project data is locked away in inaccessible third-party databases. By accessing and bringing datasets together, a wide range of experts can become aware of all data held for a project from a range of disciplines. This has the key benefit of promoting inter-disciplinary collaboration and an overview of data for more informed decision-making and project management.
Data Management Services:
♦ Inter-disciplinary data awareness.
♦ Migrate inaccessible data.
♦ Promote Inter-Discipline Collaboration.
♦ Improve complex problem-solving.
♦Hold multi-discipline data set in one ♦ accessible platform.
♦ Improve Decision making and planning.
♦ Expand expert input into problem solving.
Seismic Data Vectorization:
Seismic vectorizing quality varies widely across the industry. Although some vectorized SEG-Y files may initially appear acceptable, they will often be missing much of the underlying data. Gas Subsea’s SEG-Y output derives from newly developed vectorizing software with several new techniques.
♦ We use image editing software specifically designed for large images and can consolidate multiple seismic images into one section.
♦Image markings or hand-drawn interpretation are edited out before capturing the underlying seismic.
♦ Shot point and CMP data is recorded.
♦ Extra EBCDIC information is typed from the label (if it exists).
♦ Our software predicts the invisible positive overlap of the peaks and tracks the negative trough wiggle lines.
♦Each trace is bandpass filtered (outside the original frequency range) and amplitude balanced across the whole trace.
♦ Navigation information can be added to the SEG-Y files for easier loading.
Seismic Displays:
♦ Most colour sections can be accurately digitized to SEG-Y. Common examples of this display type include greyscale, black-red and blue-red.
♦Gas Subsea offers high quality seismic reconstruction to SEG-Y from most image sources: photographs, desktop A4 scanned images, computer screen-captured images, data room images, CGM, JPEG, PNG image files etc., all the way up to high resolution large scale seismic hardcopy or plots. Seismic type displays such as Vertical Seismic Profiles (VSPs), EPC and ocean bottom surveys can also be digitized.
Interpretation Removal:
♦An extensively interpreted seismic image converted to SEGY using our Fill Interpolation Filter.
♦ Interpretation normally persists in screenshot image capture, but with Fill Interpolation we can remove it from the SEGY.
Image Recovery:
Most clean-up work is included within the seismic vectorization process. However, in some cases seismic sections may be extensively marked or have significant drawing interpretation over them. If that is the case, extra time may be required to clean these images before digitizing.

The final seismic reconstruction is promptly returned inside oil and gas industry.

standard SEG-Y format files, accompanied with a comprehensive report spreadsheet.
Seismic Displays:
♦ Most colour sections can be accurately digitized to SEG-Y. Common examples of this display type include greyscale, black-red and blue-red.
♦Gas Subsea offers high quality seismic reconstruction to SEG-Y from most image sources: photographs, desktop A4 scanned images, computer screen-captured images, data room images, CGM, JPEG, PNG image files etc., all the way up to high resolution large scale seismic hardcopy or plots. Seismic type displays such as Vertical Seismic Profiles (VSPs), EPC and ocean bottom surveys can also be digitized.
Map Digitizing:
Should digital navigation data not already exist, it can be captured from base-map images. We use a leading map digitizing package which enables us to capture this information and convert it between all common projection systems. Shot-points, wells, contours, boundaries, and faults etc. can all be captured. Similarly, we can capture elevation information from seismic sections and load it into the vectorized SEG-Y trace headers.
Wellsite Services
Advanced expertise available at the wellsite
Real-time wellsite support for geosteering, geostopping and geomapping-while-drilling. We support the life cycle of your drilling project with:

♦Highly experienced wellsite technicians, biostratigraphers and sedimentologists.
♦Logistics and planning for mobile wellsite onshore/offshore laboratories and equipment.
♦Post-drill integrated expertise from finite-scale scanning electron microscopy to basin-scale regional seismic evaluation.

Supported by our leading thin section ﹠ microscopy laboratories, our multi-disciplinary laboratory teams take the laboratory to wellsite, supporting geoscientists with integrated, tailored techniques:

♦ Wellsite biostratigraphy.
♦ Wellsite micropaleontology.
♦Injection into soft/unconsolidated reservoirs.
♦ Wellsite nannopaleontology.
♦ Wellsite palynology (acid ﹠ enhanced non-acid).
♦ Wellsite reservoir petrography.
♦ Wellsite lithostratigraphy.
♦ Wellsite elemental chemostratigraphy (XRF)