Assessment of gas-hydrate saturations in the Makran accretionary prism using the offset dependence of seismic amplitudes

作者：Ojha Maheswar^*; Sain Kalachand; Minshull Timothy A

来源：Geophysics, 2010, 75(2): C1-C6.

DOI：10.1190/1.3315861

• geophysical prospecting
• hydrocarbon reservoirs
• rocks
• seafloor phenomena
• seismic waves
• seismology

We estimate the saturations of gas hydrate and free gas based on measurements of seismic-reflection amplitude variation with offset (AVO) for a bottom-simulating reflector coupled with rock-physics modeling. When we apply the approach to data from a seismic line in the Makran accretionary prism in the Arabian Sea, the results reveal lateral variations of gas-hydrate and free-gas saturations of 4-29% and 1-7.5%, respectively, depending on the rock-physics model used to relate seismic velocity to saturation. Our approach is simple and easy to implement.

• 出版日期2010-4