Interwell

Analyze post, pre stack and 4D seismic data, compute multi cubes seismic wavelet calibrated at wells and build a priori seismic impedance cubes honoring wells and stratigraphic data. Generating acoustic and/or elastic properties volumes to be used for inferring reservoir properties (lithologies, porosity and fluid content). Compute IP/IS/RHO absolute and relative uncertainties.

Interwell

Analyze post, pre stack and 4D seismic data, compute multi cubes seismic wavelet calibrated at wells and build a priori seismic impedance cubes honoring wells and stratigraphic data. Generating acoustic and/or elastic properties volumes to be used for inferring reservoir properties (lithologies, porosity and fluid content). Compute IP/IS/RHO absolute and relative uncertainties.

Seismic inversion and characterization

Seismic characterization is a key processed in today's oil and gas industry to perform evaluation, geological modeling and reservoir characterization for Oil and Gas Company's exploration, appraisal and development drilling program. Such process has even become of the utmost importance, since the era of easy oil has come to an end.

In such context, IFP group has pioneered the development of inversion software and characterization methods since the mid 80's with the InterWell product.

InterWell propose a unique workflow designed to analyze and pre processed the seismic data, produce accurate seismic wavelet calibrated at wells, model the impedances in the whole volume  through geological data including wells and structural and stratigraphic data and finally computes the optimal impedances by an inversion process which allows weighting  the seismic and the geological data according to their respective quality.

interwell

interwell

interwell

interwell

InterWell offers a unique workflow for acoustic, elastic and 4D joint inversion

Build upon the extensive IFPen Group experience for seismic inversion, InterWell 2012 offers a unified workflowin  4 main steps:

Seismic data QC and conditioning

  • Statistics
  • Seismic quality (N/S ratio, Seismic bandwdidth)
  • Sub stacks vertical time misalignments correction using a volumetric correction method keeping controls of amplitude accuracy
  • Horizons management (including picking, gridding, smoothing...)

Multi Well and Multi cubes wavelet estimation

  • Hybrid (combined deterministic and statistical) method for wavelet estimation using a multi-well, multi-trace calibration. This method ensure the best match between synthetics calculated at wells and neighboring seismic traces.

Initial Acoustic/Elastic parameters models creation

  • Based on a stationary or un-stationary (using seismic velocities) interpolation of well log data according to the stratigraphy.

Acoustic/Elastic Inversion

  • Based on a unified Bayesian formalism for both 3D and 4D inversion,  the algorithm is a multi channel grid based joint inversion with a priori information. It takes into account the interpreted structures and stratigraphy in the optimization process. It offers also the unique capability to manage inter-bed multiples.
  • Inversion algorithm is optimized for HPC performances

InterWell is considered a key process as the seismic inversion is commonly used for:

  • Matrix properties estimation (lithologies, porosity and fluid content)
  • Fault and Fracture networks detection and characterization
  • Understanding the field dynamic behavior using 4D inversion
  • Detecting prospective zones
  • Designing well trajectories and geosteering using connectivity analysis
  • Detecting sweet spots
  • Inferring geomechanical parameters before drilling
  • Assess inversion uncertainties and propagate them throughout reservoir property prediction

Success Story

Predicting matrix geological parameters in carbonates environment

In the Bull Hanine field (offshore Qatar), considerable heterogeneities in hard well data have been observed  and the inter well distribution of petrophysical properties will suffer in the absence of additional control. Reservoir properties information was extracted from optimally reprocessed 3D seismic data using Pre stack elastic inversion to produce lithology, lithology probability and porosity. 

The results from petro elastic studies on well data show that acoustic and elastic impedances could be used to discriminate lithologies: Calcite, Dolomite and Anhydrite.  A pre stack inversion has been  thus conducted prior to a 3D discriminant analysis to produce dominant lithology and associated probability volumes. 

During a following geo-statistical modeling, these volumes have been used as co simulation parameters for porosity distribution resulting in a high resolution static model of the reservoir. 

Fault and Fractures mapping in clastic reservoirs (Saudi Arabia)

A seismic amplitude inversion using inter-bed multiples management has been performed to improve the S/N ratio of the original seismic data in order to be used as input for a Fracture seismic facies analysis.  

It has been demonstrated that the azimuth of lineation picked on the seismic facies maps is consistent with the azimuth of dominant faults and fractures picked on image logs. Some inconsistencies were successfully explained by the seismic ability to pick up the conjugate pair of the pattern revealed by the image logs. This consistency in interpretation made from data with scale of measurement at least one order of magnitude apart, adds weight to the argument that features observed at a small scale are repeatable at a larger scale. This consistency strengthens the interpretation of each set of Fractures/Faults.

The use of the inter-bed multiples management to produce reflectivity volumes with a significantly reduced noises removes ambiguities from the seismic facies map interpretation.

These factors combine to put us in a better position to use the facies map to develop the field.

Requirements

Operating system

Hardware

  • Linux RH5 (32and 64 bits)
  • Compatibility Linux RH6
  • OpenMotif 32 bits package
  • OpenGL
  • CPU of 2 GHz or more
  • 2Gb free disk space (InterWell installation)
  • 4 Gb memory or more
  • 3D Graphic board (Type: NVIDIA Quadro FX1800)
  • Network card (for license) 

Key benefits

  • Versatility : Applicable in both clastic and carbonates environment.
  • Productivity : Multi wells, multi cubes wavelet estimation
  • Simplicity : Unique workflow for all types of inversion (post/pre stack, 4D)
  • Quality : Ability to weight the influence of the seismic and the geology in the inversion process, ability to take into account the presence of inter bed multiples reflection in the observed data
  • Efficiency : Uncertainties quantification without running numerous simulation.
  • Performance : Specifically designed for HPC performances.

 

InterWell 2013 features

 

New Wavelet Estimation module

 

  • Now fully ported into our new platform, this module if fully compliant with the InterWell user's interface allowing for more flexibility and productivity.

 

EasyTrace - InterWell direct link

 

  • Processed well data can be retrieved directly from an EasyTrace database.
  • Data extracted from InterWell results can be directly loaded into EasyTrace for further analysis and processing.

 

 

News

EasyTrace 2013.3 is now available!

18/12/2013

It combines new features from the 2013 release, improvements (import facilities, TOC estimation, electrofacies) and bugs corrections. More

InterWell 2013 : Now Available

08/08/2013

Beicip-Franlab is proud to announce the release of InterWell 2013 More

OpenFlow Suite 2013 has been released!

23/07/2013

Beicip-Franlab is delighted to bring to the market its new synchronized OpenFlow Suite 2013 software release. More

EasyTrace 2012 now released !

20/09/2012

Learn about Easytrace 2012 new features and download the release. More