Mapping the Subsurface with PETREL

  • Duration: 5 Days
  • Date: 1 – 5 January 2023
  • Type:  Oman Institute for Oil & Gas Classroom, Muscat, Oman

The context of this course will take the student through the primary techniques of construction of 2D (two-dimensional) maps and sections of the subsurface, including integration of well data and key surfaces defining the framework of geologic units in the subsurface as the foundation of subsurface evaluation. These initial 2D techniques allow the interpreter to display the 3D (three-dimensional) relationships of geologic surfaces and any associated faults which are the key to defining the spatial and volumetric aspects of the associated subsurface resource. The geologic surface and fault relationships analyzed in this course will also be linked to the overall aspects of depositional settings and structural styles that are present within the global development of geologic terrains.

As part of an integrated cross-discipline subsurface evaluation team geologists, geophysicists, petroleum engineers, and drillers will utilize the techniques presented in this

course to interpret subsurface data and provide geological models that form the basis for development planning and resource optimization.

This course is primarily in two sections. The first section is over 3 days of analysis of traditional 2D mapping techniques. The second section extends the traditional 2D hand drawn techniques into a 2 day presentation of computer mapping processes.

  • Course code: GL-TC2-NXT17960
  • Sub-Discipline : Evaluation, Tools & Techniques
  • Discipline: Geology
  • Modality: Classroom
  • Course Level: Foundation Course
  • Duration: 5 Day

Course Objective

The context of this course will take the student through the primary techniques of construction of 2D (two dimensional) maps and sections of the subsurface, including integration well data and key surfaces defining the framework of geologic units in the subsurface as the foundation of subsurface evaluation. These initial 2D techniques allow the interpreter to display the 3D (three dimensional) relationships of geologic surfaces and any associated faults which are the key to defining the spatial and volumetric aspects of the associated subsurface resource. The geologic surface and fault relationships analyzed in this course will also be linked to the overall aspects of depositional settings and structural styles that are present within global development of geologic terrains.

As part of an integrated cross-discipline subsurface evaluation team geologists, geophysicists, petroleum engineers and drillers will utilize the techniques presented in this course to interpret subsurface data and provide geological models that form the basis for development planning and resource optimization.

This course is primarily in two sections. The first section is over 3 days of analysis of traditional 2D mapping techniques. The second section extends the traditional 2D hand drawn techniques into a 2 day presentation of computer mapping processes.

Topics Covered

  • Geological concepts, global tectonics of fault, and depositional surfaces
  • Planning, gathering, and management of geological data
  • Well log correlation
  • Mapping of reservoir parameters and structure
  • Integration of seismic data for horizons and fault surfaces
  • Structural styles, trapping conditions
  • Oil and gas volumetric calculations
  • Fault dimensions
  • Team practical exercises

Audience

  • Geologists, petroleum engineers and geophysicists involved with the development of oil and gas reservoirs.
  • Geologists needing knowledge of Correlation and Structural/Stratigraphic mapping

Prerequisite

A fundamental understanding of geologic concepts.

Petrel software application will be utilized in the course. While it is strongly suggested that you have taken the Introduction to Petrel Class, it is not a requirement.

Exercises using specific Petrel modules will be constructed so even the new Petrel user can work through the material

Activities

Day 1

  • Introduction
  • Course Objectives, History and Principles of Surface Mapping Across Structural Styles
  • Data Quality Issues and Impacts on Mapping
  • Contouring Rules and Techniques, Manual Computer Processes there Pluses and Minuses
  • Gridding Algorithms and Data-specific Mapping Evaluation: Comparison and Analysis of Gridding Technique results

Day 2

  • Wellbore Correlation of Vertical and Directional Drilling Data to Subsurface Feature Mapping
  • (optional) Petrel software primer
  • Well Correlation
  • Petrel Correlation
  • Hands on Mapping Exercises

Day 3

  • Seismic Interpretation Fundamentals for mapping
  • Surface Gridding
  • Surface editing
  • Rules and Techniques for Integrating Fault and Surface Maps
  • Hands on Mapping Exercises

Day 4

  • Introduction to Fault Mapping
  • Structural Modeling – Framework
  • Structural Modeling – Fault Framework
  • Structural Modeling – Gridding
  • Structural Modeling – Horizons and layers
  • Computer Mapping Exercise

Day 5

  • Isochore and Isopach processing
  • Mapo based volume calculations
  • Comparison of paper and computer mapping
  • Conclusions – team presentations of