Fracture interpretation with resistivity and sonic logs in biaxial anisotropic formations
AssigneeHalliburton Energy Services, Inc.
InventorJunsheng Hou
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Abstract
Evaluation of formation and fracture characteristics based on multicomponent induction (MCI) and multipole sonic logging (MSL) data includes automated calculation of inverted biaxial anisotropy (BA) parameters for the formation by performing an iterative BA inversion operation based on the MCI log data and using a BA formation model that accounts for transfers by axial formation anisotropy to resistivity. The inverted BA parameters and the processed MSL data can be used, in combination, to calculate a quantified value for an identification function, to indicate estimated presence or absence of a fracture in the formation.
Claims16
A method comprising:
- accessing multicomponent induction (MCI) and multipole sonic logging (MSL) data captured by measurement tools in a borehole extending through a subsurface formation;
- calculating, using one or more computer processors, inverted biaxial anisotropy (BA) parameters by performing an iterative inversion operation on the MCI data;
- performing fracture analysis, using one or more computer processors, to identify one or more fracture properties of the subsurface formation based at least in part on the MSL data and one or more of the inverted BA parameters;
- operating a controlled device based at least in part on the fracture analysis,
- wherein performing the fracture analysis further comprises identifying presence of a fracture in the formation by calculating a value of an identification function based on formation parameters calculated from the MCI and MSL data;
- wherein the identification function is variable as a function of the inverted BA parameters, an inverted TI parameter, and a parameter from the MSL data;
- determining if the value of the identification function meets a threshold value;
- and
- based upon the determination, identifying the presence of a fracture in the formation.
A system comprising:
- a data access module to access multicomponent induction (MCI) and multipole sonic logging (MSL) data captured by measurement tools in a borehole extending through a subsurface formation;
- and
- an inversion module that comprises one or more computer processors to calculate inverted biaxial anisotropy (BA) parameters by performing an iterative BA inversion operation based on the MCI data;
- and
- a fracture identification module that comprises one or more computer processors to identify one or more fracture properties of the subsurface formation based at least in part on the MSL data and one or more of the inverted BA parameters,
- wherein the identification comprises identifying presence of a fracture in the formation by calculating a value of an identification function based on formation parameters calculated from the MCI and MSL data;
- wherein the identification function is variable as a function of the inverted BA parameters, an inverted TI parameter, and a parameter from the MSL data;
- wherein the identification further comprises:
- determining if the value of the identification function meets a threshold value;
- and
- based upon the determination, identifying the presence of a fracture in the formation.
A computer readable storage medium having stored thereon instructions for causing a machine, in response to execution of the instructions by the machine, to perform operations comprising:
- accessing multicomponent induction (MCI) and multipole sonic logging (MSL) data captured by measurement tools in a borehole extending through a subsurface formation;
- calculating, in an automated procedure using one or more computer processors, inverted biaxial anisotropy (BA) parameters by performing an iterative BA inversion operation based on the MCI data and performing fracture analysis to identify one or more fracture properties of the subsurface formation based at least in part on the MSL data and one or more of the inverted BA parameters,
- wherein performing the fracture analysis further comprises identifying presence of a fracture in the formation by calculating a value of an identification function based on formation parameters calculated from the MCI and MSL data;
- wherein the identification function is variable as a function of the inverted BA parameters, an inverted TI parameter, and a parameter from the MSL data;
- determining if the value of the identification function meets a threshold value;
- and
- based upon the determination, identifying the presence of a fracture in the formation.
Dependencies are inferred from the claim text.