Changes

{| class = "wikitable"

{| class = "wikitable"

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! Type

! Type || Definition

! Definition

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| Potential source rock

| Potential source rock || Rock which contains [[organic matter]] in sufficient quantity to generate and expel hydrocarbons if subjected to increased [[thermal maturation]].

| Rock which contains [[organic matter]] in sufficient quantity to generate and expel hydrocarbons if subjected to increased [[thermal maturation]].

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|-

| Effective source rock

| Effective source rock || Rock which contains organic matter and is presently generating and/or expelling hydrocarbons to form commercial accumulations.

| Rock which contains organic matter and is presently generating and/or expelling hydrocarbons to form commercial accumulations.

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|-

| Relic effective source rock

| Relic effective source rock || An effective source rock which has ceased generating and expelling hydrocarbons due to a thermal cooling event such as [[uplif]]t or [[erosion]] before exhausting its organic matter supply.

| An effective source rock which has ceased generating and expelling hydrocarbons due to a thermal cooling event such as [[uplif]]t or [[erosion]] before exhausting its organic matter supply.

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| Spent source rock

| Spent source rock || An active source rock which has exhausted its ability to generate and expel hydrocarbons either through lack of sufficient organic matter or due to reaching an [[overmature]] state.

| An active source rock which has exhausted its ability to generate and expel hydrocarbons either through lack of sufficient organic matter or due to reaching an [[overmature]] state.

|}

|}