Log Quality Control and Petrophysics

Introduction

The certification of the acquired data is a very critical aspect of wireline logging. It is performed trough the observation of key quality indicators, the main objective of this training is to make all participants aware of these quality indicators as well as the different techniques to solve commonly found issues at the wellsite. This training is intended for oil industry professionals who needs to deal with wireline logs QA/QC in their daily job.

This training will explore the tools response explained from their physical principles as well as their relationship with the rock and fluid properties, most common open hole logging technologies will be covered explaining their main applications and limitations. Basic petrophysical interpretation will be discussed with numerous examples and exercises in order to complement the participants’ knowledge to be able to perform a proper log QA/QC analysis.

This LAKESHORE ISL training course will feature:

• Explanation of petrophysical concepts and techniques
• Discussions on tools physical principles, applications and QA/QC
• Tool limitations on different borehole environmentsa
• Metrology concepts and applications on wireline logs
• Multiple log quality control exercises

Objectives

By the end of this LAKESHORE ISL training course, participants will be able to:

• Understand the physical principles of main logging tools
• Apply quality control techniques to validate logging data
• Know the main applications and limitations of the different tool readings
• Perform a complete log quality control in a set of logs
• Perform a basic log interpretation

Training Methodology

This LAKESHORE ISL Log Quality Control and Petrophysics training course will utilise a variety of proven adult learning techniques to ensure maximum understanding, comprehension and retention of the information presented, the sessions will include visual, auditory and kinesthetic elements to cover the three different learning modalities. The daily sessions will be highly interactive and participative. This involves regular discussion of applications as well as hands-on exercises that will be solved manually and/or using Microsoft Excel.

Organisational Impact

The organization will benefit because:

• Having their personnel trained on log interpretation will help reduce human mistakes and improve efficiency
• Their personnel will be able to better assess data quality and integrity
• Their personnel motivation will increase as they understand better some critical data needed for their daily job

Personal Impact

Attendees will gain by participation in this LAKESHORE ISL training seminar as a result of:

• Obtaining a full understanding of logging tools principles and applications
• Learning the principles and key indicators for log quality assurance and quality control
• Learning basic and advanced methods and techniques for log interpretation

Who Should Attend?

This LAKESHORE ISL training course is suitable to a wide range of professionals but will greatly benefit:

• Engineers in exploration and production departments
• Geologists, geophysicist and petrophysicist
• Petroleum, reservoir and drilling engineers
• In general, all other oil & gas industry professionals who are involved in logging data QA/QC and validation

Seminar Outline

DAY 1

Basic Logging Concepts and Principles of Metrology

• Basic Well Logging Concepts
• Auxiliary Measurements, QA/QC and common issues
• Principles of Metrology – The Real Environment
• Log Quality Control Basic Principles
• Basic Measurements: Gamma Ray and Spontaneous Potential
• QA/QC Indicators and Examples
• Resistivity Theory, Principles and Applications of Laterologs
• Microresistivity Devices, Principles and Applications

DAY 2

Conductivity and Nuclear Logging Tools

• Conductivity Tools, Uses and Limitations
• Log Quality Control and Common Issues
• R_T and Invasion Profile Determination
• Formation Density Tools, Calibrations, Applications and QA/QC
• Neutron Tools Principles, Calibrations, Applications and QA/QC
• Nuclear Tools Limitations and Environmental Corrections

DAY 3

Acoustic and Geological Logging Tools

• Basic Sonic Tools, Borehole Compensation
• Dipole Sonic Tools, Applications
• Mechanical Properties Determination and Uses
• Sonic Limitations, QA/QC and common issues in the Borehole
• Cement Evaluation Logs:  CBL-VDL. Interpretation and QA/QC
• Ultrasonic Cement Evaluation Tools
• Dipmeter Interpretation Principles
• Geological Image (resistivity and ultrasonic) Logging Tools
• Principles, Interpretation and Log Quality Control Indicators
• Structural and Stratigraphic Interpretation Principles
• Facies Analysis for Reservoir Characterization with Image Logs

DAY 4

Advanced Logging Tools and Formation Testers

• Nuclear Magnetic Resonance, Applications, Limitations and QA/QC
• Relaxation Mechanisms and their association with Fluid and Rock Properties
• Porosity, Irreducible Water Saturation and Permeability Determination
• Advanced Fluid Determination Methods: 3D Map T1-T2-Difussion
• Dielectric Tools Principles and Applications
• Saturation Determination Parameters, m, n and CEC
• Geochemical Logging Tools, Uses, Limitations and QA/QC
• Reservoir Pressure Determination Tools
• Pre-test Interpretation, common issues and QA/QC
• Pressure Gradient Interpretation and Examples
• Fluid Sampling, Optical and Composition Fluid Analyzers
• Advanced Probes for Special Well and Reservoir Conditions
• Permeability Determination

DAY 5

Basic Petrophysics and Well Seismic

• Formation Evaluation Principles
• R_w Determination Methods
• Crossplots Utilization, Hingle and Pickett Plots
• Graphical Interpretation Techniques for Porosity and Lithology
• Saturation Determination Equations and Techniques
• Complete Formation Evaluation for Simple Lithology
• Checkshot, VSP, Offset and Multi-Offset VSP, Walkaway
• Different Source Types, Air-guns and Vibroseis Trucks
• Physical Principles, Interpretation and Log Quality Control Indicators