Gravity and Magnetic Methods (GEOL-488)

DESCRIPTION AND OBJECTIVES

The aim of the course is to introduce various aspects of gravity and magnetic method and familiarize the student with them. The course is emphasizing the physical concepts of each method. A conceptual review of the governing laws gravity and magnetic methods will be provided. The course is intended to be a practical, hands-on, field-oriented course on the applications of gravity and magnetic methods to these problems. For each topic, the development will proceed from basic principles (theory) through methodology and applications, to case histories. Applications will be emphasized; theory will be kept to essentials. The basic principles and operational procedures of each method will be presented, along with discussions of where the method is and is not applicable. Case histories will be included to illustrate applications.

INTENDED LEARNING OUTCOMES

The student will be able to demonstrate an advanced understanding of the physical principles underpinning gravity and magnetic methods. Critically evaluate geophysical techniques, acquisition procedures, and survey designs for various subsurface targets. Process and analyses collected geophysical data. Employ appropriate modeling methodologies, and evaluate strengths, weaknesses, and limitations. Infer physical properties at depth and formulate geological interpretations from those properties.

COURSE CONTENTS

Physical principles and basic theory; instrumentation; planning of the survey and evaluation of errors; different survey methodologies; rock densities/rock susceptibilities and their measurements Isostasy; data acquisition, processing; interpretation and mapping to identify gravity/magnetic anomalies; regional fields and residual anomalies, derivatives, continuation of the field, two and three-dimensional modeling; applications in petroleum industry and case histories.

READINGS

1. Telford, W. M., Telford, W. M., Geldart, L. P., Sheriff, R. E., & Sheriff, R. E. (2012). Applied geophysics. Cambridge university press.

2. Reynolds, J. M. (2011). An introduction to applied and environmental geophysics. John Wiley & Sons.

COURSE SCHEDULE

Week	Topics and Readings	Books with Page No.
1	Physical principles and basic theory of Gravity Method	Book 1 Pages 6-10 Book 2 page 32-41
2	Gravity Instrumentation and planning of the gravity survey and evaluation of errors	Book 1 Page 19-22 Book 2 Pages 43-51
3	Rock densities and their measurements and Isostasy	Book 1 Page 11-18
4	Gravity data acquisition and processing;	Book 1 Page 23-27 Book 2 Pages 43-51
5	Data interpretation and mapping to identify gravity anomalies	Book 1 Page 26-27, 34-40 Book 2 Pages 52-62
6	Gravity ; regional fields, residual anomalies and derivatives	Book 1 Page 41-44 Book 2 Pages 62-72
7	Continuation of the gravity field and two and three-dimensional modeling;	Book 1 Page 45-47 Book 2 Pages 72-90
8	Applications in petroleum industry and case histories	Book 1 Page 48-59 Book 2 Pages 92-101
9	Physical principles and basic theory of Magnetic Method	Book 1 Page 62,63,66-73 Book 2 Pages 117-125
10	Magnetic Instrumentation and planning of the magnetic survey and evaluation of errors	Book 1 Page 75-84 Book 2 Pages 139-145
11	Rock susceptibilities and their measurements	Book 1 Page 85-104 Book 2 Pages 126-138
12	Magnetic data acquisition and processing;	Book 1 Page 106-111 Book 2 Pages 149-157
13	Data interpretation and mapping to identify magnetic anomalies	Book 1 Page 112-117 Book 2 Pages 158-166
14	Magnetic ; regional fields, residual anomalies and derivatives	Book 2 Pages 167-177
15	Continuation of the magnetic field and two and three-dimensional modeling;	Book 1 Page 111-113 Book 2 Pages 178-188
16	Applications in petroleum industry and case histories	Book 1 Page 114-123 Book 2 Pages 190-207