US 11,815,503 B2
Determining source rock maturity based on hydrogen isotopes
Feng Hu Lu, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Nov. 8, 2021, as Appl. No. 17/520,980.
Prior Publication US 2023/0145385 A1, May 11, 2023
Int. Cl. G01N 33/24 (2006.01)
CPC G01N 33/246 (2013.01) [G01N 33/241 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, by a computer system, a dataset comprising calculated wetnesses of and calculated δ2H values associated with hydrocarbon gasses;
determining, by the computer system, a reference line from the dataset;
plotting, by the computer system, the reference line on a plot;
plotting, by the computer system, a sample wetness of and a sample δ2H value associated with a received gas sample received from a hydrocarbon formation on the plot with the reference line to produce a plotted point;
increasing, by the computer system, a δ2H value of the plotted point to provide an adjusted plotted point so that a δ2H value of the adjusted plotted point matches the reference line;
determining, by the computer system, an adjusted δ2H value from the adjusted plotted point, wherein the adjusted δ2H value is the δ2H value of the adjusted plotted point; and
determining, by the computer system, a predicted sample VRo (vitrinite reflectance equivalent) for the received gas sample based on the adjusted δ2H value and a correlation of δ2H values to VRo values, the VRo values correlating with gas maturity.