Processing screen showing
enlarged windows for firstbreak picking
Picking of firstbreaks 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. Traveltime curves can be
displayed while picking.
Autopicking allows for automatic
picking of all records at once or for individual records. Picking can also
be done by displaying all relevant traveltime 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 traveltime 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.
Supported Seismographs
- ABEM Geophysics
- - TERRALOC MARK III
- - TERRALOC MARK VI
- BISON Instruments Inc.
- - Geopro - 1 8000 series
- - Geopro - 2 7000 & 9000 series
- Geometrics
- - Seisview w/ math coprocessor
format
- - Seisview w/o math coprocessor
format
- - ES-2401 (pseudo-SEG2 format)
- - Other instruments that
support SEG2
- OYO Corporation
- - McSEIS
- - DAS1
- Scintrex Ltd
- - ECHO-2
- SEG2 Standard Format
GREMIX
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.
MATHEMATICAL BASIS
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).
GREMIX Features:
Up to four layers, one deduced
from direct arrivals and three deduced from refractions.
Interactive editing of the
traveltime data including geophone elevations, uphole and system delay
times,
Interactive assignment of
arrival times to layers
Interactive graphical editing
of reciprocal times
Implicit phantoming through
examination of all possible travel time pairs.
Listings that display
interpreted velocities and time depths for each layer
- Four velocity analysis
methods
- Full GRM
- Partial GRM
- Optimum X-Y
- Time delay
Plate style output of traveltime
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 |
| Statics |
N |
N |
Y |
Y |
