Page 194 - Geology of Carbonate Reservoirs

REVIEW QUESTIONS 175

should read Machel (1987a) . An extensive reference on fluid inclusion analyses is
Roedder (1984) , “ Fluid Inclusions: An Introduction to Studies of All Types of Fluid
Inclusions, Gas, Liquid, or Melt, Trapped in Materials from Earth and Space, and
Their Application to the Understanding of Geologic Processes. A recently updated
book on stable isotope geochemistry is by Hoefs (2004) , Stable Isotope Geochemis-
try . A good reference on electron microprobe analysis is by Newbury et al. (2003)
Scanning Electron Microscopy and X - Ray Microanalysis.

REVIEW QUESTIONS

6.1. Is diagenesis the same thing as metamorphism? If not, how are they
different?

6.2. How would you rank the mechanisms of diagenesis in their order of infl uence,
or impact, on reservoir quality?
6.3. What is the difference between replacement and recrystallization?

6.4. What are good indicators to distinguish between hybrid 1A (depositional
attributes dominant) and 1B (diagenetic attributes dominant) pore types?

6.5. What examples can you give of type 1A and 1B hybrid pores?

6.6. Explain how recrystallization can either enhance or reduce porosity.

6.7. What types of diagenesis are associated exclusively with pore enhancement

and with pore reduction?

6.8. What value is the gamma ray log as an aid in searching for erosional uncon-
formities (Type I sequence boundaries) that may be related to diagenetically
altered pore systems?

6.9. Dolomitization is always associated with enhanced porosity, ideally with about

a 12% increase over the original amount of porosity in the parent limestone.
True or false? Explain.

6.10. The most rapid decrease in porosity with burial occurs in the upper 1000 m of
depth. True or false? Explain.
6.11. Can wireline logs, the seismograph, or other indirect methods of measurement

identify genetic pore types in carbonate rocks? If yes, explain which methods
and how they work. If no, can anything be done to identify genetic pore
types?
6.12. What is the point of comparing structure maps and interval isopach maps with

porosity maps in diagenetic reservoirs?