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Abstract

Summary

Conventional normalized differential energy (NDE) is used to identify fractures through a borehole compensated energy loss estimation, which is obtained by averaging NDE values of two basic modes, the receiver array (RX) and transmitter array (TX). Although it is useful for mitigating borehole rugosity and coupling effects, numerical stability and data nonstationarity challenges remain unresolved. Additionally, the best way to integrate NDE estimates of the two modes (RX and TX) remains a challenge. For this reason, we propose a number of improvements from a nonstationary inversion perspective to stabilize numerical calculations and exploit the nonstationary nature of the data. All the proposed methodologies are illustrated with applications to a far-monopole, low-frequency Stoneley wave dataset acquired across a sandstone reservoir. As a result of the improved methodologies, data from the two modes (RX and TX) are better aligned and a more reliable fracture analysis result is obtained by quantifying residual differences of NDE values in terms of local similarity. Additionally, near-wellbore fracture evaluation using the improved NDE method correlates well with borehole image log results.

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/content/papers/10.3997/2214-4609.201800786
2018-06-11
2024-04-24

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References

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High-Resolution Fracture Evaluation Using an Improved Normalized Differential Energy (NDE) Method
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201800786
/content/papers/10.3997/2214-4609.201800786
/content/papers/10.3997/2214-4609.201800786
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