US 12,066,589 B2
System and method for characterizing subterranean formations
Martin G. Luling, Paris (FR); Peter Schlicht, Romania (RO); and Tianhua Zhang, Clamart (FR)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Appl. No. 17/759,399
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Jan. 27, 2021, PCT No. PCT/US2021/015198
§ 371(c)(1), (2) Date Jul. 25, 2022,
PCT Pub. No. WO2021/154797, PCT Pub. Date Aug. 5, 2021.
Claims priority of provisional application 62/966,646, filed on Jan. 28, 2020.
Prior Publication US 2022/0381937 A1, Dec. 1, 2022
Int. Cl. G01V 3/00 (2006.01); E21B 47/002 (2012.01); E21B 49/00 (2006.01); G01V 3/24 (2006.01); G01V 3/38 (2006.01)
CPC G01V 3/24 (2013.01) [E21B 47/002 (2020.05); E21B 49/00 (2013.01); G01V 3/38 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for determining properties of at least one subterranean formation in a wellbore at a wellsite, the method comprising:
deploying a downhole tool into the wellbore having a wall with an oil-based mud column coated thereon, the downhole tool having a formation sensor thereon;
collecting at least two currents sent through the mud column and the at least one subterranean formation from the formation sensor;
performing an inversion at the formation imaging unit based on formation data determined from the at least two currents, wherein performing the inversion comprises generating an image of at least a first parameter relative to resistivity of the formation and of at least a second parameter relative to dielectric permittivity of the formation;
identifying a fracture of the wall of the wellbore and determining a type of the fracture using the images of the first and second parameters by determining the material present at the location of the identified fracture utilizing the second parameter,
wherein the type of the fracture may be one of the following: open, closed or partially closed, and
wherein an open fracture is determined to be filled with an oil-based mud material, wherein a closed fracture has been determined to be filled with a dry rock matrix, and wherein the partially closed fracture is determined to be partially filled with the oil-based mud material.