Integrated borehole system for reservoir detection and monitoring
AssigneeKJT Enterprises, Inc.
InventorKurt-Martin Strack
Life of this patent
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Abstract
In one embodiment the invention comprises a system for generating an image of an Earth formation surrounding a borehole penetrating the formation. Resistivity of the formation is measured using a DC measurement, and conductivity and resistivity of the formations is measured with a time domain signal or AC measurement. Acoustic velocity of the formation is also measured. The DC resistivity measurement, the conductivity measurement made with a time domain electromagnetic signal, the resistivity measurement made with a time domain electromagnetic signal and the acoustic velocity measurements are combined to generate the image of the Earth formation.
Claims23
A method for generating an image of an Earth formation surrounding a borehole penetrating said formation, comprising:
- measuring resistivity of the formation with a DC electrical signal;
- measuring conductivity of the formation with a time domain electromagnetic signal;
- measuring resistivity of the formation with a time domain electromagnetic signal;
- measuring the acoustic velocity of the formation;
- and
- combining said resistivity measured with a DC electrical signal, said conductivity measured with a time domain electromagnetic signal, said resistivity measured with a time domain electromagnetic signal and said measured acoustic velocity to generate said image of an Earth formation.
A method for generating an image of an Earth formation surrounding a borehole penetrating said formation, comprising:
- utilizing measurements of formation resistivity measured with a DC signal to generate a preliminary image of the formation;
- developing an Earth model of said formation based on said measurements with a DC signal;
- calculating a response to the Earth model for a tool configuration utilized for measuring said formation resistivity with a DC signal;
- comparing said calculated response to said measurements of formation resistivity with a DC signal;
- modifying said Earth model based on said comparison;
- and
- combining measurements of conductivity and resistivity of said formation made with an electromagnetic signal and acoustic velocity measurements with said measurements of formation resistivity measured with a DC signal to refine said Earth model.
A tool for well logging a subsurface formation penetrated by a borehole, comprising:
- A central unit comprising a communication system for communication with surface equipment,
- at least one three component instrument which may be adapted to either transmit or sense a magnetic field positioned on said central unit;
- at least two electrode assemblies positioned on said central unit, said electrode assemblies having a plurality of electrode contact positioned thereon so that said contacts may be utilized as a ring electrode or as discrete electrodes;
- a seismic sensor positioned on said central unit;
- at least one auxiliary unit spaced apart on said tool from said central unit;
- at least one three component instrument which may be adapted to either transmit or sense a magnetic field positioned on said auxiliary unit;
- at least two electrode assemblies positioned on said auxiliary unit, said electrode assemblies having a plurality of electrode contact positioned thereon so that said contacts may be utilized as a ring electrode or as discrete electrodes;
- a seismic sensor positioned on said auxiliary unit;
- and
- a control system on said central unit for controlling the operation of said tool.
Dependencies are inferred from the claim text.