Compound Electromagnetic Pulse for Deep Zone Discrimination
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Solution Overview
Problem
Traditional transient electromagnetic sounding at the earth's surface is limited in reaching deep hydrocarbon reservoirs and struggles to differentiate between different depths within the earth formation.
Innovation Solution
A compound pulse of electromagnetic energy is applied from a borehole, comprising a first and second pulse with different amplitudes, to induce a greater current in a specific zone of investigation while minimizing current in other zones, allowing for the estimation of the earth's property based on the induced electromagnetic response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electromagnetic energy pulses are applied to the earth formation, then the electromagnetic signals can be received and processed, but the pulses cannot reach deep hydrocarbon reservoirs and cannot discriminate between different distances into the formation
Solution Approach 1:
The electromagnetic pulse is segmented into multiple discrete frequency components. Each frequency component penetrates to a specific depth zone in the formation, allowing the system to measure different depth intervals separately. This segmentation of the pulse into frequency-based depth zones enables both deep reach and depth discrimination capability.
Solution Approach 2:
The invention transitions from traditional time-domain pulse measurement to frequency-domain analysis. By analyzing the electromagnetic response at multiple frequencies rather than a single broadband pulse, the system can distinguish between different depth zones. This dimensional shift from time to frequency domain enables simultaneous deep penetration and depth discrimination.
2Measurement precision
If a single broadband electromagnetic pulse is used, then the system can operate with simple equipment, but it cannot differentiate between responses from different depth zones
Solution Approach 1:
The system changes the frequency parameter of the electromagnetic pulse to probe different depth zones. By transmitting pulses at multiple discrete frequencies and analyzing the frequency-dependent response, the system achieves zone discrimination. This parameter-based approach allows differentiation of depth zones while maintaining relatively simple equipment compared to more complex imaging systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables effective measurement of the earth's property at deeper depths and improves discrimination between different zones, enhancing the accuracy of hydrocarbon reservoir detection.
Implementation Method 1
The pulses induce circulations of current in the earth formation. The circulations of current in turn induce electromagnetic signals in a receiver.
Implementation Method 2
applying a compound pulse of electromagnetic energy to the earth formation, the compound pulse having a shape to induce a predominately greater amount of current in the zone of investigation than in the another zone
Data Source
AI summary
A method for estimating a property of an earth formation in a zone of investigation, the earth formation having the zone of investigation and another zone, the method including: applying a compound pulse of electromagnetic energy to the earth formation, the compound pulse having a shape to induce a predominately greater amount of current in the zone of investigation than in the another zone, wherein the compound pulse includes a first pulse and a second pulse, the first pulse having an amplitude different from the amplitude of the second pulse; receiving a response of electromagnetic energy from the current induced by the compound pulse; and estimating the property from the response of electromagnetic energy.