Subsurface Geology of Oil and Gas Fields ——Exercise One

The Faculty of the Earth Resources

Zhu Fangbing

2017.10.

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

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