Intro to Petroleum Mid-Term Study Guide

What is the Society of Petroleum Engineers (SPE) Code of Conduct focused on?

Integrity, responsibility, and professionalism.

What are the key components of the SPE Code of Conduct?

Respecting public safety, honesty in reporting, environmental stewardship, and lifelong learning.

Historically, what were initial uses of oil?

Lighting, lubrication, and waterproofing materials.

What does the energy density concept refer to?

The amount of energy stored per unit volume or mass.

How much energy does a barrel of oil contain roughly equivalent to?

Approximately 10.5 years of human labor.

In terms of energy density, what ranks highest among biomass, coal, and oil and gas?

Oil and gas.

What impact did high energy density fuels have on population growth?

Enabled advancements in industry and agriculture, leading to rapid population growth.

What is the projection for oil and gas usage by 2050?

Expected to decline as renewable energy sources increase.

Which areas of the energy transition require subsurface engineering skills?

Carbon capture and storage (CCS), geothermal energy, and hydrogen storage.

What are the elements necessary for conventional hydrocarbon accumulation?

Source rock, migration pathway, reservoir rock, trap, and seal.

What is the difference between conventional and unconventional reservoirs?

Conventional reservoirs allow easy extraction, while unconventional reservoirs require advanced techniques.

What must a source rock contain?

Significant organic material, kerogen type, sufficient thermal maturity, and migration capability.

What are typical reservoir rocks?

Sandstone, limestone, and dolomite.

How do clastic reservoirs differ from carbonate reservoirs?

Clastic reservoirs are sedimentary with fragmented grains; carbonate reservoirs form from marine organisms.

What are typical depositional environments for clastic sediments?

Rivers, deltas, beaches, and deserts.

What are laminations in sedimentary rocks?

Layers often formed by seasonal variations in deposition.

How is clastic sedimentary rock described?

By grain size, sorting, and composition.

What is the Phi grain size scale?

A logarithmic scale used to classify sediment grains.

What factors increase clastic porosity?

Rounded, well-sorted, and smaller grain sizes.

What are post-depositional factors affecting porosity and permeability?

Compaction, cementation, and dissolution.

Which rock types typically act as seals in clastic rocks?

Shale and mudstone.

What are common trapping configurations for hydrocarbons?

Structural (anticlines, faults) and stratigraphic traps.

What key stages are involved in sedimentation processes?

Sedimentation, compaction, uplift, erosion, and burial.

What does the theory of plate tectonics explain?

The movement of Earth’s lithospheric plates.

What are the three principal subsurface stresses?

Vertical stress, maximum horizontal stress, and minimum horizontal stress.

What characterizes an extensional stress regime?

It is associated with rift basins, like those in East Africa.

What are the characteristics of a compressional regime?

Associated with foreland basins, such as the Rocky Mountains.

What is hydrostatic pressure?

Pressure due to the weight of fluid at a given depth.

What are the organic components commonly found in natural gas?

Methane, ethane, propane, butane, and other hydrocarbons.

What is the significance of methane in hydrocarbons?

It is highly valuable for its versatility as a fuel.

What does specific gravity measure in hydrocarbons?

Density of the hydrocarbon compared to the density of water.

What is API gravity used to measure?

The density of crude oil.

What does viscosity measure in hydrocarbons?

Resistance to flow.

What do phase diagrams represent in relation to reservoir fluids?

Temperature and pressure changes that affect fluid phases.

What is the bubble point in fluid phase terminology?

The pressure where liquid starts to vaporize.

What is the dew point in fluid phase terminology?

The pressure where vapor begins to condense.

How does the PT path in a reservoir differ from that during production?

The reservoir's PT path is stable compared to fluctuations during production.