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WorksheetsKG12303-Formation Evaluation (FE)
Total questions: 30
Worksheet time: 10mins
What is the primary objective of Formation Evaluation (FE) in petroleum exploration and development?
To design the drilling fluid program.
To determine the ability of a borehole to produce petroleum.
To construct the physical infrastructure of the drilling rig.
To analyze the chemical properties of the crude oil.
FE data can be gathered using which of the following tools or methods?
A. Wireline logging instruments.
B. Logging-while-drilling tools.
C. Both A and B
D. Only surface geological mapping.
What is a "log" in the context of Formation Evaluation?
A detailed record of the physical properties of the drilling mud.
A graph representing formation information organized and interpreted by depth.
A surface measurement of the wellhead pressure.
A record of the drilling penetration rate only.
Mud logging involves the evaluation of which materials during drilling?
A. Drilling mud and drill bit cuttings.
B. Only wireline logging instrument readings.
C. Only rock cores extracted from the formation.
D. Formation fluid samples obtained through wireline.
What can mud logging continuously record?
Rate of penetration, lithology, and hydrocarbon shows.
Formation fluid pressure and fluid samples.
Electrical resistivity and acoustic travel time.
Reservoir boundaries and size.
A fluorescent lamp is a useful tool in mud logging for detecting:
Lithological density.
Grain size.
Oil shows.
Rate of penetration.
What is the coring technique where a cylinder of rock is cut with a core barrel?
Sidewall Coring.
Full Core (or Whole Core).
Drill Stem Test.
Production Logging.
Which of the following properties are measured in the laboratory from core samples?
Porosity and permeability.
Fluid saturation.
Grain density.
All of the above.
What is the primary advantage of the "Sidewall Coring" technique compared to taking a full core?
It yields larger rock cylinders.
It is a lower cost operation and can be done after the formation has been drilled.
It requires the drilling operation to stop for an extended period.
It provides detailed lithological descriptions only.
Core preservation is important to prevent which of the following?
Drying out.
Contact with oxygen.
Mechanical damage.
All of the above.
What is the process that usually involves slabbing the core (cutting it lengthwise to make the structure visible) and provides information on ambient porosity and gas permeability?
Special Core Analysis.
Wireline Logging.
Conventional Core Analysis.
Formation Testing.
Which core analysis technique provides information on parameters like capillary pressure and relative permeability?
Conventional Core Analysis.
Special Core Analysis.
Mud Logging.
Gamma Ray Logging.
Open-hole logging is performed:
After the oil or gas well is lined with pipe (cased).
Before the oil or gas well is lined with pipe (cased).
Only when drilling is actively taking place.
Only in non-hydrocarbon bearing formations.
The downhole logging tool instrument lowered into the wellbore on a logging cable is called a:
Drill bit.
Packer.
Sonde.
Core barrel.
Well logging tools measure which properties of the formation?
Electrical properties.
Acoustic properties.
Radioactive properties.
All of the above.
Which type of electrical log measures the natural electrical currents that flow in the rock next to the wellbore?
Resistivity Log.
Induction Log.
Spontaneous Potential (SP) Log.
Dielectric Log.
The SP Log is commonly used for which purposes?
Defining permeable (e.g., sandstone) and impermeable (e.g., shale) layers.
Directly measuring formation permeability.
Determining irreducible water saturation when oil-based mud is used.
Measuring the formation's bulk density.
A rock that contains oil and/or gas saturation will have what characteristic compared to the same rock completely saturated with formation water, as measured by a Resistivity Log?
Lower resistivity.
Higher resistivity.
Higher conductivity.
No difference in resistivity.
In oil-base mud, which is non-conductive, which electrical log is the only option available?
Spontaneous Potential (SP) Log.
Resistivity Log.
Induction Log.
Dielectric Log.
Which log responds essentially to water and is unaffected by the presence of hydrocarbons, making it particularly important for determining irreducible water saturation when oil-based muds are used?
Neutron Log.
Gamma Ray Log.
Dielectric Log.
Spontaneous Potential Log.
What three elements present in rocks are the source of the natural gamma-radioactivity recorded by the Gamma Ray Log?
Iron, Calcium, and Sodium.
Oxygen, Carbon, and Silicon.
Potassium, Uranium, and Thorium.
Hydrogen, Helium, and Lithium.
The Gamma Ray Log is particularly useful for defining what type of beds?
Shale beds
Sandstone beds
Limestone beds
Coal beds
The response of the Neutron Log is primarily a function of the concentration of which atomic nucleus?
Carbon nuclei.
Oxygen nuclei.
Silicon nuclei.
Hydrogen nuclei.
The Neutron Log is considered a porosity log because hydrogen is mostly present in:
The rock matrix minerals.
Drilling mud solids.
Pore fluids (water, hydrocarbons).
The metallic casing.
The Formation Density Log is used to measure the formation's apparent bulk density, which is useful for detecting:
Water flood sensitivity.
Formation lithology.
Relative permeability.
Formation fluid pressure.
In the Sonic/Acoustic Log, how does the velocity of a sound wave relate to a formation's density and porosity?
Dense, low porosity rocks are characterized by high velocity.
Dense, low porosity rocks are characterized by low velocity.
Velocity is only a function of fluid type, not rock properties.
Velocity is proportional to the concentration of hydrogen nuclei.
What is the major advantage of Logging While Drilling (LWD) over traditional wireline logging?
It is less expensive than wireline logging.
It provides wireline-type information as near as real-time as possible.
It provides formation fluid samples only.
It can only be used in cased holes.
Which of the following is a method of Formation Testing?
Wireline testing.
Drill stem test (DST).
Well Test Analysis.
All of the above.
The Drillstem Test (DST) involves isolating and testing the surrounding geological formation through the drill stem. What is set against the wall of the borehole to seal off the test interval from the mud column above?
A drill bit.
A core barrel.
A packer.
A casing shoe.
Which area of cased-hole logging refers to obtaining production or injection profiles over a completed interval?
Reservoir monitoring.
Cement bond logging.
Production logging.
Open-hole logging.
