Integrated permeability measurement and resistivity imaging tool

A method for investigating an earth formation with a borehole tool having a plurality of electrode means for making electrical contact with a segment of a wall of said borehole and for making measurements relating to an electromagnetic investigation of said earth formation adjacent said segment of said borehole wall, a hydraulic port means substantially adjacent said plurality of electrode means for making hydraulic contact with said formation, a flow means coupled to said hydraulic port means for injecting fluid into said formation and/or for withdrawing fluid from said formation via said hydraulic port means, and hydraulic property measurement means for determining pressures at said hydraulic probe before, during, or after withdrawal or injection of fluid from said formation, said method comprising:

• a) determining a depth at which said borehole tool is to be set;
• b) lowering or raising said borehole tool to approximately said depth;
• c) scanning said formation with said plurality of electrode means to provide first electromagnetic images of said formation at a plurality of different depths near said depth;
• d) using said first electromagnetic images to determine exactly where to set said borehole tool;
• e) setting said borehole tool with said hydraulic port means at exactly a determined location;
• and
• f) with said flow means, withdrawing fluid from and/or injecting fluid into said formation via said hydraulic port means with said hydraulic port means set at exactly said determined location.

A method for investigating an earth formation with a borehole tool having a plurality of electrode means for making electrical contact with a segment of a wall of said borehole and for making measurements relating to an electromagnetic investigation of said earth formation adjacent said segment of said borehole wall, a hydraulic port means substantially adjacent said plurality of electrode means for making hydraulic contact with said formation, a flow means coupled to said hydraulic port means for injecting fluid into said formation and/or for withdrawing fluid from said formation via said hydraulic port means, and hydraulic property measurement means for determining at least pressures at said hydraulic probe before, during, or after withdrawal or injection of fluid from said formation, said method comprising:

• a) setting said borehole tool at a depth in said formation;
• b) with said flow means, withdrawing fluid from or injecting fluid into said formation via said hydraulic port means;
• c) scanning said formation with said plurality of electrode means to provide electromagnetic information regarding said formation at said depth at two different times, a first of said two different times being either before or at a first time during said fluid injection or withdrawal, and a second of said two different times being either at a second time different from said first time during said fluid injection or withdrawal or after said fluid injection or withdrawal.