US 12,242,017 B2
Formation analysis incorporating identification of immovable and viscous hydrocarbons
Harish B. Datir, Tananger (NO); Jean-Marc Donadille, Clamart (FR); Oliver C. Mullins, Houston, TX (US); Vladislav Achourov, Tananger (NO); and Lalitha Venkataramanan, Lexington, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 17/310,998
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Mar. 11, 2020, PCT No. PCT/US2020/021952
§ 371(c)(1), (2) Date Sep. 3, 2021,
PCT Pub. No. WO2020/185809, PCT Pub. Date Sep. 17, 2020.
Claims priority of provisional application 62/816,791, filed on Mar. 11, 2019.
Prior Publication US 2022/0128727 A1, Apr. 28, 2022
Int. Cl. G01V 3/38 (2006.01); E21B 49/08 (2006.01); G01V 3/20 (2006.01); G01V 3/32 (2006.01); G01V 20/00 (2024.01)
CPC G01V 3/38 (2013.01) [E21B 49/081 (2013.01); E21B 49/087 (2013.01); G01V 3/20 (2013.01); G01V 3/32 (2013.01); G01V 20/00 (2024.01); E21B 2200/20 (2020.05)] 19 Claims
OG exemplary drawing
 
1. A method of analyzing a formation traversed by a wellbore, the formation including a flushed zone and a noninvaded zone, the method comprising:
determining total porosity and permittivity of the noninvaded zone for an interval of the formation using data obtained from at least one logging device comprising one or more of a resistivity tool, a dielectric tool, and a logging tool run in the wellbore;
generating a saturation model of the interval of the formation using the data obtained from the at least one logging device run in the wellbore, the saturation model including water saturation of the flushed zone for the interval of the formation and water saturation of the noninvaded zone for the interval of the formation;
comparing the water saturation of the flushed zone for the interval of the formation and the water saturation of the noninvaded zone for the interval of the formation as provided by the saturation model, wherein comparing, when using a water-based drilling fluid, comprises:
comparing whether the water saturation of the flushed zone is greater than the water saturation of the noninvaded zone when the water saturation of the noninvaded zone has a value of less than 1;
comparing whether the water saturation of the flushed zone is equal to the water saturation of the noninvaded zone when the water saturation of the noninvaded zone has a value of less than 1; and
comparing whether the water saturation of the flushed zone is equal to the water saturation of the noninvaded zone when the water saturation of the noninvaded zone has a value equal to 1;
wherein comparing, when using an oil-based drilling fluid, comprises:
comparing whether the water saturation of the flushed zone is greater than the water saturation of the noninvaded zone when the water saturation of the noninvaded zone has a value of less than 1;
comparing whether the water saturation of the flushed zone is less than the water saturation of the noninvaded zone when the water saturation of the noninvaded zone has a value of less than 1;
comparing whether the water saturation of the flushed zone is equal to the water saturation of the noninvaded zone when the water saturation of the noninvaded zone has a value of less than 1; and
comparing whether the water saturation of the flushed zone is less than the water saturation of the noninvaded zone when the water saturation of the noninvaded zone has a value of less than or equal to 1; and
determining that the interval of the formation contains movable hydrocarbon, immobile or highly viscous hydrocarbon, or movable formation water based on results of said comparing for use in reservoir analysis.