Amoco model

Shots

A synthetic off-end survey was performed on the model. Shots were fired every 50 meters along the model while 256 receivers with 25 meter spacing were pushed to the right. Each receiver receiver recorded 384 time samples per shot with gates every 9.9 milliseconds. The header should be formatted as is shown in Table 4

n1=384	d1=0.0099	o1=0	label1=Time	unit1=s
n2=256	d2=0.025	o2=0	label2=Offset	unit2=km
n3=385	d3=0.05	o3=0	label3=Shot	unit3=km

Table 4. Amoco shot header information

The file amoco/shots/SConstruct is presented in Table 5. This file fetches the shot data, appends the header slightly and produces several images from the record.

from rsf.proj import *
# Fetch Files from repository
Fetch("shots.hh","Amoco")
# Convert Files to RSF
Flow('shots','shots.hh', '''dd form=native | 
    put  label1=time label2=offset label3=Shot unit1=km unit2=km unit3=km | 
    scale rscale=.0003048''')
# Plotting Section
Result('zeroOne','shots','''window $SOURCE min2=0 max2=0 size2=1 
    max3=10.6 | 
    grey  pclip=96 color=I screenratio=1.5 gainpanel=a 
    label2=Position label1=Time title= label3=  unit2=km unit1=s
    labelsz=6''')

Result('zeroTwo','shots','''window $SOURCE min2=0 max2=0 size2=1 
    min3=10.6 | 
    grey  pclip=97 color=I screenratio=1.5 gainpanel=a 
    label2=Position label1=Time title= label3=  unit2=km unit1=s
    labelsz=6''')

Result('shot40','shots','''window $SOURCE  min3=14 max3=14 size3=1 | 
    grey  pclip=99 color=I gainpanel=a wantframenum=y  unit1=s label1=Time
    label2=Offset unit2=km label3=Shot unit3=km title=
    screenratio=1.35 labelsz=3''')
End()

Table 5. Scons script that generates RSF formatted Amoco velocity model

Typing Command 2 within the amocoshots directory runs the script.

$$\texttt{bash-3.1\$\ scons\ view}$$ (2)

Several plots are produced. Figures 2a and 2b show the zero offset data acquired on the Amoco model. The plots are split as the large velocity contrast between the left and right side of the model muddles the image when the gainpanel filter plots the data.

zeroOne,zeroTwo
Figure 2. Amoco zero offset shot data, plot (a) goes from 0 to 10.6 km and (b) goes from 10.6 to 20 km. The plots were split as the large velocity contrast in the model makes it difficult to plot both sides on one scale.

shot40
Figure 3. Amoco shot number 280; the source is 14 km from origin

Amoco model