Changes

  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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}}

Each [[Kerogen types|kerogen type]] has its own relationship to maturity parameters.  Maturity measurements are made on materials other than kerogen; therefore, they are not a direct measure of the [[Petroleum generation|hydrocarbon generation]] stage of the [[Source rock|source]] intervals. A relationship must be established between maturity of the geologic section and hydrocarbon generation for each kerogen type in a basin. This relationship can be derived using 1-D basin [[modeling]] techniques.

Each [[Kerogen types|kerogen type]] has its own relationship to maturity parameters.  Maturity measurements are made on materials other than [[kerogen]]; therefore, they are not a direct measure of the [[Petroleum generation|hydrocarbon generation]] stage of the [[Source rock|source]] intervals. A relationship must be established between maturity of the geologic section and hydrocarbon generation for each kerogen type in a basin. This relationship can be derived using 1-D basin [[modeling]] techniques.

==Hydrocarbon generation and maturity==

==Hydrocarbon generation and maturity==

The hydrocarbon generation-depth curve in [[:file:evaluating-source-rocks_fig6-17.png|Figure 1]] indicates where various phases of hydrocarbons would be generated today in the geologic section if a uniform kerogen existed throughout. We would use the following steps to compare the relationships.

The hydrocarbon generation-depth curve in [[:file:evaluating-source-rocks_fig6-17.png|Figure 1]] indicates where various phases of hydrocarbons would be generated today in the geologic section if a uniform kerogen existed throughout. We would use the following steps to compare the relationships.

# Define the hydrocarbon generation stage for a calibrated well based on the depth vs. hydrocarbon yield plot (left figure). For example, the onset of oil generation occurs at approximately [[length::2.1 km]]. Then transfer to the depth versus maturity plot (in this case vitrinite reflectance, right figure) and follow across at [[length::2.1 km]] until you reach the maturity profile. This vitrinite reflectance value (0.55 %R_o ) would indicate the onset of hydrocarbon generation in this well.

# Define the hydrocarbon generation stage for a calibrated well based on the depth vs. hydrocarbon yield plot (left figure). For example, the onset of oil generation occurs at approximately [[length::2.1 km]]. Then transfer to the depth versus maturity plot (in this case [[vitrinite reflectance]], right figure) and follow across at [[length::2.1 km]] until you reach the maturity profile. This vitrinite reflectance value (0.55 %R_o ) would indicate the onset of hydrocarbon generation in this well.

# Apply this relationship to predict the generation zones for this specific kerogen in wells with similar thermal and burial histories in the basin for which maturity data are available.

# Apply this relationship to predict the generation zones for this specific kerogen in wells with similar thermal and burial histories in the basin for which maturity data are available.

|-

|-

! Hydrocarbon generation zone

! Hydrocarbon generation zone

! Vitrinite refl., % R_o, Type II

! [[vitrinite reflectance|Vitrinite refl.]], % R_o, Type II

! Vitrinite refl., % R_o, Type III

! Vitrinite refl., % R_o, Type III

! Transformation ratio, %, Type II

! Transformation ratio, %, Type II

| 3500

| 3500

|-

|-

| Onset gas/cracking liquids

| Onset gas/[[cracking]] liquids

| 0.95

| 0.95

| 1.35

| 1.35