Conocophillips Company

Conoco Inc.

Robert T Baumel

Phil Dean Anno

Javaid Durrani

Jack H Cole

John S Gergely

Partha Sarathi Routh

Roger K Parsons

John E Strecker

Beverly Stebens

Donna K Terral

Matthew J Yedlin

A computer-implemented method of accounting for angle-dependent wavelet stretch in seismic data based on a novel relationship between wavelet stretch and the cosine of a reflection angle of an acoustic ray. Conventional seismic data having at least one wavelet, such as data generated from a reflection seismic survey, is accessed. The data is processed such that at least one wavelet is subject to angle-dependent wavelet stretch. A reflection angle for at least one wavelet is also determined. An operator is utilized to calculate a wavelet stretch factor for at least one wavelet based on the cosine of the corresponding reflection angle of the wavelet. The wavelet stretch factor is applied to the seismic data to account for angle-dependent wavelet stretch.

Method of accounting for wavelet stretch in seismic data

The present invention provides for a method and apparatus for seismic data processing. Prestack seismic data is obtained that contains a plurality of reflectors. Non-parallel moveout of the plurality of reflectors is utilized to determine a source wavelet using an L2-Norm and a reflectivity parameter using an L1-Norm. The source wavelet and reflectivity parameters can be determined simultaneously. Source and reflectivity determination may further comprise minimization of a model objective function. The model objective function may be a function of at least one of i) said source wavelet, ii) a gradient parameter and iii) an intercept parameter. An AVO intercept and gradient parameters can be determined using the determined source wavelet and reflectivity parameter. Constraints may be placed on parameters to ensure physically realistic solutions.

Simultaneous inversion for source wavelet and AVO parameters from prestack seismic data

The present invention relates to a method for generation of elliptically polarized shear waves in an earth medium using two shear wave vibrators engaged to the earth medium in cross-polarized attitude and driven at sweep rates having variable phase displacement.

Apparatus for inducing elliptically polarized shear waves in an earth

A method for developing a novel seismic data attribute enables improvements in seismic data processing and interpretation. Seismic signals or trace data are first rectified and then Hilbert transformed and processed with the arc tangent function to develop a new instantaneous phase parameter referred to as phase of rectified trace (PORT). Output data may be further enhanced with tri-modal, interactive color display.

Method of seismic data enhancement using a phase of rectified trace

Growing community of inventors

Ponca City, OK, United States of America

Robert T Baumel