RESERVOIR

Question 1

What is a porous and permeble rock unit capable of storing and containing hydrocarbons coming from the source rock?

Answer 1

Reservoir Rock

Question 2

What rocks can act as reservoir?

Answer 2

Any rock as long as it is porous and permeable

Question 3

What are the most abundant reservoir rocks?

Answer 3

Sandstones
Carbonates

Question 4

Porosity of a reservoir rock?

Answer 4

20-50%

Question 5

Permeability of a reservoir rock?

Answer 5

K=10mD to >1000mD

Question 6

Most productive reservoir

Answer 6

Carbonates

Question 7

Porosity of Sandstone

Answer 7

25-40%

Question 8

Porosity of carbonate

Answer 8

10-50%

Question 9

Pores that communicate with other by more than one throat passage

Answer 9

Caternary Pore

Question 10

Pores that have only one throat passage

Answer 10

Cul de Sac Pore

Question 11

Pore with no throat passage

Answer 11

Closed Pore

Question 12

Primary vs Secondary Porosity

Answer 12

Primary refers to pores formed during rock formation during deposition and sedimentation
Secondary refers to pores formed after deposition

Question 13

Porosity as a function of sorting

Answer 13

The more well sorted, the higher the porosity since there will be more grain contacts that grain filling

Question 14

Refers to the SPACING or DENSITY PATTERNS of GRAINS in a sed rocks and is a function of GRAIN SIZE, GRAIN SHAPE and DEGREE OF COMPACTION

Answer 14

Grain Packing

Question 15

Which grain arrangement will give the least porosity?

Answer 15

Rhombohedral

Question 16

Which grain packing will give the most porisity?

Answer 16

Cubic

Question 17

Units of permeability

Answer 17

Millidarcy (for reservoirs)

Question 18

Permeability as a function of Grain Size

Answer 18

As grain size decreases, permeability decreases (Direct)

Question 19

permeability as a function of sorting

Answer 19

The more poorly sorted a rock is the lower its permeability

Question 20

Which is more permeable sandstones in Pontbars, beaches, or dunes?

Answer 20

Pointbars
Beaches
dunes

Question 21

Type of reservoir created by folding of thich compacted reservoir rocks with accumulation under an anticline or some trap and hrdrocarbons would better separated due to lower temperature and pressure

Answer 21

Shallow Reservoir

Question 22

A reservoir created by servere faulting in which hydrocarbons would be less separated with more gas in solution and oil of reduced viscoity because of higher temp. Often reduced porosity and permeability

Answer 22

Deep reservoir

Question 23

Well sorted sandstones

Answer 23

Clean sands

Question 24

Poorly sorted sandstones because of significant amount of silt and clay sized particles

Answer 24

Dirty Sands

Question 25

Areas of Sandstone Accumulation

Answer 25

River Channels Deltas Beaches Lakes Submarine Fans

Question 26

Porosity type of carbonates when pores are larger than grains

Answer 26

Vuggy

Question 27

Pores between grains

Answer 27

Intergranular

Question 28

Pores within grains

Answer 28

Cellular

Question 29

Latitude of Carbonate formation

Answer 29

low latitudes 30 deg N and S of equator

Question 30

Diagenetic processes which enhances secondary poroisty

Answer 30

Dolomitization Facturing Dissolution Recrystallization

Question 31

Country which has granite as reservoir

Answer 31

Vietnam

Question 32

Enhancement of unconventional reservoir by injecting HCL thus dissolvig cement of the reservoir

Answer 32

Acidization

Question 33

A method which liquid with sand is driven off into the reservoir under high pressure

Answer 33

Hydraulic Fracturing Fracking