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Logging and Interpetation Technique in the Arkoma Basin
Gas-bearing sandstones in the Arkoma Basin can be effectively located and evaluated with suitable logging programs. When logging in empty hole, the basic tools are Induction-Gamma Ray, Formation Density with Caliper, and Temperature; also, the Neutron can be very useful for assisting in location of the gas pay. The basic tools for mud-filled holes are Induction-Electric, Formation Density and Caliper; here the Microlog may often help find the zones of effective liquid permeability.
Determination of porosity requires a method of adjusting for effects of gas on the Formation Density Log. A chart is presented to enable the determination of both porosity and gas saturation. The zone of favorable permeability can be located by temperature anomalies in empty holes and by the Microlog in mud-filled holes. Examples illustrating these techniques are included.
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