US 12,259,514 B2
Diagenesis-calibrated rock quality (DCRQ) determination
Mohd Azizi Ibrahim, Dhahran (SA); Mohammed Fuad Alzayer, Al Qatif (SA); Layal Nour Alhussain, Dammam (SA); and Faisal Naif Al-Enezi, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jun. 1, 2022, as Appl. No. 17/804,907.
Prior Publication US 2023/0393302 A1, Dec. 7, 2023
Int. Cl. G01V 20/00 (2024.01)
CPC G01V 20/00 (2024.01) [G01V 2200/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A computer-implemented method, comprising:
determining, by a diagenesis-calibrated rock quality (DCRQ) system using exploration and production (E&P) data, a thorium-uranium ratio for a region of interest;
determining, by the DCRQ system using the E&P data, a percentage of siltstone in a lithology matrix for the region of interest;
determining, by the DCRQ system using the E&P data, a difference between a neutron porosity and a sandstone density porosity for the region of interest;
determining, by the DCRQ system using the E&P data, a rock testability index for the region of interest;
determining, by the DCRQ system, using a petrophysical model, a relative productivity for the region of interest, the petrophysical model combining i) the thorium-uranium ratio, ii) the percentage of siltstone in the lithology matrix, iii) the difference between the neutron porosity and the sandstone density porosity, and iv) and the rock testability index, the petrophysical model generating the relative productivity for the region of interest as a comparisons of productive reservoir layers of a reservoir, the relative productivity being proportional with the thorium-uranium ratio, the difference between the neutron porosity and the sandstone density porosity, and the rock testability index, the relative productivity being inversely proportional with the percentage of siltstone in the lithology matrix;
determining, using the relative productivity, drilling parameters for use in upcoming drilling operations for wells in the region of interest; and
executing drilling operations for wells in the region of interest using the drilling parameters.