Patent ID: 7423930
Filing Date: 2008-09-09
Classification: G01V

Abstract:
1. A method of taking measurements relating to a subterranean formation, comprising: receiving at least one waveform including a component signal of interest portion; determining the model order of an autoregressive model using Bayesian Information Criterion; determining a maximum likelihood function, based on the coefficients of the autoregressive model, within the signal of interest portion; determining a statistical function comprising the maximum likelihood function based on the coefficients of the autoregressive model; determining a point along the waveform using the statistical function; generating a single, fixed window containing first arrival of the signal of interest based only on the received waveform; determining the point of the first arrival within the generated window; outputting a position of the first arrival of the signal of interest, wherein the measurements taken are logging measurements relating to subterranean hydrocarbon reservoirs.