US 11,719,094 B2
Reservoir characterization using rock geochemistry for lithostratigraphic interpretation of a subterranean formation
Aqeel M. Khalifa, Dhahran (SA); and Edward A. Clerke, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Oct. 23, 2020, as Appl. No. 17/79,157.
Prior Publication US 2022/0127959 A1, Apr. 28, 2022
Int. Cl. E21B 49/00 (2006.01); E21B 49/02 (2006.01); G01N 33/24 (2006.01)
CPC E21B 49/005 (2013.01) [E21B 49/02 (2013.01); G01N 33/24 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for reservoir characterization by identification of lithostratigraphic layers within a subterranean formation based on rock geochemistry of the subterranean formation, the method comprising:
collecting rock samples related to lithostratigraphy of target wells in the subterranean formation;
measuring geochemical/mineralogical parameters of the rock samples with laboratory equipment;
measuring geochemical/mineralogical parameters of the subsurface formation using wellbore geochemical logging tools in the target wells;
measuring formation acoustic velocities for the target wells;
generating characteristic rock sample and log signature patterns for different lithostratigraphic layers based on the measured geochemical/mineralogical parameters and acoustic velocities associated with the different lithostratigraphic layers identified in the target wells;
combining the characteristic log signatures for the different lithostratigraphic layers into a lithographic interpretation using neutron capture spectroscopy (LINS) model; and
identifying the lithostratigraphic layers within the subterranean formation by applying the LINS model to well logs of non-target wells.