# Petroleum Production Operations Questions and Answers – Sandstone Reservoirs

This set of Petroleum Production Operations Multiple Choice Questions & Answers (MCQs) focuses on “Sandstone Reservoirs”.

1. In general, Sandstone is a Source rock.
a) True
b) False

Explanation: Sandstone is a well known Reservoir rock. If it has good Permeability and Porosity then we call it a Reservoir rock. Source rock is that rock in which hydrocarbons get deposited initially then moves to the reservoir rock and gets accumulated thereafter from which oil and gas are extracted.

2. Jodhpur fort is made up of which of the following rock?
a) Sandstone
b) Carbonate
c) Shale
d) Limestone

Explanation: Jodhpur fort is made up of Sandstone. Sandstone can accumulate hydrocarbons in the subsurface if it has a good amount of porosity and a seal or cap rock above it.

3. What is the range of the sand size in sandstone?
a) 0.0625 to 5 mm
b) 0.05 to 2 mm
c) 0.0625 to 2 mm
d) 0.05 to 5 mm

Explanation: The range of the sand size in sandstone is 0.0625 to 2mm. Sandstones are generally made up of quartz and feldspar.

4. Sandstone is a Clastic sedimentary rock.
a) True
b) False

Explanation: Yes, Sandstone is a Clastic sedimentary rock. Clastic sedimentary rocks are formed by the weathering process. They break down into small fragments like pebble, sand or clay particles.

5. 1 barrel equals how many gallons?
a) 40
b) 22.2
c) 42
d) 7.48

Explanation: 1 barrel equals 42 gallons, whereas 1 gallon equals to 7.48 cubic feet. 12 inch equals to 1 ft. One bbl also equals to 5.61 cubic feet.

6. If a sandstone reservoir has φ porosity and the area is A, and thickness is h and water saturation is Sw then what will be the Original Hydrocarbon in place?
a) AhφSw
b) Ahφ/(1-Sw)
c) Ahφ(1-Sw)
d) Ah(1-φ) Sw

Explanation: The Original Hydrocarbon in place is calculated by using this formula OHIP = Ahφ(1-Sw). This formula is applicable for any type of reservoir and is of immense importance in reservoir hydrocarbon prediction.

7. Which of the following is correct considering Limestone, Sandstone & Evaporites rocks?

a) I can be Limestone
b) I and II are the same rocks
c) II can be Sandstone
d) II can be evaporites

Explanation: II can be Sandstone or limestone because rock II is a reservoir rock and the cap rock can be evaporites. Evaporites are the excellent cap rock.

Sanfoundry Global Education & Learning Series – Petroleum Production Operations.

To practice all areas of Petroleum Production Operations, here is complete set of 1000+ Multiple Choice Questions and Answers.

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