Low salinity water injection (LSWI) is gaining popularity as an improved oil recovery technique in both secondary and tertiary\ninjection modes. The objective of this paper is to investigate the main mechanisms behind the LSWI effect on oil recovery from\ncarbonates through history-matching of a recently published coreflood. This paper includes a description of the seawater cycle\nmatch and two proposed methods to history-match the LSWI cycles using the UTCHEM simulator.The sensitivity of residual oil\nsaturation, capillary pressure curve, and relative permeability parameters (endpoints and Corey�s exponents) on LSWI is evaluated\nin thiswork. Results showed thatwettability alteration is still believed to be themain contributor to the LSWI effect on oil recovery in\ncarbonates through successfully historymatching both oil recovery and pressure drop data.Moreover, tuning residual oil saturation\nand relative permeability parameters including endpoints and exponents is essential for a good data match. Also, the incremental\noil recovery obtained by LSWI is mainly controlled by oil relative permeability parameters rather than water relative permeability\nparameters.Thefindings of this paper help to gainmore insight into this uncertain IOR technique and propose amechanistic model\nfor oil recovery predictions.
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