1887

Abstract

Summary

The distributed acoustic sensing (DAS), as a novel type of receiver, has been increasingly used in seismic exploration due to its low cost, small trace interval, and wide frequency coverage. Since the DAS system records the axial strain rate along the optical fiber, conventional seismic imaging methods cannot be directly applied and usually require a complex transition between strain rate and particle velocity. To mitigate this issue, we present a direct imaging method for DAS data using a modified reverse-time migration (RTM) framework. First, we present a novel pressure and strain-rate acoustic wave equation for backward wavefield extrapolation. The DAS data are directly used as the boundary condition for this wave equation, which can automatically correct the incident-angle dependent effects of DAS records during wavefield extrapolation and thus does not require data transformation. As in conventional RTM, the extrapolated pressure wavefields are chosen for the zero-lag correlation imaging condition. To enhance weak energy at great depths, we apply both source- and receiver-side illuminations to compensate for deep image amplitudes. Numerical examples verify the feasibility of the proposed method and its adaptability for complex structures.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202510407
2025-06-02
2026-02-08

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/content/papers/10.3997/2214-4609.202510407
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Directly Imaging of DAS Data with Reverse-Time Migration Based on a Pressure and Strain-Rate Equation
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202510407
/content/papers/10.3997/2214-4609.202510407
/content/papers/10.3997/2214-4609.202510407
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