This study examines the effect of variations in dry rock bulk modulus (Kdry) on compressional wave velocity (Vp) using Gassmann fluid substitution theory and various fluid mixing laws in the context of CO2 sequestration in the Utsira formation at the Sleipner Field. Significant changes in Vp. exceeding 600 m/s. were observed. https://www.lolasalinas.com/