SH/DP, Log analysis training program/ Pre-selection test

1.

1 point

Diagenetic reservoir boundaries typically follow depositional facies boundaries.

True

False

2.

1 point

The Highest OWC contact on a structural indicates:

Poorest quality of reservoir rock

The free water-level

Best quality of reservoir rock

3.

1 point

What case and petrophysical factors will result in computing 100% Computed Sw and if the zone is tested it will not flow water nor hydrocarbon

Medium pore throats, long hydrocarbon carbon column and intraparticle porosity

Large pore throats short hydrocarbon carbon column and interparticle porosity

Small pore throats short hydrocarbon column and intraparticle porosity

Micro - fractured reservoir, small pore-volume, high resistivity, high “Archie – m” and very long hydrocarbon column

4.

1 point

A good starting point (a first method to evaluate rock properties) in evaluating the quality of a depositional carbonate reservoir is the ____________________

Genetic classification of carbonate pore types

Mud log of cuttings that might show stratigraphic tops and facies changes

Dunham classification of core samples

Shape of the gamma ray – resistivity log traces

5.

1 point

Carbonate porosity can exceed 47 percent because of: _____________________

Dissolution combined with inter and intra-crystalline porosity

Pressure solution effects

Anhydrite

Replacement by dolomite

6.

1 point

Pore throat size (radius) can be calculated from the "________________" equation

Capillary pressure (Laplace or Washburn)

Darcy

Archie

Wettability

7.

1 point

Which method is not a basic form of static petrophysical rock typing is _____________

Smith methods

Winland/Pittman

CoreLabs - FZI

Aramco Rosetta Stone

8.

1 point

Which type of core measured permeability is always the highest

Effective permeability

Absolute permeability (ka)

Relative permeability

Klinkenberg corrected permeability

9.

1 point

What factors best describe how carbonate pore systems change from water wet to oil wet

Due to rock properties

Due to a combined effect of pore geometry, texture, fluid type and fluid properties

Due to fluid properties

Due to a combined effect of mud properties, porosity and permeability

10.

1 point

Q/A = k ((h1-h2)/L) is a the original form of the "_______________" equation

Wettability

Darcy

Archie

Capillary pressure

11.

1 point

If a limestone core sample is described as being vuggy, with intraparticle porosity and low absolute permeability…..what is a reasonable range of the Archie cementation exponents

2.0 to 2.05

1.8 to 2.0

2.5 to 3.5

1.0 to 1.5

12.

1 point

If a dolomite core sample is described as having small and medium scale fractures, low porosity and permeabilities between 1 and 10 mD……what is a reasonable range of the Archie cementation exponents

2.0 to 2.2

2.5 to 3.5

3.5 to 5.5

1.0 to 1.5

13.

1 point

The Free Water Level is defined as "-------------------------"

Net to Gross Ratio is very low

The well initial production is approximately 100% water

Pc = 0

Where the logs compute 100% Sw

14.

1 point

The Winland Equation is

R35 = 10^(0.732 + 0.588*Log Ka – 0.864*log PHI)

R35 = ((largest pore throat radius – smallest pore throat radius)*PHIE*(1-Swi)) / mean pore throat radius

R35 = 10^(RQI + 0.588*log Kro + 0.588*log Krw – 0.864* Log PHI)

15.

1 point

Which equation best describes core bulk volume

Vb = Vp + Vgr

Vb = Vp / Vgr

Vb = Vgr – Vp

16.

1 point

What is the practical application of drainage capillary pressure data (curves)

To determine what ratio of fluids will be produced

To calibrate seismic responses

To determine volumetrics

To compute relative permeability

17.

1 point

What is a practical application for using high pressure mercury injection capillary pressure data and intrusion plots

To determine pore throat distribution and intrinsic properties

To determine residual oil saturation

To determine if the rock is mercury wet

To compute relative permeability

18.

1 point

Which rock would more than likely have a bi-modal mercury intrusion response

Intergranular sandstone

A micro-crystalline dolomite

A vuggy limestone dominated with inter and intraparticle porosity

A black marine shale

19.

1 point

Please select the statement which best describe, why static petrophysical rock types are important in reservoir petrophysics

They help to interpret and understand the distribution of fluids

They help in the understanding of gamma ray responses and how to improve Vsh calculations

They help in the understanding of lithotypes from logs

20.

1 point

If a core sample is dominantly oil-wet, what would be reasonable range of the Archie saturation exponent

2.5 – 3.00

2.0 – 2.10

1.8 – 2.00

1.0 – 1.50

21.

1 point

In the hydrocarbon column as pore throat radius increases how should the corresponding parameters behave (assume water wet-behavior)

Perm decreases, Sw decreases, the length of the transition zone is longer and displacement pressure is lower

Perm increases, Sw increases, the length of transition zone is shorter and displacement pressure is higher

Perm increases, Sw decreases, the length of transition zone is shorter and displacement pressure is lower

22.

1 point

Numerical reservoir simulation models should be build using -------------

Only facies information and petrophysical properties

Only petrophysical rock types and petrophysical properties

Facies information for geometry and petrophysical rock types for flow properties

Any data that you can justify

23.

1 point

Petrophysical rock types can be determined using the Stratigraphic Modified Lorenz Plot

True

False

24.

1 point

What is not a common use of the 2 Component Stratigraphic Modified Lorenz Plot

Determine the number of flow units within a given well at a given geological zone

Use the SMLP plot to check if the geologic representation is “honored” during up-scaling

Determine the number of petrophysical rock types

Used to determine if the water flow rate a zone will produce

25.

1 point

Why are flow units important, which statement is not true

They are the products of core-log-seismic integration

They are quality control products for 3-D reservoir realizations

They allow us to understand the inter-well areas

They allow us to understand the relationship between flow and storage capacities

26.

1 point

In carbonates neutron-density porosity logs should always be displayed using_________ scales

Limestone

Sandstone

Dolomite

Variable

27.

1 point

Use the simple version of Archie Equation – Given Sw = 100% and Rt = 3 Ohmm

Ro = 0.3

Ro = 3

Ro = 0.02

28.

1 point

If Sw = 25% and Ro = 3 Ohmm, what is the closest value to Rt = ?

Rt = 100

Rt = 10

Rt = 50

29.

1 point

Identify the equation for Ro = __________________

Ro = Rw – Rt

Ro = F * Rw

Ro = a / PHI ^ (m)

30.

1 point

In the hydrocarbon column assuming dominant water-wet conditions or mixed wetting conditions please identify how the shape of computed pore throat radius and initial water saturation are related:

The shape of computed pore throat radius and computed water saturation are similar

The shapes have no relationship

The shapes are dependent on lithology and logging parameters

31.

1 point

The gamma ray log response is based on ------------- ?

None

rock texture

Compton scattering

Hydrogen index

32.

1 point

What components are include in Vsh ___________?

GR min and GR max

Vsh = Vsilt + Vclay

Vsh = Vss – Vdol

33.

1 point

Carbonates reservoirs can be deposited as an oil wet system……..?

True

False

34.

1 point

For heavy oil reservoirs (API < 20) , it is best to clean the core samples for a minimum _________ hours for special core analysis ?

24

8

48

72

35.

1 point

Convection oven core drying is unacceptable in __________________ reservoir lithology?

Smectite + illite clay rich sandstones

Kaolinite rich sandstone

Clean sandstone

Limestone

36.

1 point

When a reservoir is in the drainage process what phase is decreasing_________?

Gas

oil

water

37.

1 point

When a reservoir is in the imbibition process what phase is increasing__________?

oil

water

Gas

38.

1 point

Intergranular porosity is when “pore space is”_________________?

Mixed

Within grains

Between grains

39.

1 point

Intraparticle porosity is when ‘pore space is”__________________?

Within particles

mixed

Between particles

40.

1 point

If all the parameters in the Archie equation held constant and m increases from 2 to 3, what is water saturation will _________________?

No change

Increase

Decrease

41.

1 point

What is the primary use for an imbibition capillary pressure curve?

Determine Swirr

Determine Volume-In-Place

Determine An estimate of Sor

42.

1 point

What causes porosity to shift from 47.7% in a cubic pack to 27 % in a Rhombic packing?

Grain shift (0.5-grain size)

The size of the grains

The shape of the grains

43.

1 point

Absolute permeability should be used as input to Darcy’s Law?

True

False

44.

1 point

What method is not used to measure water-oil relative permeability?

Ionic Balanced Steady State

Un-steady State

Steady State

45.

1 point

Relative permeability is used to determine __________________?

The ratios of which fluids will be produced as a function of Sw

Pressures that the fluids are best produced at as a function of Sw

The rates of which fluids will be produced as a function of Sw

46.

1 point

In routine core analysis which property should have the lowest uncertainty?

Porosity

Klinkenberg corrected permeability

Horizontal permeability to air

Grain density

47.

1 point

The T2 distribution from NMR is a good indication of ______________?

Pore size

Density

Lithology

48.

1 point

There is a single definition of effective porosity in petrophysics?

True

False

49.

1 point

What is your best guess for how many equations are available to compute Sw ?

Ten

One

Four

Greater than 20

50.

1 point

In a bi-directional 2-phase relative permeability test, id a phase repeats itself, it is an indication _________________?

Well, sorted grains

Wettability

A bad lab test……