Michel Krief
Seismic Petrophysicist at Krief Models- Claim this Profile
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Bio
Vimal Saxena
Michel Krief, known in Rock Physics for his famous Krief models, is an acoustic petrophysics genius and a true professional. He has the unique ability to integrate and view petrophysics through acoustic insight. He has great experience and expertise in carbonate as well as clastics. I had the opportunity to adopt his classic rock physics characterization work in middle-east during my tenure there. I was also privileged to work with him on an Elsevier book we wrote together. His current plan, to repurpose legacy acoustic log data for classical geophysical studies (and also petrophysical, geomechanical studies) as valid inputs in modern Machine Learning applications, is of great value to the acoustics and the general petrophysics world.
Hussain Najwani
Michel's experience combines academic and business aspects of petrophysics. His wide experience is helpful in acquiring and evaluating log data in addition to analysing density and sonic logs for advance geophysical studies. The later places Michel in a special category.
Vimal Saxena
Michel Krief, known in Rock Physics for his famous Krief models, is an acoustic petrophysics genius and a true professional. He has the unique ability to integrate and view petrophysics through acoustic insight. He has great experience and expertise in carbonate as well as clastics. I had the opportunity to adopt his classic rock physics characterization work in middle-east during my tenure there. I was also privileged to work with him on an Elsevier book we wrote together. His current plan, to repurpose legacy acoustic log data for classical geophysical studies (and also petrophysical, geomechanical studies) as valid inputs in modern Machine Learning applications, is of great value to the acoustics and the general petrophysics world.
Hussain Najwani
Michel's experience combines academic and business aspects of petrophysics. His wide experience is helpful in acquiring and evaluating log data in addition to analysing density and sonic logs for advance geophysical studies. The later places Michel in a special category.
Vimal Saxena
Michel Krief, known in Rock Physics for his famous Krief models, is an acoustic petrophysics genius and a true professional. He has the unique ability to integrate and view petrophysics through acoustic insight. He has great experience and expertise in carbonate as well as clastics. I had the opportunity to adopt his classic rock physics characterization work in middle-east during my tenure there. I was also privileged to work with him on an Elsevier book we wrote together. His current plan, to repurpose legacy acoustic log data for classical geophysical studies (and also petrophysical, geomechanical studies) as valid inputs in modern Machine Learning applications, is of great value to the acoustics and the general petrophysics world.
Hussain Najwani
Michel's experience combines academic and business aspects of petrophysics. His wide experience is helpful in acquiring and evaluating log data in addition to analysing density and sonic logs for advance geophysical studies. The later places Michel in a special category.
Vimal Saxena
Michel Krief, known in Rock Physics for his famous Krief models, is an acoustic petrophysics genius and a true professional. He has the unique ability to integrate and view petrophysics through acoustic insight. He has great experience and expertise in carbonate as well as clastics. I had the opportunity to adopt his classic rock physics characterization work in middle-east during my tenure there. I was also privileged to work with him on an Elsevier book we wrote together. His current plan, to repurpose legacy acoustic log data for classical geophysical studies (and also petrophysical, geomechanical studies) as valid inputs in modern Machine Learning applications, is of great value to the acoustics and the general petrophysics world.
Hussain Najwani
Michel's experience combines academic and business aspects of petrophysics. His wide experience is helpful in acquiring and evaluating log data in addition to analysing density and sonic logs for advance geophysical studies. The later places Michel in a special category.
Credentials
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DigiActJul, 2022- Nov, 2024
Experience
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Krief Models
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France
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Oil and Gas
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1 - 100 Employee
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Seismic Petrophysicist
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May 2017 - Present
Acoustic logs (density, sonic, shear sonic) are used for lithology and rock facies characterization in addition to porosity, saturation, and permeability (matrix limestone).The understanding of the velocities of compressional and shear waveforms is essential to the proper modeling of acoustic & elastic properties of rocks.The BGK model (my version of the Biot & Gassmann low frequency models) is a simple model that fits this purpose.
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Consultant Petrophysicist
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May 2017 - Present
A seasoned Petrophysicist working from home or on site depending on your needs. I can help you solve database problems (e.g. QC and repair of stored acoustic data).My knowledge of legacy tools (I started as a logging engineer in 1975) can be put to good use for database and/or interpretive problem solving.
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Senior Petrophysicist
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Aug 2016 - Apr 2017
Petrophysics - Standard and expert petrophysical data analysisRock Physics - Acoustic and elastic rock properties, from QC to interpretation and modelingBiot-Gassmann-Krief model (BGK model)- A model for improving the integration of Geophysics, Geomechanics and Petrophysics in a single coherent framework.- A generic Rock Physics model, based on Biot and Gassmann coefficients, that handles separately, but in a consistent manner, the observed changes of dynamic bulk and shear moduli. Two parameters are used (Biot-Krief exponent, Gassmann-Krief exponent) that are extracted from measured sonic and shear sonic logs. The two exponents may be correlated to physical properties of the rock formation (for example: pore aspect ratio in consolidated rocks, matrix permeability).- Toolkits exist for acoustic logs QC, edit, interpretation: TECHLOG 2016.2 (Python scripts), GEOLOG 6.7 (Loglan modules). Similar toolkits may be developed on other software platforms.Co-author of the Handbook of Borehole Acoustics and Rock Physics for Reservoir Characterization, (Vimal Saxena (main author) and Ludmila Adam, Elsevier Ed. 2018).
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Storengy - ENGIE
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France
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Oil and Gas
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500 - 600 Employee
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Consultant Petrophysicist
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Jun 2018 - Jul 2019
- Jaf Field (Veracruz, Mexico) - Review of petrophysical data in view of setting up a gas storage operation for CENAGAS (state operator). Upper Miocene turbiditic sequence. - Gas storage Beynes Profond (Yvelines, France) - Review of petrophysical data in preparation of a field-wide facies analysis. Creation of a new log database (Techlog). Log interpretation of the Sequanian sand reservoir (Upper Jurassic, Oxfordian) in a few key wells. - Jaf Field (Veracruz, Mexico) - Review of petrophysical data in view of setting up a gas storage operation for CENAGAS (state operator). Upper Miocene turbiditic sequence. - Gas storage Beynes Profond (Yvelines, France) - Review of petrophysical data in preparation of a field-wide facies analysis. Creation of a new log database (Techlog). Log interpretation of the Sequanian sand reservoir (Upper Jurassic, Oxfordian) in a few key wells.
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OMV
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Austria
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Utilities
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700 & Above Employee
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Senior Petrophysicist
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May 2014 - Jul 2016
Senior Petrophysicist role to strengthen the Formation Evaluation team’s expertise in the assessment of carbonate and fractured reservoirs and contribute significantly to the interdisciplinary rock-physics activities in quantitative interpretation, fluid-substitution and poro-elastic modeling (using the BGK model) within the Petroleum Engineering function. - UK - West of Shetlands Cambo field - unconsolidated sands interbedded with coal, volcanics basement with hydrocarbon shows - Norway - SW Barents Sea Wisting field - Stø Formation - unconsolidated sands - 2 studies to resolve mismatch between log-derived and seismic-derived acoustic properties (AVO): study of possible gas-hydrate effect on acoustic properties & study of uplift effect on acoustic properties - Tunisia Ashtart field - carbonate reservoir - acoustic properties - Pakistan Miano field - clastics acoustic properties - Others: Austria, Romania (offshore & onshore), New Zealand, Namibia
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Maersk Oil
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Denmark
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Oil and Gas
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700 & Above Employee
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Senior Petrophysicist
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Oct 2007 - Apr 2014
Al Shaheen field (Qatar), Shuaiba/Nahr Umr Team- Al Shaheen field development (FDP) including Shuaiba reservoir (carbonate) and Nahr Umr reservoir (unconsolidated sands) - Static model update using log evaluations, acoustic / elastic properties, from vertical and horizontal wells.Carbonate reservoirs (Cretaceous)- Log interpretation (multimineral analysis MULTIMIN, electrofacies analysis FACIMAGE, acoustic log analysis (BGK model))- Kharaib, Shuaiba, Mauddud, Khatiyah, SulaiyCarbonate reservoirs (Jurassic)- Log interpretation (multimineral analysis, electrofacies analysis, acoustic log analysis)- Hith: oil-bearing dolomite stringers- Arab: oil-bearing mixed calcite/dolomite/anhydrite formationClastics reservoirs (Cretaceous)- Log interpretation- Nahr Umr Sand: thin (<5´) iron-bearing sand layer with variable matrix density (iron-bearing minerals); used combined electrofacies analysis and multi-mineral analysis for reservoir sands characterization.- Log evaluation (Wireline and LWD)- Wireline: exploration & appraisal wells (old & recent)- Electrofacies analysis (Facimage), multimineral analysis (Multimin).- Sonic quick-look interpretation (BGK model).- Permeability estimation of limestone matrix rocks from sonic-derived Biot coefficient value- LWD: development horizontal wells (typically RAB/ADN & RAB/ECO tools)- Image logs (resistivity, bulk density); spectroscopy data analysis.Acoustics / Rock Physics / Geomechanics- Acoustic / elastic properties database.- Editing / interpretation of acoustic logs (compressional sonic, shear sonic, bulk density).- Pre-fracturing job mechanical properties analysis.- Rock physics modeling of all Cretaceous carbonate reservoirs (modelling using the BGK model).Software- Geolog (Loglan modules)- Techlog (Python scripts, XML).
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Consultant Petrophysicist (Ipedex-Spie)
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Jun 2007 - Sep 2007
Awali field FDP (Bahrain)- Log evaluation of deep carbonate reservoirs (Arab, Khuff).- Log evaluation of shallow tar / heavy oil formation (Aruma).
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ENGIE
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France
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Utilities
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700 & Above Employee
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Consultant Petrophysicist (Ipedex-Spie)
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Mar 2007 - May 2007
Iran Gas Round 2007 - Log evaluation of the log data package (onshore gas fields). Iran Gas Round 2007 - Log evaluation of the log data package (onshore gas fields).
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PEMEX
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Mexico
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Oil and Gas
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700 & Above Employee
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Consultant Petrophysicist (Paradigm Geophysical)
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Oct 2006 - Nov 2006
Pemex - Activo integrado Burgos - Petrophysical support to the Paradigm G&G team. Pemex - Activo integrado Burgos - Petrophysical support to the Paradigm G&G team.
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PDVSA Petróleos de Venezuela S.A.
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Venezuela
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Oil and Gas
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700 & Above Employee
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Consultant Petrophysicist (Beicip-Franlab)
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Nov 2005 - Sep 2006
Distrito Norte de Monagas - Campo Santa Bárbara - Pirital - Review of the petrophysical model of the Santa Bárbara gas field (core data acquisition (Archie n-parameter change with time; permeability-pore throat size relationship; general parameterization of Pitmann's equations), saturation evaluation (incoherent and overly optimistic evaluations using a unique formation water resistivity value; possible use of spontaneous potential SP log in oil-base mud environment (!); alternate method for formation fluid identification),
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Petroleum Development Oman
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Oman
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Oil and Gas
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700 & Above Employee
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Senior Acoustic Petrophysicist
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Nov 2002 - Nov 2005
Reservoir characterization team (Exploration/Geophysics Quantitative Interpretation group) - Creation and maintenance of a new acoustic log database (500+ wells). - Processing (using BGK model) of some 2000 wells with sonic logs. - Acoustic and petrophysical support to PDO's geologists and geophysicists. - Support to Oman 2005 bid round Quantitative Interpretation (QI) projects - Saih Nihayda Field Amin deep tight sandstone gas reservoir; identification of 1 extra Tcf in finely laminated sand on top of the main reservoir. - Al Noor Field, Al Shomou Field Review of acoustic properties of Athel silicylites. - Shuaiba Formation Review of acoustic properties of all Shuaiba fields (Cretaceous carbonates) in North Oman resulting in the creation of an atlas of rock properties. - Harweel Cluster Review of acoustic properties of the dolomite stringers (oil and gas-bearing) in the Ara salt; study of salt and bitumen plugging. - Fahud Field QC of all acoustic data leading to reprocessing of all wells in the field. - Mukhaizna Field Heavy oil field Static model generation (petrophysics). - Yibal Field Modelling of missing bulk density and sonic logs across the Natih (carbonate), Nahr Umr (shale), and Shuaiba (carbonate) formations.
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CGG
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France
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Technology, Information and Internet
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700 & Above Employee
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Acoustic Petrophysicist
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Oct 1999 - Nov 2002
Seconded to Petroleum Development Oman (PDO) Exploration/Geophysics Department- Exploration, Reservoir characterization team (Tasks: see position above).
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FE Software (Log Analysis) Specialist
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Jan 1990 - Oct 1999
Petrophysical analysis software development, maintenance, and support (IntegralPlus software suite, DIALOG/LAM log interpretation package)DIALOG/LAM- User support, training, software maintenance- Software maintenance (petrophysical applications written mostly in FORTRAN, some in C)- Software development (XCORREC Xmotif-based application for simultaneous correction of all logs in a data-base (RDBMS based)).GEOLOG 6- Implementation of new and maintenance of existing algorithms (GEOLOG 6 software due to replace DIALOG software).Short assignments: training & log interpretation- Mexico - Poza Rica, Veracruz (log interpretation)- Venezuela - Maracaibo (DIALOG training)- Indonesia - Jakarta (DIALOG training)- China - Karamay, Xinjiang (training of Karamay Oil Company (KOC) geoscientists)
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Petrophysicist
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Aug 1988 - Dec 1989
EVA development team (full-waveform sonic development sponsored by ELF)- Interpretation of acoustic log data (using DIALOG, ELF proprietary FE software).- Development of new methods for sonic log interpretation (published paper in The Log Analyst, 1990).
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Copgo-Hunting
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France (Evry/Pau), Italy (Pescara)
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Production Logging Engineer
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Nov 1984 - Sep 1987
Cased hole operations: Cement Bond Log (CBL), Perforations, Explosive devices, Production logging (PLT). - Evry, France Production logging in geothermal wells of the Paris Basin (oil and geothermal wells). - Pau, France Production logging, perforation jobs - Pescara, Italy Operations in North Italy (Po Basin) and South Italy (Puglia, Basilicata, Calabria). Cased hole operations: Cement Bond Log (CBL), Perforations, Explosive devices, Production logging (PLT). - Evry, France Production logging in geothermal wells of the Paris Basin (oil and geothermal wells). - Pau, France Production logging, perforation jobs - Pescara, Italy Operations in North Italy (Po Basin) and South Italy (Puglia, Basilicata, Calabria).
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SLB
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United States
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Technology, Information and Internet
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700 & Above Employee
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General Field Engineer
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Mar 1975 - May 1983
Log analyst (October 1982 - May 1983) - Venezuela: Caracas Log Interpretation Center (multi-mineral analysis using GLOBAL) - France: Log Analyst School in Montrouge Schlumberger Interpretation Center General field engineer Field operations - Open-hole logging, cased-hole logging, production logging, perforation jobs France - Orléans: Paris Basin (including geothermal wells) + Brittany offshore (exploration) - Pau: Aquitaine Basin + Bay of Biscay offshore (exploration) Algeria - Mereksen oil field and Alrar gas field - Hassi Messaoud oil field, Gassi Touil gas field - Teguentour exploration wells (gas) (north of Ain Salah) - Adrar/Erg Chech, Timimoun areas exploration - Hassi R'mel gas condensate field - Inauguration of the Repeat Formation Tester (RFT) service in Algeria; setting resistivity rules for water / gas / tight zones identification; confirmation (sampling) of the presence of dry gas in deep, tight sandstone formations of the Teguentour field Gabon - Port Gentil offshore and onshore (Mayumba discovery) operations - Production Logging specialist (PLT, TDT) Short assignments - Zaire (Cabinda offshore), Norway (Ekofisk), Denmark (offshore)
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Education
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1967 - 1972
INSA Lyon - Institut National des Sciences Appliquées de Lyon
Engineer, Physics -
1983 - 1984
IAE FRANCE - Écoles Universitaires de Management
CAAE, Business administration -
2018 - 2018
Stanford University
Reservoir Geomechanics -
2019 - 2019
Stanford University
Unconventional Reservoirs Geomechanics
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