Reservoir Characterization - Chapter 3

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The warm-water, equatorial regions of the earth, bounded by the two red lines in the map, are where carbonate-bearing organisms thrive. The organisms build individual shells as personal homes (Fig. 3-23) by secreting aragonite or calcite. Other organisms, like algae, have small, needlelike skeletons made of the same minerals. These organisms live in colonies and sometimes grow into reefs, such as coral reefs (Figs. 3-24 and 3-25). After National Geographic magazine.