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- W2897635670 abstract "Summary When we carry out the time-lapse study of oil and gas reservoirs, the temporal change in near-surface layer by precipitation could cause large effects. We measured the time lapse of near-surface layer before and after the 22 mm rainfall in the test field. We used 100 m optical fibre and 4.5 Hz vertical geophones on the ground at every meter along 100 m line and a Mini-Vib by horizontal vibration. We ran the Mini-Vib every 30 min during daytime. The optical fibres were used as acoustic sensors as DAS. We made comparison of waveforms, phases and travel times in a) before rain, b) after the rain and c) before-after rain. The direct comparison of waveforms in a) and b) shows extremely small changes. Although the source locations were not exactly same, this was not large effect. The largest change was brought by precipitation. The before-and-after comparison revealed clear temporal change in waveforms, phases and travel times. The precipitation effects on body-waves and Rayleigh wave were less than 1ms faster and 15 ms (3%) slower than ones, respectively. This discrepancy between body waves and surface wave can be explained by the different paths." @default.
- W2897635670 created "2018-10-26" @default.
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- W2897635670 date "2018-06-11" @default.
- W2897635670 modified "2023-09-27" @default.
- W2897635670 title "Distinct Temporal Change of Waveforms Due to Precipitation Suggesting the Near-Surface Effect Revealed by a Dense-But-Sh" @default.
- W2897635670 doi "https://doi.org/10.3997/2214-4609.201801532" @default.
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