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US 2022/0035066 A1Published application
Determination of formation water salinity using downhole low frequency electromagnetic measurements and permittivity dispersions based thereon
AssigneeSchlumberger Technology Corporation
InventorsPing Zhang, Shouxiang Ma, Wael Abdallah, Chengbing Liu
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Abstract
Methods and systems are provided for characterizing formation water salinity of subsurface formation using multifrequency permittivity data over a range of frequencies below 1 MHz. The multifrequency permittivity data is processed to determine salinity of formation water contained in the subsurface formation. Other useful formation properties (such as formation water saturation) can be determined based on the formation water salinity.
Claims20
A method for characterizing a subsurface formation, comprising:
- i) configuring and operating a downhole logging tool to conduct downhole electromagnetic measurements on the subsurface formation over a range of frequencies, wherein the downhole electromagnetic measurements are used to determine and store multifrequency permittivity data that characterizes permittivity of the subsurface formation over a set of frequencies less than 1 MHz;
- and
- ii) processing the multifrequency permittivity data to determine salinity of formation water of the subsurface formation.
A system for characterizing a subsurface formation, comprising:
- at least one processor configured to:
- i) obtain multifrequency permittivity data that characterizes permittivity of the subsurface formation over a set of frequencies less than 1 MHz;
- and
- ii) process the multifrequency permittivity data to determine salinity of formation water of the subsurface formation.
1 more element
Dependencies are inferred from the claim text.