Chapter 2 Flashcards
What is the first and second step in interpretation?
- Determine the type of rock which is being logged.
2. Determine porosity, saturation and permeability of the rocks
What is porosity?
- The capacity of the rock to contain fluid.
- The volume of the non-solid part of the rock divided by the bulk volume
Which of the following has the same log response as Limestone (Calcium Carbonate) ?
Chalk
What cannot be measured/inferred using conventional wireline logging?
Capillary Pressure
What effect does cementation has on porosity?
Decreases porosity
Inclusion of which of the following dramatically increases permeability:
Fractures
Secondary porosity
Cementation
Fractures
Effective permeability to any given fluid in a rock is
Could be less than or equal to absolute permeability
As the pore throat diameter decreases , the height of the transition zone above the Water Oil Contact
Increase
What is the highest porosity anticipated?
47.6%
What is the primary porosity?
Primary porosity is the porosity developed by the original sedimentation process. (Granular)
What are secondary porosity?
Created by processes which occur after deposition. Example: limestone or dolomite which have been dissolved by groundwaters, a process that creates vugs.
What is dolomitization?
Result of shrinking of the solid volume as the material transform from limestone to dolomite.
Determine saturation
Saturation of any given fluid in a pore space is the ratio of the volume of the fluid to the total pore space volume
Determine permability
is a measure of the ability of porous material to transmit fluid.
Determined by Darcys law.
Conditions to use Darcy law to determine permeability?
- linear-laminar flow
- no reaction between fluid and rock
- one phase present at 100% pore space saturation.
