US 10,295,698 B2Granted

Multi-component induction logging systems and methods using selected frequency inversion

AssigneeHalliburton Energy Services, Inc.

InventorsDagang Wu, Junsheng Hou, Burkay Donderici, Luis E. San Martin

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Abstract

Formation properties may be more efficiently derived from measurements of multi-frequency, multi-component array induction tools, by emphasizing the measurements associated with shorter spacings/lower frequencies in certain regions and short-to-middle spacings/higher frequencies in other regions. In at least one embodiment, a disclosed logging system includes a logging tool that when conveyed along a borehole through a formation obtains multi-component transmit-receive antenna coupling measurements with multiple arrays having different antenna spacings; and a processing system that operates on the measurements. The processing system derives from said measurements one or more formation parameter estimates; determines measurement weight coefficients for a cost function based on said one or more formation parameter estimates; and inverts said measurements with said cost function to obtain one or more enhanced parameter estimates.

Claims18

Dependent claims

A logging method for inverting signals to derive formation parameters that comprises:

conveying a logging tool along a borehole through a formation, wherein the logging tool comprises:
a multi-component transmit antenna;
a plurality of axial antennas;
and
a plurality of multicomponent receive antennas;
transmitting a signal at different frequencies from the multi-component transmit antennas;
measuring the signal with the plurality of multi-component receive antennas;
determining a multi-component transmitter-receiver coupling measurements from the measured signal;
deriving from said measurements one or more formation parameter estimates;
determining measurement weight coefficients for a cost function based on said one or more formation parameter estimates, wherein the one or more formation parameter estimates is the initial formation resistivity at a given borehole position;
inverting said measurements in a radial 1D inversion using said cost function to obtain one or more enhanced parameter estimates;
identifying bed boundaries;
selecting a processing window profile with a selected width from a current layer of interest;
and
inverting said measurements in a vertical 1D inversion using said cost function to obtain one or more further enhanced parameter estimates.

12 more elements

A logging system for inverting signals to derive formation parameters that comprises:

a logging tool, wherein the logging tool is a multi-component induction logging tool comprising:
a transmitter antenna, wherein the transmitter antenna includes three orthogonal transmitter coils and wherein each of the three orthogonal transmitter coils are oriented parallel to the logging tool X-axes, Y-axes, or Z-axes;
a bucking receiver, wherein the bucking receiver includes three orthogonal bucking coils and wherein each of the three orthogonal bucking coils are oriented parallel to the logging tool X-axes, Y-axes, or Z-axes;
and
a main receiver antenna, wherein the main receiver antenna includes three orthogonal receiver coils, wherein each of the three orthogonal receiver coils are oriented parallel to the logging tool X-axes, Y-axes, or Z-axes, and when conveyed along a borehole through a formation obtains multi-component transmit-receive antenna coupling measurements with multiple arrays and multiple frequencies;
and
a processing system operating on said measurements, said operating including:
deriving from said measurements one or more formation parameter estimates;
determining measurement weight coefficients for a cost function based on said one or more formation parameter estimates, wherein the one or more formation parameter estimates is the initial formation resistivity at a given borehole position;
inverting said measurements in a radial 1D inversion with said cost function to obtain one or more enhanced parameter estimates;
identifying bed boundaries;
and
inverting said measurements in a vertical 1D inversion using said cost function to obtain one or more further enhanced parameter estimates.

10 more elements

Dependencies are inferred from the claim text.