Model-Based Identification of the Base of the Gas Hydrate Stability Zone in Multichannel Reflection Seismic Data, Offshore Costa Rica

<table>Centre: the time-migrated section between CMP 5300–9100 shows the middle slope of profile BGR99-46. Top and Bottom: close ups 1a and 2a are the near offset CMP stacks (141 m–766 m) with incident angles of <svg height="5.7375002" id="M17" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 10.1 5.7375002" width="10.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,5.675)"><path d="M548 311q-21 -57 -59 -94t-89 -37q-53 0 -128 52q-55 38 -84 38q-39 0 -70.5 -23t-45.5 -60l-32 12q21 57 59 94t89 37q53 0 128 -52q55 -38 84 -38q39 0 70.5 23t45.5 60z" id="x223C"></path></g>
</svg>1.5°–9.7°. Close ups 1b and 2b are the far offset CMP stacks (2641 m–3266 m) with incident angles of <svg height="5.7375002" id="M18" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 10.1 5.7375002" width="10.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,5.675)"><path d="M548 311q-21 -57 -59 -94t-89 -37q-53 0 -128 52q-55 38 -84 38q-39 0 -70.5 -23t-45.5 -60l-32 12q21 57 59 94t89 37q53 0 128 -52q55 -38 84 -38q39 0 70.5 23t45.5 60z" id="x223C"></path></g>
</svg>25.9°–37.4°. The colorscale for the offset stacks is modified to emphasize negative reflections. The areas of interest are marked with black ellipses.</table>

International Journal of Geophysics

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Figure 6

Figure 6: Model-Based Identification of the Base of the Gas Hydrate Stability Zone in Multichannel Reflection Seismic Data, Offshore Costa Rica 