subsurface geology of oil and gas...
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Subsurface Geology of Oil and Gas Fields ——Exercise One
The Faculty of the Earth Resources
Zhu Fangbing
2017.10.
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Exercise one:
Drawing a summary map for a drilled well
1. Data Provided:
Geological logging (cutting, drilling-time curve, sidewall
coring)
Geophysics logging (Well logging curve R, SP, GR, NGR)
2. Requirements:
To laminate / to stratification
To identify lithology
To identify / recognize oil-bearing formation and water-bearing
formation
To summarize lithological association
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Exercise one:
Drawing a summary map for a drilled well
Depth
(m) Lithological description
Cutting percentage SP Notes
Legend
Sandstone Shale
Marl Limestone
Dolomite Oil-bearing
Water- bearing
Shale
No core Oil layer
Water layer
R DTL Radioactivity logging curve
Pluse/min NGR
Scale: 1:500
NO.20 Summary maps for a drilled well Mapper:
SC
SC=Sidewall coring; CPI=Columnar section interpretation; DTL=Drilling - time logging.
CPI GR Min/m
1.Two gravels
were collected
from the sidewall
at 922.5-923.5m.
Radioactive
substance-
celestite was
identified in the
laboratory.
2. Due to the hard,
no gravel was
collected from the
sidewall at 975-
980m
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