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While working with the complex datasets generated by modern seismic surveys it became obvious that a more structured way of storing and presenting the attributes generated and collected during a survey was required. Our solution is to provide tools to export the required attributes into an “Attribute Database” in a numerical form.

Using these tools we have the ability to provide position, performance or seismic attribute data for each shot of a survey in a structured ASCII format based on UKOOA P1/90. MultiStudio is complete with software tools for visualising the attribute data and for the configuration of output file structure for importation into any GIS or other external visualisation package.

These services and tools can also be provided on historical surveys. In these cases we would take legacy P2/94 and or P1/90 and construct a MultiStudio database in house; using this database we can create a webQC site which visualises the data and provides the attribute data itself for download via our secure web portal.

With more and more 4D being acquired these tools become pertinent to the planning of 4D projects, particularly where a monitor survey is to be acquired over a baseline which was shot with 3D techniques (steering for coverage). As the MultiStudio QC Suite maintains a comprehensive attribute database throughout a survey, it is possible to provide survey-wide visualisation between sequences.

Attribute Analysis Examples

Bathymetry
The data can be taken from any of the echo-sounders on board the recording vessel(s) or from the processed data such as P1/90 comparisons between the raw and processed data can be made to ensure any corrections have been applied satisfactorily.

Spatial Plots
Any attribute in the MultiStudio database can be examined as a spatial distribution plot. Our GIS routines have been developed in house and it is possible to link the display to other useful information from the acquisition, e.g. QC reports, weather or 4D related information. Software whose GIS plots use third party tools such as ArcGIS do not have the versatility of MultiStudio and cannot be specifically tuned to field QC of seismic acquisition. Most of these are more appropriate to post survey investigations rather than dedicated field QC. MultiStudio has a configurable palette which can be tailored to the requirements of specific attribute data, plots can also be configured to display the percentage of samples which fall into the value range of each palette colour band.

Tides, Currents and Streamer Feather Prediction module
MultiStudio includes tools for monitoring tides and predicting streamer feather behaviour. Plots are available for the streamer feather for each acquired sequence. A curve for each line is drawn with y-value being feather, and the x-value is in time relative to high water at a chosen port (almanac data). In survey areas with strong tidal patterns this tool is very useful for minimising infill by matching streamer feathers between acquired sequences. As part of these tools streamer feather behaviour can also be displayed against the day and time. This type of display can be useful when there are tidal influences but they vary in strength and direction over periods of days. MultiStudio can also provide plots for theoretical cross-line direction tidal component, which is created by investigating current vector data from tidal diamonds on Admiralty charts. The software allows for altering the line direction to observe what effect this has on the theoretical streamer feather.

ShotPLOT
MultiStudio also has tools for visualising data such as streamer channel noise, streamer depths, bird-fin angles as a grid-style with the x-axis in shotpoints and the y-axis in channel number or bird number.