María Inés Oeste, an oil and gas field in Argentina's Magallanes Foreland Basin (also called Austral Basin) produces from María Ineés sandstones that are known to represent the base of a second order transgressive system tract (TST), deposited during Late Maastrichtian times in a coastal to open shelf environment. Figure 1 outlines the basic tectonic framework of the Austral Basin.

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Since 1994, in the portion of Austral Basin shown in Figure 2, bright spots have traditionally been used as hydrocarbon indicators for Mar'a Inés sandstone reservoirs. These reservoirs, about 50-m thick, contain either oil or gas and the structural...

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