Difference between revisions of "Kerogen type and maturity"
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==Hydrocarbon generation and maturity== | ==Hydrocarbon generation and maturity== | ||
− | [[file:evaluating-source-rocks_fig6-17.png|300px|thumb|{{figure number|1}}. Copyright: results of Genex 1-D basin modeling software, courtesy Institute Français du Petrole.]] | + | [[file:evaluating-source-rocks_fig6-17.png|300px|thumb|{{figure number|1}}Hydrocarbon generation-depth curve. Copyright: results of Genex 1-D basin modeling software, courtesy Institute Français du Petrole.]] |
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. |
Revision as of 19:34, 29 July 2014
Exploring for Oil and Gas Traps | |
Series | Treatise in Petroleum Geology |
---|---|
Part | Critical elements of the petroleum system |
Chapter | Evaluating source rocks |
Author | Carol A. Law |
Link | Web page |
Store | AAPG Store |
Each 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 hydrocarbon generation stage of the 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
The hydrocarbon generation-depth curve in 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.
Step | Action |
---|---|
1 | 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 %Ro ) would indicate the onset of hydrocarbon generation in this well. |
2 | 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. |
See also
- Relationships between maturity and hydrocarbon generation
- Kerogen type and hydrocarbon generation
- Kerogen type and transformation ratio
- Kerogen types: comparison of maturity measures
- Open- vs closed-system generation modeling