Petroleum System Study Field Development Plans Reservoir Characterization Reservoir Engineering E&P Acreage Evaluation
Gravity and Magnetic Modeling 2D/3D Seismic Interpretation Structural Modeling Geological Interpretation Volumetrics and Ranking Petrophysics Structure Restoration Fault Seal Analysis
Biostratigraphy Core Description Cyclo-Sequence Stratigraphy Sedimentology
Log & Map Digitizing Seismic Vectorization Composite Logs Drafting
Short Courses On Job Training Field Trips
NeuraLog WellCAD Geodes Lithotect RokDoc
Preface Clients ListCareers Contact Us

Advanced Rock Physics To Support Quantitative Seismic Interpretation
(Advanced Level)

Course & Workshop

November 22-26, 2020

Instructor : Dr. Ahmed Abdel Karim


Petrophysicists, Geoscientists, Petroleum Engineers, reservoir or drilling engineer oil & gas industry professional who is involved in logging data interpretation and validation. You must have already basic knowledge in using open hole logs and seismic interpretation.


This course is the deep level of the introduction of Rock Physics for support quantitative Seismic interpretation (Intermediate level) focuses on the construction and application of models in seismic amplitude interpretation and through this promotes the understanding of the essential aspects of rock physics that are relevant in interpreting all types of seismic displays (including reflectivity, impedance and AVO data, inversion).

Learning Outcomes Participants will learn to:

  • Employ simplifications to the Zoeppritz equations and understand why they are useful in describing variation of amplitude with offset and how they are used in seismic modelling and interpretation.
  • Categorise AVO responses.
  • Appreciate how various rock property factors (such as lithology and fluid fill) affect the contrasts in acoustic properties that give rise to seismic signatures.
  • Construct simple single-interface amplitude-versus-angle models and determine first order effects to look for on various seismic displays.
  • Employ basic AVO interpretation: 1) knowing that an understanding of phase and polarity is critical to successful interpretation and 2) recognising that changes in fluid may give rise to dim spots, bright spots or phase reversals.
  • Calculate the vertical resolution of seismic data.
  • Recognise the importance of calibration of seismic to well data, including the issues involved in upscaling log data to the seismic scale, and appreciate the importance of understanding accuracy in well ties.
  • Recognise the data sources used for building seismic models and understand the basics behind the application of rock physics models in fluid and lithology substitution.
  • Apply Gassmann's equation to evaluate the effect of changing fluids on acoustic properties.
  • Comprehend the basics of seismic inversion and the potential pitfalls.
  • Understand the basics behind the various approaches to AVO analysis:
    • conventional 2 term reflectivity interpretation
    • elastic inversion
    • physics-driven trace matching.
  • Construct an AVO projection designed to optimise changes in fluid fill.
  • Appreciate the issues involved in Prospect Risking and understand the need for systematic analysis of both geological and geophysical factors.
  • Appreciate the principles of seismic acquisition and processing needed to achieve 'AVO friendly' seismic data.. The course comprises a mixture of lectures and practical exercises.

Course Objective:

At the end of the course the participant will be able to create an order of reflectivity models and understand the basics and advanced behind the buzzwords (AVO, EI etc) but also to ask pertinent questions that relate to the use of seismic data in prospect risking and inversion. Lecture review topics include: advanced rock properties and reflectivity The mechanics of seismic data processing (Geometry, Stacking and Migration) An advanced to key processing issues Seismic bandwidth and the convolutional model Wavelets - phase and polarity Resolution - sections and maps Trying wells to seismic The concept of trace inversion to acoustic impedance Seismic data and the AVO plot The rock physics advanced of AVO. The elements of seismic modelling Rock physics - where to get the numbers for modelling Understanding real rocks - the key to rock physics modelling Applying Rock Physics in Exploration (models and risk) Useful checklists for amplitude interpretation Practical exercises include: Creating models of various AVO scenarios Predicting the expected responses for various types of seismic display Modelling fluid parameters and the effects of fluids and lithology on rock properties Investigating the issues behind the use of log data for seismic models. Designed For:

The course is aimed as an advanced to application of rock physics application in seismic interpretation and would be of interest to all working experience geoscientists including geologists, geophysicists, petrophysicists

The course is designed for all experience geoscientists including geologists, geophysicists, Petrophysicists and QI Rock Physicist who wish to understand the advanced of interpreting seismic data using rock physics models and gain awareness of how this may impact the perception of risk in exploration and production drilling. Attendees will receive a fully documented manual with text discussion, including all illustrations shown in the course. The course is a combination of lectures and practical exercises - there is minimum five years previous experience of the package is required and preferably attended a foundation level of Rock Physics and QI course.

Course Content include: Part 1

  • Introduction
  • Fundamentals
  • Wave propagation
  • Seismic basics
  • Rocks are isotropic and elastic
  • The convolution model
  • Modelling seismic reflectivity
  • What is the wavelet?
  • What do the trough and peak present?
  • Reflection, refraction and mode conversion
  • Single interface model - the simplest and most important seismic model:
  • Amplitude varing with angle (AVA)
  • Other seismic models
  • Amplitude varing with offset AVO response description
  • Exercises

Part 2
  • How can we Qc the tool measurements of Key logs Vp, Vs ( Sonic) & Density?
  • Why the Sonic log need processing? How the measurement made by the tool? And converted to slowness?
  • SLB example of STC semblance processing
  • Why the Sonic Scanner SLB is an advantage in the current industry?
  • Sonic Scanner & DSI transducers frequencies
  • Depth of investigation of different sonic measurements with frequency dependence
  • QC Sonic data
  • How the measurement made by the Density tool?
  • QC density data
  • Qc and Preparation of the data for Rock Physics.
  • Guidelines for well editing and QC
  • The effect of pore geometry and rock fabric
  • Elastic Bounds:
  • Distinction between cementing and sorting trends
  • Missing log predication
  • Log prediction and Correction
  • Effect of Geology on Rock physics
  • Examples of Xplot Editing, QC analysis and RP trends
  • Exercise

Part 3
  • Fluid Substitution Analysis
  • The importance of P & S Sonic for Fluid sub. & AVO Modelling.
  • Gassmann Fluid Substitution
  • Understanding the theory.
  • Theory and Synopsis.
  • Basic Fluid Substitution- Gassmann's equation & Work Flow
  • Gassmann assumption and pitfalls with Shaly Sand rocks. (LPS London Petrophysical Society paper - Ahmed Abdelkarim)
  • 4 well Examples in Details from Varies Basins
  • Density correction for mud filtrate invasion
  • Why we are doing this density Correction to mud filtrate invasion?
  • Theory
  • Workflow
  • Practical examples test in WBM consolidated/ unconsolidated
  • Conclusion Pros and cons
  • Conclusion of Day 3
  • Exercise

Part 4
  • Conceptual workflow for forward modelling and inversion
  • QI calibration processes for rock physics and seismic modelling
  • Petrophysical input To QI modelling processes
  • Well Tie Process
  • Synthetic generation
    • What do the trough and peak present?
    • How to obtain the wavelet
  • Well Tie approaches using synthetics
  • How long is the wavelet optimum length?
  • 5 examples of synthetic to well Tie
  • Key Conclusion and Observation
  • Exercise of QAQC the time/depth data with velocity interval
  • Case History: what-if scenarios answered using wedge models and fluid substitution.

Part 5:
  • Conceptual Workflow for forward Modelling and inversion
  • Comparison between Forward Modelling and Inversion
  • Seismic Inversion Benefits
  • Seismic Inversion Examples around the world
  • Seismic Inversion in the Frequency Domain. Low frequency model to get absolute impedances
  • Increase resolution by adding using Stochastic Inversion
  • Types of Seismic Inversion
  • Relative Impedance
  • Coloured Inversion
  • Deterministic Inversion
  • Stochastic Inversion
    • Pre-Inversion Checklist
    • Typical Inversion Provider
    • Typical Stage in Funnel
    • Pre-Stack/Post-Stack Inversion Decision Tree
    • Relative/Deterministic/Stochastic Inversion Decision Tree
    • Seismic Inversion: Summary

Course Wrap up
  • Conclusion and discussion, Key Messages


First day will be held at Holiday Inn (Former Sofitel Hotel), in Cairo. The participants will fly the next day to Hurghada. The course will be continued in Hurghada.


Inclusive of refreshment and lunch at the Holiday Inn (Former Sofitel Hotel). Air Ticket Cairo/Hurghada return and accommodation in Hurghada.


Ahmed Abdelkarim is currently a Senior Consultant Petrophysicist specialized in HPHT wells, petrophysics, QI and Rock Physics technical training courses for the oil and gas companies.

Also provide the Tuition for the faculty of Science, Cairo university, Petroleum Geoscience program, introduction to well logging , Formation Evaluation and Petrophysics, Advanced Petrophysics and well correlation for Year 2,3,4 and graduation projects.

Also providing petrophysical, rock physics studies, well onshore/ offshore operations support ( Shallow/ Deep/ HPHT) as well as the technical training courses in a number of petroleum societies.

Ahmed has solid experience of working nationally and internationally, he has held different senior Technical positions last permanent position was Consultant Petrophysicist for North Africa (BG Egypt, Tunisia) and Aphrodite Project (Cyprus), and Subject matter Expert of LWD/WL Acoustic Tools, Rock Physics and QI. Ahmed has robust experience in HPHT, Rock Physics analysis, Rock Properties, QI for AVO modelling and seismic attribute, gained from working on different basins around the world for different countries as Brazil, Trinidad & Tobago, Australia, North Sea UK, Norway, Egypt, Tunisia and Tanzania. Ahmed also has significant experience in analysing well log data, and performing integrated evaluations for clastics and Carbonate, Planning, Execution of Extreme HPHT wells with different service contractors including the latest high technology LWD/WL tools. Ahmed working with Shell Egypt, BG UK, Egypt, Tunisia, Aphrodite (Cyprus) with 28 years of experience in Oil and Gas industry Ahmed is an active member of LPS, SPE and SPWLA.

  • Professional Petrophysicist with 28 years of experience, employed with various multinational oil and gas companies such as BG Group (UK head office, Egypt, Tunisia) and Shell a number of roles in exploration and development with both onshore and offshore experience.
  • Strong HSSE background including regulations and compliance, Contractor inspection and Audit.
  • Mastery of global group technical authority of LWD/WL acoustic tools, QAQC Sonic Processing for latest technology acoustic tools.
  • High experience in planning and executing extreme HPHT wells with different service contractors including the latest high technology LWD/WL tools in Egypt and UK.
  • Robust experience in Rock Physics analysis, Rock Properties, QI for AVO modelling and seismic attribute.
  • Significant experience in analysing well log data, and performing integrated evaluations for Clastics and Carbonate reservoir for exploration, development and appraisal wells including SCAL analysis, Core log integration, Saturation height function, NMR and thin beds interpretation, using Low Resistivity Pay.
  • Solid background in project initiation notes (PIN),field development plans (FDP), new opportunities, bid rounds, farm in/out,
  • High communication, negotiation, project and time management skills
  • Latest paper was presented in 2015 in SPWLA 56 Th Symposium at USA, Long Beach California on QAQC Acoustic log and processing.

Areas of Expertise
  • Acoustic Tools (GTA)
  • Analysing Well Log Data
  • Field Development Plan (FDP) Study
  • HPHT Wells
  • Clastics and Carbonate Reservoir
  • Rock physics & QI
  • NMR and Thin Beds
  • Exploration, Development and Appraisal Wells

  • QAQC ACOUSTIC LOG AND PROCESSING (Ahmed Abdelkarim 1 And Tim Pritchard 2) SPWLA 56th Annual Logging Symposium, July 2015
  • QAQC Acoustic Log and Processing, Integrated and Enhanced Workflows BG Group Subsurface Technical Forum -Twickenham-UK October 2013
  • Solving Shaly Sand Fluid Substitution Pitfalls Using An Adaptive Gassmann's Model Shear Magic: The applications of full waveform acoustic logging LPS One Day Seminar (London Petrophysics Society)- March 2013