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UNIT 4
FORMATION EVALUATION
Lead-in. T. elicits the ideas from the students as they suggest things
connected with Formation evaluation and make collective mind map
(spidergram) on the board as the ideas are suggested, so that they can see
how T. draws out the aspects of the topic. The reasoning behind mind map is
that Ss do not think in an ordered or linear way, but rather explore a topic by
moving between its various aspects.
This activity will prepare Ss to work with the topic of the Unit 4.
Formation evaluation tools
Tools to detect oil and gas have been evolving for over a century.
The simplest and most direct tool is well cuttings examination.
Mud logging
Mud logging is a well logging process in which drilling mud and drill bit
cuttings from the formation are evaluated during drilling and their properties
recorded on a strip chart as a visual analytical tool and stratigraphic cross
sectional representation of the well.
Coring – is the central and most important part of anything. In the oil and gas
industry it may be defined as “the cutting and removal of a cylindrical sample
of rock from the well bore.”
Exercise 8. Complete the sentences using the text terminology.
1. acoustic velocity, conductivity, resistivity
2. drilling mud
3. gamma-ray logs
4. acoustic logs
5. density log
6. induction electrical logs
7. velocity
8. sonde, drilling mud