Quantitative

Distinction between shale and non-shale Detection of radio-active minerals Estimate shale in 'dirty' sands

Shale content Depth control

Nett./Gross ratio in reservoir section.

Repeat Formation tester

Fluid samples

PVT Analysis Pressure Data

Gamma ray collar locator

Locating lost pipe Casing collar location

Depth measurement for perforation

4-arm dipmeter

Formation dip

Free point indicator

Depth of free point

Calliper survey

Hole diameter

Continuous directional survey

Deviation an azimuth

Fluid type {gas or oil)

Sidewall samples

Lithology

Fluid type (gas or oil)

Cores

Formation homogeneity Show fractures, fossils Deposition patterns Determine stimulation possibilities

Porosity

Calibrate porosity logs Formation permeability

DATA GATHERING

Mudlog

Core

SWS

test

MWD

Logs/MWD

Well seismic

ofossures

sample

Thickress

Po'usily

Resist.

Calliper

Diprneie

r CBL

Ueylh

(x)

X

X

"acies. lithotomies

X

X

X

X

Dip

X

Correlation

X

X

Hardness etc

X

X

Ciilbrntr? soismn:

X

X

T^ickrvess

(X)

X

X

Porcsity

X

(X)

X

Permeability

X

X

(X)

Fluid type

(X)

X

X

X

X

X

X

piOfJertie;;

(x)

X

pressure;;

X

X

distribution

X

X

X

X

saturation

X

X

Borehole Size

X

Borehole dev ation

X

X

Drilling pararreters

X

Cerrent ity

X

Symbol in brackets () indicates Qualitative data only

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