By James Smolen Ph. D.
Presents the practising petroleum engineer with diagnostic info to optimize restoration or plan workover operations. James Smolen is an the world over famous specialist in cased gap logging with greater than twenty years of oil adventure. DLC: Oil good logging.
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Extra resources for Cased Hole and Production Log Evaluation
The termination surfaces that are highlighted by the method correspond well to the surfaces that may be determined by a tedious manual interpretation done on the seismic cross section. 5 Discontinuities and Faults Enhancing faults means enhancing discontinuities in the seismic data. This is, however, not straightforward, as the intersections between the diﬀerent reﬂection layers constitute great amplitude changes. Hence, we need to enhance changes along the reﬂection layers and not orthogonal to them.
T. Chen (1994) System and Signal Analysis. Saunders College Publishing. 6. D. Gabor (1946) Theory of communication. J. Inst Elect. Engr. 93, 429–457. 7. K. Jain (1989) Fundamentals of Digital Image Processing. Prentice-Hall. 8. K. Jain and F. Farrokhnia (1991) Unsupervised texture segmentation using Gabor ﬁlters. Pattern Recognition 24(12), 1167–1186. 9. V. Kovalev, M. Petrou, and Y. Bondar (1999) Texture anisotropy in 3-d images. IEEE Transactions on Image Processing 8(3), 346–360. 10. I. Pedersen, T.
For the azimuth cube, yellow/green indicates that the layers are dipping to the right, whereas pink indicate layers dipping to the left. yielding a localized covariance matrix, C(t1 , t2 , t3 ), at each sample position. The window function, w(s) = w(τ1 , τ2 , τ3 ), will typically be a low-pass ﬁlter. An implication of the windowing function is a smoothing of the dip and azimuth estimate. We have had good experience using a Gaussian low-pass ﬁlter, 2 1 τ 1 τ2 τ3 1 √ w(τ1 , τ2 , τ3 ) = exp − , 2 σ1 σ2 σ3 σ1 σ2 σ3 2π for the window function, allowing us to easily adjust the noise sensitivity versus the resolution, and at the same time obtain joint optimum time-frequency resolution .