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2. Petroleum geology - Wikipedia

   en.wikipedia.org/wiki/Petroleum_geology

   The next step is the hydrocarbons entering the oil window. The oil window has to do with the source rock being the appropriate maturity, and also being at the right depth for oil exploration. Geoscientists will be need this to gather stratigraphic data of the petroleum system for analysis.

3. Petroleum - Wikipedia

   en.wikipedia.org/wiki/Petroleum

   Petroleum [a] is a naturally occurring yellowish-black liquid mixture. It consists mainly of hydrocarbons, [1] and is found in geological formations.The term petroleum refers both to naturally occurring unprocessed crude oil, as well as to petroleum products that consist of refined crude oil.

4. Black-oil equations - Wikipedia

   en.wikipedia.org/wiki/Black-oil_equations

   The black-oil equations are a set of partial differential equations that describe fluid flow in a petroleum reservoir, constituting the mathematical framework for a black-oil reservoir simulator. [1] The term black-oil refers to the fluid model, in which water is modeled explicitly together with two hydrocarbon components, one (pseudo) oil ...

5. Abiogenic petroleum origin - Wikipedia

   en.wikipedia.org/wiki/Abiogenic_petroleum_origin

   Because natural gas is less dense than oil, as kerogen and hydrocarbons are generating gas the gas fills the top of the available space. Oil is forced down, and can reach the spill point where oil leaks around the edge(s) of the formation and flows upward.

6. Petroleum reservoir - Wikipedia

   en.wikipedia.org/wiki/Petroleum_reservoir

   The thin red circular line in the middle indicates the top of the oil reservoir. Because gas rises above oil, this latter line marks the gas-and-oil contact zone. A petroleum reservoir or oil and gas reservoir is a subsurface accumulation of hydrocarbons contained in porous or fractured rock formations.

7. Unconventional (oil and gas) reservoir - Wikipedia

   en.wikipedia.org/wiki/Unconventional_(oil_and...

   When pressure differences are relatively high, oil and gas rise to the well bore naturally through buoyancy. [c] Where the pressures are low, flow can be assisted with pumps (e.g. nodding donkeys). [2] Schematic cross-section of general types of oil and gas resources featuring unconventional as well as conventional reservoirs

8. Drill stem test - Wikipedia

   en.wikipedia.org/wiki/Drill_stem_test

   Drill stem testing is an oil and gas exploration procedure to isolate, stimulate and flow a downhole formation to determine the fluids present and the rate at which they can be produced. The main objective of a DST is to evaluate the commercial viability of a zone's economic potential by identifying productive capacity, pressure, permeability ...

9. Catagenesis (geology) - Wikipedia

   en.wikipedia.org/wiki/Catagenesis_(geology)

   This ignores the loss of large amounts of hydrocarbons during depressurization. Rock samples at atmospheric pressure have been measured at 0.11–2.13 percent of samples at formation pressure. Observations at well sites include fizzing of rock chips and oil films covering drilling mud pits. Types of organic matter can not be ignored.