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US 8,803,077 B2Granted
Super-resolution formation fluid imaging data acquisition and processing
AssigneeSaudi Arabian Oil Company
InventorHoward K. Schmidt
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Abstract
Cross-well electromagnetic (EM) imaging is performed using high-power pulsed magnetic field sources, time-domain signal acquisition, low-noise magnetic field sensors, spatial oversampling and super-resolution image enhancement and injected magnetic nanofluids. The acquired signals are processed and inter-well images are generated mapping electromagnetic (EM) signal speed (group velocity) rather than conductivity maps. EM velocity maps with improved resolution for both native and injected fluids are provided.
Claims9
A method of electromagnetic imaging of a subsurface hydrocarbon reservoir, comprising the steps of:
- emitting pulses of electromagnetic energy signals to travel through the subsurface hydrocarbon reservoir;
- recording waveforms of the emitted electromagnetic energy signals received at a plurality of electromagnetic sensors;
- forming a measure of the travel time of the signals received at the plurality of electromagnetic sensors;
- decomposing the received signals into their frequency components;
- extracting travel time data of the received signals as a function of frequency;
- and
- forming, based on the extracted travel time data as a function of frequency, an inverted velocity image of subsurface features of the subsurface hydrocarbon reservoir.
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Dependencies are inferred from the claim text.