# Applied Oilfield Geomechanics

 Instructor Dr Jorg Herwanger (MP Geomechanics) Duration 1 or 2 days Disciplines Petrophysics – Geomechanics Level Foundation Language English EurGeol 5 or 10 CPD points Keywords 4D SEISMIC   DISPLACEMENT   CALIBRATION   FAULT RE-ACTIVATION   MECHANICAL PROPERTIES   MUD WEIGHT   PORE PRESSURE   STRESS   STRAIN   WELLBORE STABILITY

This course is also offered as EET 5

### Introduction video

A short version of this course has been recorded as an E-Lecture. Watching this video will give you a clear introduction of what the course is about and it will help you to prepare yourself if you are going to attend it!

Click here to watch the E-Lecture 'One 4D geomechanical model- and its many applications'.

### Course description

3D geomechanical models are frequently used to assess the state of stress inside the Earth. Knowledge of the stress-state in a reservoir and the surrounding rock allows assessing the risk of reservoir compaction, wellbore failure, sanding, breach of seal integrity and fault re-activation amongst others. Three-dimensional seismic data and inversion models can be used in building geomechanical models and time-lapse (4D) seismic data provide a means of calibrating the dynamic behaviour of reservoir geomechanical models. The purpose of this course is to provide an overview of currently available workflows to build and run calibrated 3D and 4D geomechanical models, maximizing the use of seismic data.

By attending the course, participants will deepen their insight into each of the elements that comprise a 3D and 4D geomechanical model. Special attention is given to the way that seismic data assist in the process, what other data sources are required, how to calibrate geomechanical models and finally, how to interpret geomechanical models for a range of applications.

### Course objectives

The purpose of this course is to:

1. Provide an overview of the currently available techniques of building and calibrating 3D and 4D geomechanical models;
2. Demonstrate the interaction between rock properties, pore pressure and stress state;
3. Apply the knowledge of stress state from geomechanical models to field development and reservoir management;
4. Understand the limitations of current workflows and techniques and give a glimpse of the road ahead.

### Course outline

• Introduction: Applications of geomechanics in the oilfield life-cycle;
• Rock mechanical properties:
• Elastic and strength properties;
• How do you derive mechanical properties in practice.
• Stress and strain tensors:
• Workflow for building 3D and 4D geomechanical models;
• Calibration of 3D geomechanical models using well-centric 1D geomechanical models;
• Analysis and display of displacement vectors, strain tensors and stress tensors.
• Case studies:
• Building a 3D geomechanical model using seismic AVO inversion in an onshore tight gas reservoir;
• Geomechanical controls on hydraulic stimulation;
• Wellbore stability for inclined wells: Why inclined and horizontal wells behave differently from vertical wells;
• Multiple uses of 3D and 4D geomechanical flow models: Applications in a deepwater carbonate and clastic fields;
• Stress rotations during production and their impact on hydraulic stimulation.

### Participants' profile

Geomechanics projects integrate data and models from many different subsurface disciplines, including geophysics, rock mechanics testing, geology, geomodelling, rock physics and reservoir engineering. The course is designed for practising geoscientists and engineers and demonstrates how their discipline knowledge contributes to geomechanical modeling.

The course is also beneficial to students of petroleum geoscience (geophysics and geology). Finally, the course also appeals to managers of subsurface teams, increasing the appreciation of the complexity of the subsurface workflows that his or her team needs to address.

### Prerequisites

This course is aimed at geoscientists and engineers with an interest in geomechanics, be their background in geology, geophysics, rock physics, reservoir engineering or geomechanics. The course was developed mainly with a practicing geophysicist or geologist in mind. The course has an emphasis on making the physics behind the presented techniques accessible and clear and will appeal to curious and inquisitive people. This course is also suited for Master's and PhD students as the course (material) is designed in such a way that the principles of geomechanics become clear.

Geomechanics is still a relatively new discipline in the oilfield environment and is not taught as part of most university Geoscience-programs. Therefore a lot of graphic examples are included in the course material to aid intuitive understanding.

Jorg Herwanger is a Director at MPGeomechanics, a geomechanics consulting and software company he co-founded in July 2016. His work combines experimental observations and the development of mathematical models and workflows in seismic, rock physics and reservoir geomechanics. Working closely with clients and his team, he carries out 3D and 4D geomechanical projects, integrating 1D geomechanical models, seismic inversion methods, rock physics and pore pressure predictions into reservoir flow and geomechanical models. Previous companies he worked for included Ikon Science and Schlumberger. Before working in the upstream oil and gas industry, Jorg's interest was in the development and computer implementation of tomographic methods to determine anisotropic electrical properties from observed crosswell data. He combined these newly developed techniques with anisotropic velocity tomography to detect and evaluate fractures. Jorg is a member of EAGE, SPE and SEG. He served as an EAGE Distinguished Lecturer from 2007-2009, and EAGE Education Tour (EET-5) Lecturer in 2011-2012, and is currently the EAGE Education Officer on the EAGE Board. For the EET-5, Jorg wrote the eponymous book on “Seismic Geomechanics”. Jorg holds a Diplom degree from Technische Universitat Clausthal, Germany and a PhD from Imperial College, London, U.K., both in Geophysics

## Explore other courses under this discipline:

Geophysics Under Stress: Geomechanical Applications of Seismic and Borehole Acoustic Waves

Instructor: Dr Colin Sayers (Schlumberger)

The state of stress within the earth has a profound effect on the propagation of seismic and borehole acoustic waves, and this leads to many important applications of elastic waves for solving problems in petroleum geomechanics. The purpose of this course is to provide an overview of the sensitivity of elastic waves in the earth to the in-situ stress.

Applied Oilfield Geomechanics

Instructor: Dr Jorg Herwanger (MP Geomechanics)

Geomechanical models consist of (i) mechanical rock properties, (ii) pore pressure and (iii) stress state. Applications of geomechanical models in reservoir development and management include assessing mudweight windows for drilling, diagnosing wellbore failure, analysing conditions for breach of seal integrity and fault re-activation, evaluating fracture containment during hydraulic stimulation, and predicting reservoir compaction and overburden subsidence.
The purpose of this course is to provide an overview of currently available techniques to build calibrated 3D and 4D geomechanical models and apply these models for field development and management applications. By attending the course, participants will deepen their insight into each of the elements that comprise geomechanical models, and give guidance how to interpret geomechanical models for a range of applications.

Conduits and Seals in Hydrocarbon Reservoirs: A Geomechanical Approach

Instructor: Dr Dirk Nieuwland (NewTec International)

Flow of oil and gas through porous reservoir rock is controlled by the permeability of the reservoir. In the simplest case this is a single permeability system that is completely controlled by the rock properties of the reservoir. The presence of faults and/or fractures complicates the flow by creating a dual porosity/permeability system when open fractures are present, or by creating barriers to flow or even reservoir compartmentalization when sealing faults or fractures are present. In this short course the origin of faults and fractures and their mechanical properties will be discussed in a framework of geo-mechanics. Understanding the physical processes of fault and fracture formation enables the development of predictive models even in structurally complicated reservoirs. A combination of theory, case histories and exercises will be used to familiarize the participants of this short course with the subjects. The nature of a short course is such that an full in-depth treatment of the mechanics is not possible due to lack of time, the course emphasis will therefore be on informative case histories. Exercises will make part of the course but in view of the available time need to be relatively short.