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In oil and gas industry, classifying carbonate rocks is a major step in core and thin section description. Two classification systems have been widely used in the industry:  

In oil and gas industry, classifying carbonate rocks is a major step in core and thin section description. Two classification systems have been widely used in the industry:  

# Folk (1959<ref name=Flk1959>Folk, R. L., 1959, [https://archives.datapages.com/data/bulletns/1957-60/data/pg/0043/0001/0000/0001.htm Practical petrographic classification of limestones]: AAPG Bulletin, v. 43, p. 1–38.</ref>, 1962<ref name=Flk1962>Folk, R.L., 1962, Spectral subdivision of limestone types, in Ham, W.E., ed., Classification of carbonate Rocks-A Symposium: American Association of Petroleum Geologists Memoir 1, p. 62-84.</ref>) Classification  

# Folk (1959<ref name=Flk1959>Folk, R. L., 1959, [https://archives.datapages.com/data/bulletns/1957-60/data/pg/0043/0001/0000/0001.htm Practical petrographic classification of limestones]: AAPG Bulletin, v. 43, p. 1–38.</ref>, 1962<ref name=Flk1962>Folk, R. L., 1962, [https://archives.datapages.com/data/specpubs/carbona2/data/a038/a038/0001/0050/0062.htm Spectral subdivision of limestone types], ''in'' W. E. Ham, ed., Classification of carbonate Rocks-A Symposium: [https://archives.datapages.com/data/alt-browse/aapg-special-volumes/m1.htm AAPG Memoir 1], p. 62-84.</ref>) Classification  

# Dunham (1962<ref name=Dnhm>Dunham, R. J., 1962, Classification of carbonate rocks according to depositional texture, in Ham, W. E., ed., Classification of Carbonate Rocks: AAPG Memoir 1, p. 108–121.</ref>) Classification  

# Dunham (1962<ref name=Dnhm>Dunham, R. J., 1962, [https://archives.datapages.com/data/specpubs/carbona2/data/a038/a038/0001/0100/0108.htm Classification of carbonate rocks according to depositional texture], ''in'' W. E. Ham, ed., Classification of Carbonate Rocks: [https://archives.datapages.com/data/alt-browse/aapg-special-volumes/m1.htm AAPG Memoir 1], p. 108–121.</ref>) Classification  

Both classifications provide an indication of depositional energy setting and reservoir quality.

Both classifications provide an indication of depositional energy setting and reservoir quality.