Changes

[[file:migration-of-petroleum_fig7-14.png|300px|thumb|{{figure number|2}}Procedure for estimating expulsion efficiency. Copyright: McDowell;<ref name=McDowell1975>McDowell, A. N., 1975, What are the problems in estimating the oil potential of a basin? Oil & Gas Journal, June 9, p. 85–90.</ref> courtesy Oil & Gas Journal.]]

[[file:migration-of-petroleum_fig7-14.png|300px|thumb|{{figure number|2}}Procedure for estimating expulsion efficiency. Copyright: McDowell;<ref name=McDowell1975>McDowell, A. N., 1975, What are the problems in estimating the oil potential of a basin? Oil & Gas Journal, June 9, p. 85–90.</ref> courtesy Oil & Gas Journal.]]

In [[migration]] volumetrics, it is important to estimate the original petroleum potential of the [[source rock]]—not just its present measured potential (with increasing [[maturation]], a portion of the original potential will have been realized and is therefore unmeasurable). Estimates of expelled hydrocarbons may be derived by measuring the amount remaining in a source and subtracting that value from the amount that should have been generated from the original assumed kerogen content.

In [[migration]] volumetrics, it is important to estimate the original petroleum potential of the [[source rock]]—not just its present measured potential (with increasing [[maturation]], a portion of the original potential will have been realized and is therefore unmeasurable). Estimates of expelled hydrocarbons may be derived by measuring the amount remaining in a source and subtracting that value from the amount that should have been generated from the original assumed [[kerogen]] content.

Below is a procedure for estimating expulsion efficiency.

Below is a procedure for estimating expulsion efficiency.

# Estimate the original [http://www.thefreedictionary.com/kerogen kerogen] content of the rock using [[total organic carbon (TOC)|TOC]] values measured from source rock samples.

# Estimate the original kerogen content of the rock using [[total organic carbon (TOC)|TOC]] values measured from source rock samples.

# Model the original [[Petroleum generation|hydrocarbon generation]] potential of the source rock using the estimated original kerogen content.

# Model the original [[Petroleum generation|hydrocarbon generation]] potential of the source rock using the estimated original kerogen content.

# Measure the volume of hydrocarbons expelled during [[Rock-Eval pyrolysis|pyrolosis]] (S2).

# Measure the volume of hydrocarbons expelled during [[Rock-Eval pyrolysis|pyrolosis]] (S2).