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FORMATION EVALUATION
CHAPTER 1PART 220/03/20131CGE 674 FORMATION EVALUATION
Shorter tool length meansless rat hole required
Less tool components means shorter rig up andrig down time
TYPICAL LOGGING TOOL20/03/20133
TYPICAL LOGGING TOOL20/03/20134
TOOL CONFIGURATION20/03/20135
WIRELINE UNIT20/03/20136SPONTANEOUS POTENTIAL (SP) 20/03/20137SP TOOL
SP is a recording of the difference between the electrical potential of a movable electrode in the borehole and the electrical potential of a fixed surface electrode20/03/20138
SP TOOLSource: DG Bowen, 2005
Principle of Spontaneous Potential SP LogSource: Halliburton
Source: HalliburtonLiquid junction effectsLiquid junction potential
Source: HalliburtonSP due to membrane potentialResultant SP from liquid junction and membrane potentials20/03/201312Application of SP tool:1. Permeable zone identification2. Fluid type identification 3. Connate water salinity determination Across shales, SP curve defines a more or less straight line to represent shale baseline.Across permeable formation , SP curev show defelection from shale baseline. If the deflection is positive, Rmf