Schlumberger Technology Corporation

Westerngeco L.l.p.

Thomas Gehrmann

Lars Sonneland

Irina A Marin

Knut Steen Boge

Oyvind Yrke

Per-Ola Tennebo

Gunnar Berge

A workstation stores a novel seismic classification software package (known as the 'Seisclass software'). During execution of the Seisclass software by a processor of the workstation, the workstation processor will present a plurality of attribute data, describing the characteristics of a geological feature, simultaneously as 'attribute data sets' and as &#x201c;points in attribute space&#x201d;. Characteristic groupings and attribute dependencies can be detected, either automatically or with manual support using a-priori knowledge. Clusters, groups of data sharing particular characteristics, are classified, either automatically or with manual support. The classification result is presented as a &#x201c;class data set&#x201d; allowing the association of the attribute characteristics with data set positions. The type of attributes and their dependencies may allow a classification of a geological feature, such as a sub-surface, with respect to its reservoir properties, such reservoir properties including, for example, the possible existence of underground hydrocarbon deposits in an earth formation.

Method and apparatus for generating a cross plot in attribute space from a plurality of attribute data sets and generating a class data set from the cross plot

A method and apparatus for utilizing seismic data contemporaneously across multiple seismic domains is disclosed. The method comprises kinematically linking a first point in a set of seismic data having at least three-dimensions in a first seismic domain with a second point in the set of seismic data in a second seismic domain related to the first seismic domain by a velocity model in time or in depth. The apparatus includes, in various aspects, a program storage medium encoded with instructions that, when executed by a computer, perform such a method and a computer programmed to perform the method.

Method and apparatus for kinematically linking multiple seismic domains

A method for contemporaneously utilizing seismic data in the pre-stack seismic domain and the post-stack seismic domain is disclosed. The method includes initiating a higher order probe at a three-dimensional coordinate in a post-stack seismic volume; and instantiating a pre-stack seismic data content for the higher order probe. In alternative aspects, the invention includes a program storage medium encoded with instructions that, when executed by a computer, perform the method and a computer programmed to perform the method.

Method and apparatus for contemporaneous utilization of a higher order probe in pre-stack and post-stack seismic domains

A method is disclosed for characterizing the subsurface levels of the Earth with a greater degree of accuracy than hitherto. Seismic data samples are migrated and stacked, for example according to known techniques and then spectrum analyzed. The spectrum analysis is applied to a feature of the subsurface and, for example, a particular layer bounded by a pair of horizons would be subject to volume reflection spectral analysis. The analysis is carried out using an orthogonal base by defining the reflection signals in terms of coefficients to a set of orthogonal polynomials. Additional seismic characteristics or attributes may be directly calculated from the polynomial coefficients. These coefficients represent the characteristics of the layer to a high degree of accuracy and may be compared with spectra derived a priori (for example, synthetic spectra or previously characterized spectra) to further assist in analysis of measured seismic data.

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Hundvaag, Norway

Thomas Gehrmann