What transformed buried remains of ancient marine organisms into crude oil and natural gas over geologic time?

A petroleum reservoir is capped by a thick layer of rock salt. What is this layer's role?

A drill core has connected pore spaces containing crude oil. In a conventional petroleum system, this porous rock is the

Gas migrates from gas-rich shale into porous sandstone and accumulates beneath an impermeable seal. What type of deposit is this?

Natural gas held in tiny pores within a shale formation is best classified as

A gas pocket occurs in the same reservoir as crude oil. What term describes that gas?

Before drilling an exploratory well, geologists send waves into the ground and measure their reflections. What are they chiefly investigating?

Where are oil and natural gas deposits most commonly found?

Why are crude oil and natural gas classified as nonrenewable on a human time scale?

Petroleum forms from plankton remains that settle into low-oxygen mud on the seafloor. Why does the low oxygen matter?

In a refinery distillation tower, what property primarily separates crude oil into fractions?

Why are gasoline-range fractions collected near the top of a distillation tower?

A refinery collects a very heavy fraction at the bottom of its atmospheric distillation unit. What property explains its position?

A refinery uses heat, pressure, and catalysts to split heavy hydrocarbon molecules into lighter products. This conversion is called

A refinery heats naphtha with catalysts to make higher-octane gasoline components. Which process is being used?

A road contractor needs a sticky petroleum product to bind aggregate in pavement. Which refinery product is appropriate?

A refinery sells a hydrocarbon stream to a plastics manufacturer instead of burning it as fuel. This stream is serving as a

Which set names the three broad functions performed by a modern petroleum refinery?

Why is wellhead natural gas commonly processed before entering a long-distance pipeline?

Technicians blend several refinery streams to meet an octane specification for a motor fuel. Which product are they making?

What is the largest component of natural gas?

Use the table. For the same energy output, which fuel released less CO₂?

When natural gas burns completely, which greenhouse gas is directly produced?

Why can leaks from natural-gas systems be a climate concern even before the gas is burned?

Why is natural gas often described as cleaner-burning than petroleum fuels for equal energy output?

A utility replaces residual fuel oil with natural gas. Which emission change is consistent with this switch?

Which of these vehicle fuels is made by refining crude oil?

A household uses piped natural gas in a furnace. What is the fuel's immediate end use?

At an oil well without a gas pipeline, operators burn associated natural gas rather than venting it. Why can flaring lower the greenhouse impact?

Why do gas utilities add a strong rotten-egg odorant to processed natural gas?

A new oil well produces because pressure inside the reservoir pushes oil toward the wellbore. Which recovery stage is this?

An older oil field injects water into one well to displace oil toward nearby production wells. What stage is being used?

An operator injects steam into a heavy-oil reservoir to lower the oil's viscosity so it flows to the wells. This is an example of

What does hydraulic fracturing do in a low-permeability shale formation?

How can horizontal drilling reduce surface disturbance compared with drilling many separate vertical wells?

In some regions, what oil-and-gas wastewater practice has been linked to larger induced earthquakes?

What is the main role of gathering pipelines at a natural-gas field?

After processing, dry natural gas travels long distances to major consumer areas mainly through

What transport route carries most gasoline from refineries to large storage terminals near consumers?

In 1989, the Exxon Valdez ran aground and spilled oil in which location?