A Study on Reconstruction of De‐Aliased Uneven Seismic Data

Abstract

Seismic data spatial trace interpolation is one of the most important issues in seismic data processing. In this paper, a novel Fourier transform based algorithm is proposed, which can reconstruct both uneven and aliased seismic data. We formulate band‐limited data reconstruction as a minimum norm least squares inverse problem where an adaptive DFT‐weighted norm regularization term is used. The inverse problem is solved by the preconditioned conjugate gradient algorithm, which makes the solutions stable and convergence quick. Based on the assumption that local seismic data are consisted of finite linear events, from the sampling theorem, aliased events can be attenuated via LS weighting prediction linearly from low frequency. Three application cases are discussed on even gap trace interpolation, uneven gap filling and high frequency trace reconstruction from low frequency data traces constrained by a few high frequency traces. Both synthetic and real data numerical examples show that the proposed method is valid, efficient and applicable. This research is valuable to seismic data regularization and cross well seismic exploration.

Test Study on the Resisting Shear Strengthening Effect with External Pre-Stressed Wire Rope

“…In order to ensure the structural safety, the resisting shear strengthening is particularly prominent. Now at home and abroad the main methods for the shear strengthening of reinforced concrete bridges are carbon fiber reinforcement [1][2][3], bonded steel plate reinforcement [4][5] and pre-stressed high-strength steel wire reinforcement [6][7] and so on, but each method has advantages and disadvantages. Shear strengthening with external pre-stressed wire rope [8] is a new strengthening technology, which has good reinforced effect, and simple operation and low cost.…”

The Ultimate Shear Bearing Capacity of RC Beam Strengthened with SWR External Prestressing under Dead Load Level when Strengthening

“…Now, the main methods for the shear strengthening of reinforced concrete structures are Carbon fiber reinforcement, bonded steel plate reinforcement and reinforcement mortar [1][2][3] and so on at home and abroad. The strengthening with externally prestressed steel wire rope is a kind of new technology [4]. It changes the traditional passive reinforcement, and it takes initiative prestressing force.…”

Study on the Method for Calculating Shear Strength of RC Beams Strengthened with Externally Prestressed Wire Rope

“…Due to innate deletion, acquired damage, enhancement of design code and alteration of function, shear capacity of some reinforced concrete structures is insufficient, so it need to be strengthed. Now at home and abroad the main methods for the shear strengthening of reinforced concrete structures are Carbon fiber reinforcement [1][2][3], bonded steel plate reinforcement [4][5] and ferrocement mortar [6] and so on. With externally prestressed wire rope units strengthening RC beams is a kind of new technology [7], it changes the traditional passive reinforcement, while strengthens beams with initiative prestressing force.…”