Method and apparatus for optimizing deep resistivity measurements with multi-component antennas

A system for optimizing deep resistivity measurements, comprising:

• a processor;
• and
• a memory device coupled to the processor;
• wherein the memory device contains a set of instructions that when executed by the processor cause the processor to:
• receive one or more first multi-component measurements from a first downhole tool disposed in a borehole, wherein the first downhole tool comprises at least two antennae;
• determine a relative structural dip angle, Φ, of the first downhole tool;
• adjust a tilt angle of at least one of the antenna relative to an axis of the downhole tool, wherein the adjusted tilt angle is based on the relative structural dip angle;
• obtain one or more second multi-component measurements associated with the adjusted tilt angle;
• and
• determine a formation characteristic based, at least in part, on the one or more second multi-component measurements without including anisotropy effects.

A method for optimizing deep resistivity measurements, comprising:

• obtaining one or more first multi-component measurements from a downhole tool disposed in a borehole, wherein the downhole tool comprises at least two antennae;
• determining a first relative structural dip angle, Φ1, of the downhole tool based on the one or more first multi-component measurements;
• adjusting at least one of the antenna to a first tilt angle relative to the axis of the tool, wherein the first tilt angle is based on the first relative structural dip angle of the downhole tool;
• obtaining one or more second multi-component measurements associated with the first tilt angle;
• determining a second relative structural dip angle, Φ2, of the downhole tool based on the one or more second multi-component measurements;
• if stopping criteria are met, determining a distance to a formation boundary using the one or more second multi-component measurements;
• and
• if the stopping criteria are not met,
• adjusting the first tilt angle to a second tilt angle, wherein the second tilt angle is based on the second relative structural dip angle,
• obtaining one or more third multi-component measurements associated with the second tilt angle, and
• determining a third relative structural dip angle of the downhole tool based on the one or more third multi-component measurements.