Technical Publications and Papers

Monarch Geophysical is pleased to offer the following sample Powerpoint files which illustrate some of the issues raised in the QC of datasets which we have investigated over the many years of managing projects.

Iterative Reprocessing: Imaging the Dentale formation offshore Gabon (2016 EAGE)

This paper showed how successive reprocessing campaigns using the latest technology combined with the increasing understanding of the geology and the velocity-depth model allowed significant image improvements to be obtained along with reducing well depth errors to <0.5%

New Broadband 3D Provides Clarity and Detail on a Complex Jurassic Play in the Netherlands (2016 PETEX)

This presentation shows how a detailed workflow using modern Broadband processing techniques along with precise correlation of the seismic and well data can enhance the temporal and spatial resolution of a lithologically and structurally complex area which has been studied for many years.

Reducing sub-salt uncertainty: A North Sea RTM case study (2013 EAGE)

This paper demonstrated that using state of the art depth migration techniques in complex salt areas results in a better understanding of the complex geology because well ties are enhanced while retaining a geologically plausible velocity model.

Sub-Basalt Imaging (2006 Faroe)

Imaging and multiple attenuation in areas of Basalt always presents a challenge. This paper describes the techniques used and shows the results of work done south of the Faroe Islands.

Processing of Dual Azimuth 3D Surveys (2005 EAGE)

This presentation follows on from the previous paper and shows the complexities of processing Dual Azimuth data where there is azimuthal anisotropy as well as vertical anisotropy. These data have to be processed in the depth domain with only one vertical velocity model.

Dual Azimuth 3D Acquisition (2004 PETEX)

In 2003 it was decided to try and improve the image of the Rotliegende under a major salt structure in the Southern North Sea. The paper discusses some of the operational issues and shows preliminary results.

Migration Operators (2004 EAGE)

Variation of the migration operator within three velocity fields; from a laterally invariant field with single Vz function, to a laterally variant field.

Anisotropic Prestack Depth Imaging Onshore Libya (2003 EAGE)

The initial thought was that this dataset would not benefit from PSDM, it being almost layer-cake geology, but with a Graben-type fault problem. Detailed anisotropic velocity analysis shows the improvement that can be made.

Derivation of Anisotropic Parameters for Pre-stack Depth Migration Using A Walkaway VSP (2002 EAGE)

The paper describes the derivation of the Thompson parameters using a VSP and then their validation with Seismic data. It shows the pitfalls of just using well derived data where there is no knowledge of the surrounding geology.

The Q4 Story (2000 PETEX)

First presented at the 2000 EAGE, this excellent paper focuses on a dataset from the Q4 block in the Dutch offshore, and shows the improvements that can be brought about by detailed velocity analysis for PreStack Depth Migration in a, geologically, very complex area.

Using 3D Pre-stack Depth Migration to Take a New Look at a Mature Area (2000 PETEX)

This paper covers a Pre-Stack depth migration study in a mature area of the Dutch North Sea. It shows the importance of interpretation data in the depth domain.

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