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Engineers and drillers use well logs to measure depths of formation tops, thickness of formations, porosity, water saturation, temperature, types of formations encountered, presence of oil and/or gas, estimated permeability, reservoir pressures and formation dip -- ultimately determining whether a well is commercially viable or not and whether casing, cementing and completion should be run on a well. It's not only a journal of what is perforated below the surface, but also a predictor of success
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