GEOPHYSICAL DATA SERVICES
OvationData works with significant volumes of geophysical data, enriching the value of datasets for clients in the exploration industry.
Our geophysical data services improve workflows, so your geosciences team can focus on analysis and discovery instead of data management.
Quality assurance and data validation are key procedural elements that ensure accurate metadata and data integrity. Our geophysical specialists provide domain-specific attention to detail.
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Vector data is represented as points and lines that are geometrically and mathematically associated.
Points are stored using the point coordinates. For example, a two-dimensional point is stored as (x,y).
Lines are stored as a series of point pairs such as (x1,y1) and (x2,y2). Point pairs represent the start and end point of a line segment.
We are experienced with vectorising shot point maps, cartographic data and satellite images. Our processes include correcting existing map data. We provide output in standard ASCII, ARC shape and p/190 files (shot point maps).
Vectorising well logs
We use our Diplomat Wellman software to perform data vectorising on the digital images of well logs. With our technical knowledge of well log data, we offer manual curve tracking to supplement our software's automatic curve tracking for difficult logs. Advanced image manipulation routines ensure that the image is optimised for the tracking algorithms. The vectorising process includes the ability to depth match curves, de-spike sonic curves, splice curves to produce a composite log and other curve manipulation functions.
Our well log services include vectorising dipmeter (tadpole) data, formation tops and lithology columns.
Vectorising seismic sections
Vectorising seismic sections
Vectorising seismic sections reconstruct the SEGY information suitably for re-processing and loading to interpretation workstations for re-evaluation using modern techniques. Ancillary data such as location information, velocity tables, field statics and elevations can all be incorporated to produce a complete data set.
Our vectorising processes include:
- Automatic vectorising of seismic traces with options for peak tracking with clipped peak interpolation and trough tracking (full waveform vectorising)
- Interpolation of trough values if no troughs are displayed
- Optional trace reconstruction for poor quality displays
- Basic processing including filtering, mute, automatic gain control (AGC), trace mixing and trace interpolation
- SEGY file editing including full control over EBCDIC header contents, and inserting shot point and common midpoint (CMP) numbers
- Output vectorised data to disk in SEGY format
- Curve capture - vectorise elevations or field statics from seismic scans
- Velocity tables - capture the stacking velocities from the seismic scans
- Location data - geo-reference or digitise seismic shot point maps and output to UKOOA
- Re-projection of seismic location data to a specified coordinate system
- Insert the XY coordinates into the seismic trace headers
- Data delivery through file transfer protocol (ftp), DVD/CD-ROM or tape
During navigation merge, we generate near-trace SEG-Y files for our technicians to complete thorough quality control checks. For additional quality control procedures and database activities, we create a CSV file with attributes from each source and streamer combination including the shotpoint number, shotpoint time, source ID, streamer ID, first arrival time, water depth and other relevant attributes.
As part of our extensive quality control procedures, we:
- Compare the navigation data from the shotpoint location maps with the merged SEGY data
- Analyse the water depth distribution chart for accuracy
- Compare the data shot time with the navigation shot time
- Evaluate the picked first arrival time with the expected direct arrival time for each streamer
- Compare the fold of coverage map from the navigation data with the merged SEG-Y data
- Evaluate the seismic trace in subsurface track order with the picked and expected arrival times
- Provide a statistical analysis of the attribute file
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