Formation characteristics determination apparatus, methods, and systems
AssigneeHalliburton Energy Services, Inc.
InventorsGlenn A. Wilson, Burkay Donderici
Life of this patent
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Abstract
In some embodiments, an apparatus and a system, as well as a method and article, may operate to model electromagnetic data to provide modeled electromagnetic data by solving a first set of surface integral equations that include earth model parameters corresponding to an earth model of a geological formation. Additional activity may include publishing at least some of the modeled electromagnetic data in human-readable form, and/or controlling drilling operations in the geological formation based on the earth model when error between the modeled electromagnetic data and measured electromagnetic data is less than a selected threshold. Additional apparatus, systems, and methods are disclosed.
Claims20
A method, comprising:
- modeling electromagnetic measurements of a geologic formation, wherein modeling the electromagnetic measurements comprises parameterizing an earth model of the geologic formation into surfaces that define interfaces between formation layers based on the electromagnetic measurements and discretizing the surfaces using splines for modeling and splines for inversion;
- calculating resistivity sensitivities using a first set of surface integral equations that include earth model parameters corresponding the surfaces, without voxel-based discretization of the surfaces;
- and
- updating the earth model parameters using the resistivity sensitivities to obtain revised earth model parameters.
A system, comprising:
- at least one measurement device configured to measure resistivity in a geological formation as measured formation resistivity, wherein the measurement device comprises at least one transmitter and/or receiver;
- a processing unit coupled to the at least one measurement device to receive the measured formation resistivity, the processing unit to provide determined modeled electromagnetic data, including modeled formation resistivity, in at least one layer of the geological formation by parameterizing an earth model of the geological formation into surfaces that define interfaces between formation layers based on the measured formation resistivity, discretizing the surfaces using splines for modeling and splines for inversion, and solving a first set of surface integral equations using initial or updated earth model parameters corresponding to the earth model of a geological formation;
- and
- a bottom hole assembly configured to be controlled by a controller, according to the determined modeled electromagnetic data.
Dependencies are inferred from the claim text.