Item talk:Q73846

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     "abstract": "Downhole log measurements such as acoustic or electrical\r\nresistivity logs are often used to estimate in situ gas\r\nhydrate concentrations in sediment pore space. Estimation\r\nerrors owing to uncertainties associated with downhole measurements\r\nand the parameters for estimation equations (weight\r\nin the acoustic method and Archie?s parameters in the resistivity\r\nmethod) are analyzed in order to assess the accuracy of\r\nestimation of gas hydrate concentration. Accurate downhole\r\nmeasurements are essential for accurate estimation of the gas\r\nhydrate concentrations in sediments, particularly at low gas\r\nhydrate concentrations and when using acoustic data. Estimation\r\nerrors owing to measurement errors, except the slowness\r\nerror, decrease as the gas hydrate concentration increases and\r\nas porosity increases. Estimation errors owing to uncertainty\r\nin the input parameters are small in the acoustic method and\r\nmay be signifi cant in the resistivity method at low gas hydrate\r\nconcentrations.",
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