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...y between 6330 and 6370 ft is caused by porosity not detected by the gamma-gamma density log. The broader difference anomaly observed over the length of the

Example of correlating ROP with gamma ray curves.

...alues of greater than 1–2%, depending on the degree of thermal maturation. Gamma-ray values in some wells have been adjusted according to offset shale basel

A typical log showing SP, gamma ray, dual Induction, and sonic measurements. Copyright: Schlumberger, 1983.

A typical log showing density, compensated neutron, Pe, gamma ray, and caliper measurements. Copyright: Schlumberger, 1983.

Gamma ray correlation (dip section) of a series of prograding shoreface sandstone

...hile (from Beaubouef, 2004). The lower section shows a series of idealized gamma ray logs. Reprinted with permission from the AAPG.

...ska (from Tye et al., 1999). Reprinted with permission from the AAPG. GR = gamma ray. From Shepherd, M., 2009, Deltaic reservoirs, in M. Shepherd, Oil field

...et al., 1999). Reprinted with permission from the Geological Society. GR = Gamma Ray; RFTtrade = Repeat Formation Tester; UKCF = Upper Kimmeridge Clay Forma

Gamma-ray, density, neutron, and sonic log response of a sandstone and shale sequ

...ake the cross section more compact. The left track of each log is an SP or gamma ray trace and the right track is a resistivity trace. (From Slatt et al., 1

...rinted with permission from the AAPG. SP = spontaneous potential log; GR = gamma-ray log. Shepherd, M., 2009, Lithofacies maps, in M. Shepherd, Oil field pr

...of major depositional environments. The curve on the left shows the SP or gamma ray response and the curve on the right shows the relative grain size profi