Unconventional oil and gas

Unconventional oil and gas differs from conventional oil and gas not in the nature of the oil or gas itself, but in the type of rock from which such oil and gas has been extracted and the method by which such extraction takes place.

Historically, oil and natural gas has been found in underground reservoirs trapped between geological strata. Vertical wells are drilled into these reservoirs to allow the oil and/or gas to flow out under pressure (or with the use of pumps or compression tools as the pressure within the reservoir declines). Unconventional oil and gas derives from tiny connected pore spaces that contain oil or gas within the rock strata themselves. The oil and gas is essentially trapped within these pore spaces and is unable to flow naturally and requires

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