Source productivity assay integrating pyrolysis data and X-ray diffraction data

1. A method, comprising:

performing pyrolysis on a source rock, wherein performing pyrolysis on the source rock comprises heating the source rock in an oven;

obtaining pyrolysis data on the source rock based on performing pyrolysis on the source rock;

determining a hydrocarbon generative potential (S2) of kerogen in the source rock from the pyrolysis data;

determining a total organic carbon (TOC) content (in weight %) of the source rock from the pyrolysis data;

determining a maturity of the reservoir (% Ro) from S2 and TOC;

determining a ratio of an oil specific gravity of the source rock to a density of the source rock (API) using the equation

API=Ln(% Ro/0.2534)/.0345;

obtaining x-ray diffraction (XRD) data for the source rock; and

determining an additional parameter from the pyrolysis data, the X-ray diffraction (XRD) data, or both.

2. The method of claim 1 , wherein determining the additional parameter comprises determining a gas/oil ratio.

3. The method of claim 1 , wherein determining the additional parameter comprises determining a productivity of the source rock.

4. The method of claim 1 , further comprising determining a ratio of saturated fluids to aromatic fluids in the source rock (Sat/Aro) using the equation

Sat/Aro=(% Ro/.7842) (1/0.3571)

5. The method of claim 1 , further comprising determining a percent loss of a C 15 + fraction (% Loss n−C 15+ ) of bitumen of the source rock using the equation % Loss n−C 15+ )=API/7.2379 (1/.4508) .

6. The method of claim 5 , further comprising determining a corrected milligrams of distillable hydrocarbon of the source rock per gram of the source rock (S1 corr ) using the equation

S1 corr =S1 o /(1−(% Loss n −C 15+ /100)),

wherein S1 o is an original value of the milligrams of distillable hydrocarbon of the source rock per gram of the source rock.

7. The method of claim 1 , further comprising determining a percent loss of a C 15+ fraction (% Loss n−C 15+ ) of bitumen of the source rock using the equation

% Loss n −C 15+ =API/7.2379 (1/.4508) .

8. The method of claim 7 , further comprising determining a corrected milligrams of distillable hydrocarbon of the source rock per gram of the source rock (S1 corr ) using the equation

S1 corr =S1 o /(1−(% Loss n −C 15+ /100)),

wherein S1 o is an original value of the milligrams of distillable hydrocarbon of the source rock per gram of the source rock as measured by pyrolysis.

9. The method of claim 1 , further comprising determining a ratio of saturated fluids to aromatic fluids in the source rock (Sat/Aro) using the equation

Sat/Aro=(% Ro/.7842) (1/0.3571) ,

wherein % Ro is a maturity of the source rock.

10. The method of claim 1 , wherein determining the additional parameter comprises determining hydrocarbons in place in the source rock.

11. A method of evaluating a source rock, the method comprising:

performing pyrolysis on the source rock, wherein performing pyrolysis on the source rock comprises heating the source rock in an oven;

obtaining pyrolysis data for the source rock based on performing pyrolysis on the source rock;

determining a hydrocarbon generative potential (S2) of kerogen in the source rock from the pyrolysis data;

determining a total organic carbon (TOC) content (in weight %) of the source rock from the pyrolysis data;

determining a maturity of the reservoir (% Ro) from S2 and TOC; and

determining a ratio of an oil specific gravity of the source rock to a density of the source rock (API) using the equation

API=Ln(% Ro/0.2534)/.0345,

wherein % Ro is a maturity of the source rock.

12. The method of claim 11 , further comprising determining a ratio of saturated fluids to aromatic fluids in the source rock (Sat/Aro) using the equation

Sat/Aro=(% Ro/.7842) (1/0.3571) .

13. The method of claim 11 , further comprising determining a percent loss of a C 15 + fraction (% Loss n−C 15+ ) of bitumen of the source rock using the equation

% Loss n −C 15+=API/ 7.2379 (1/.4508) .

14. The method of claim 13 , further comprising determining a corrected milligrams of distillable hydrocarbon of the source rock per gram of the source rock (S1 corr ) using the equation

S1 corr =S1 o /(1−(% Loss n −C 15+ /100)),

wherein S1 o is an original value of the milligrams of distillable hydrocarbon of the source rock per gram of the source rock and (% Loss n−C 15+ /100) scales the loss value to a fraction.

15. A method of evaluating a source rock, the method comprising:

performing pyrolysis on the source rock, wherein performing pyrolysis on the source rock comprises heating the source rock in an oven;

obtaining pyrolysis data for the source rock based on performing pyrolysis on the source rock;

determining a hydrocarbon generative potential (S2) of kerogen in the source rock from the pyrolysis data;

determining a total organic carbon (TOC) content (in weight %) of the source rock from the pyrolysis data;

determining a maturity of the reservoir (% Ro) from S2 and TOC; and

determining a ratio of saturated fluids to aromatic fluids in the source rock (Sat/Aro) using the equation

Sat/Aro=(% Ro/.7842) (1/0.3571) .

16. A method of evaluating a source rock, the method comprising:

performing pyrolysis on the source rock, wherein performing pyrolysis on the source rock comprises heating the source rock in an oven;

obtaining pyrolysis data for the source rock based on performing pyrolysis on the source rock;

determining a hydrocarbon generative potential (S2) of kerogen in the source rock from the pyrolysis data;

determining a total organic carbon (TOC) content (in weight %) of the source rock from the pyrolysis data;

determining a maturity of the reservoir (% Ro) from S2 and TOC;

determining a ratio of an oil specific gravity of the source rock to a density of the source rock (API) using the equation

API=Ln(% Ro/0.2534)/.0345; and

determining a percent loss of a C 15+ fraction (% Loss n−C 15+ ) of bitumen of the source rock using the equation

% Loss n −C 15+ =API/7.2379 (1/.4508) .

17. A method of evaluating a source rock, the method comprising:

performing pyrolysis on the source rock, wherein performing pyrolysis on the source rock comprises heating the source rock in an oven;

obtaining pyrolysis data for the source rock based on performing pyrolysis on the source rock;

determining a distillable hydrocarbon (S1) of kerogen in the source rock from the pyrolysis data;

determining a total organic carbon (TOC) content (in weight %) of the source rock from the pyrolysis data; and

determining a corrected milligrams of distillable hydrocarbon of the source rock per gram of the source rock (S1 corr ) using the equation

S1 corr =S1 o /(1−(% Loss n−C 15+ /100)),

wherein S1 o is an original value of the milligrams of distillable hydrocarbon of the source rock per gram of the source rock and % Loss n−C 15+ is a percent loss of a C15+ fraction of bitumen of the source rock.