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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Differential thermal analysis (DTA) provides a valuable scientific method for determining correlation markers and mineral composition of zones. It is based on the accepted technique of identification of chemical compounds through measurement of thermal reactions as the cuttings or cores are subjected to a controlled temperature rise. The thermal curves, plotted in log form, illustrate changes in formation mineralogy, and graphically point out type and amount of clays, carbonates, oxides, quartz, etc. Mineral trends, breaks, and stringers supply correlative values independent of formation fluids, secondary electrical and radiation properties, and presence of paleontological specimens. Because it depends only on basic mineral composition, DTA can succeed where logs and pale are not diagnostic. In addition, this technique provides information essential to the full interpretation of in-the-hole logging and of core analysis.
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