Wave Propagation Characteristics in Gas Hydrate-Bearing Sediments and Estimation of Hydrate Saturation

Natural gas hydrate is a new clean energy source in the 21st century, which has become research point of exploration and development technology. Acoustic well logs are one most important assets studies. In this paper, an improved Carcione–Leclaire model proposed by introducing expressions frame bulk modulus, shear modulus friction coefficient between solid phases. On basis, sensitivities velocities attenuations first kind compressional (P1) (S1) waves to relevant physical parameters explored. particular, we perform numerical modeling investigate effects frequency, saturation clay on phase above five waves. The analyses demonstrate that, P1 S1 more sensitive than other parameters. larger saturation, reliable velocity. Besides, velocity saturation. Further, almost nondispersive while their increase with second (P2) (S2) third wave (P3) dispersive seismic band, them significant. Moreover, case grain frame, hydrate-bearing sediments exhibit lower velocities. Clay decreases attenuation P1, S1, P2, S2 P3 little effect content. We compared predicted log data from Ocean Drilling Program (ODP) Leg 164 Site 995B verify applicability model. results agree data. Finally, estimate layer at ODP 204 1247B about 100–130 m below seafloor, 0–27%, average 7.2%.