NEW!! IXRefraX GRM Seismic Refraction Software for Windows
Interpex offers five packages that apply to seismic refraction data. FIRSTPIX v4 is a data processing package. GREMIX v2, GREMIX 15, GREMIX S and GREMIX 15 S interpret seismic refraction data. Used together, FIRSTPIX v4 and any GREMIX package provide an integrated software system for editing and interpreting your seismic refraction data.
FIRSTPIX is an interactive, graphically oriented, seismic refraction trace processing, display, and first arrival picking program. The main functions are as follows:
Digitally recorded seismic data are transferred from the input records to an internal database. Up to 20 shots, recorded by as many as 48 geophones per shot, can be used.
Geophones cannot be placed coincident with the shot source locations. You can merge seismic records to create larger spreads from several smaller ones, or to display common offset refraction or reflection data. When merging records, it is assumed that the geophone locations do not overlap, and that the shot locations, the sample rates and trace length are the same for each spread.
You can edit the arrangement of the source and receiver locations (geometry) to depict the actual field data collection parameters. Shot and geophone locations, and uphole times for downhole shots are included.
Geometry as well as shot records can be viewed on screen. Select from several display parameters, including trace scaling, trace clipping, variable area, zoom, and vertical or horizontal display orientation of the shot record. You can pick first breaks automatically or manually to create the travel time curve set for the spread.
Travel time curves are the visual relationship between the spread geometry and the first arrival times picked from the displayed shot records. First arrivals are a function of the survey geometry and the travel time of the seismic waves along the geological refraction interfaces. These travel time curves can be displayed on screen to be checked for relevancy and possible picking or geometry errors.
After the travel time curves appear satisfactory, you can print or plot the data, and produce a plate style plot of the travel time curves.
The following is a list of the features that were added or enhanced from previous FIRSTPIX programs
Picking of first breaks is accomplished via interactive graphical mouse picking in an enlarged windows. The picking window is user definable for both trace length and gain. Record selection can be made directly from picking screen. Travel time curves can be displayed while picking.
Auto picking allows for automatic picking of all records at once or for individual records. Picking can also be done by displaying all relevant travel time curves and selecting a point on a curve. The program then displays a window with five applicable traces from the selected record. Gain and length of these displayed traces are user controllable.
Picking is then done interactively on the displayed traces. Changes to the travel time curves are made in real time. This feature is especially useful to repick traces while taking other records into consideration.
FIRSTPIX now also features combining of records using an interactive analysis window displaying traces from the records to be combined. By changing the combination factor interactively the user can see the combined effect in real time. This feature allows users to do shear wave analysis and picking interactively.
Traces can be displayed with AGC on or off and traces can be filtered with a user selectable low pass filter. Time ranges as well as trace width and overlap can be set for global operation or can be changed for each record.
The program also features all the usual INTERPEX features including screen attribute control, color control over plotting colors, command mode, user definable plot labels and outputs to all popular plotting and printing devices including Laser printers and Postscript files.
GREMIX interprets seismic refraction data. It is a powerful, easy to use tool for interpreting laterally varying layered earth structure as well as for detecting hidden layers. GREMIX lets you enter, edit, interpret and plot seismic refraction first arrival data.
It incorporates the slope-intercept method, parts of the Plus-Minus Method of Hagedoorn (1959), Time-Delay Method, and features the Generalized Reciprocal Method (GRM) of Palmer (1980).
Plate style output of travel time curves with or with out layered earth fits, velocity section, time depth section and annotated interpreted depth section with or without arcs.
Plots will display up to 16 spreads and a maximum of 9 shots on one plot, each with 69 geophones for a maximum of 1104 geophones.
GREMIX S allows for surface topography (elevations) to be imported from SEG-P1 files with multiple header records. Interpreted results (up to 200 spreads) can be merged with SEG-P1 files to produce a data file giving shot/geophone point and estimated static value at each point in the SEG-P1 file. Static value can be weathering correction only or full datum plus weathering static correction. These results can then be imported to a processing package as a first estimate of static corrections.
GREMIX 15 and GREMIX 15S has all the features of GREMIX V2 and GREMIX S respectively but its data handling capacities has been increased. Please refer to the product selection table for the data handling capacities of each program.
Product Selection Table
|GREMIX v2||GREMIX 15||GREMIX S||GREMIX 15S|
|Max number of Shots||16||16||16||16|
|Max number of Shots/spread||9||15||9||15|
|Max number of Geophones/Shot||96||96||69||96|