• Class and Course

    Non-Seismic Geophysical Methods

    Seismic data has been the main stay of geophysical interpretation. With Quantitative Interpretation it became clear that seismic mainly shows us one aspect of the subsurface, namely changes in acoustic impedance. This was sufficient for structural interpretation but in the oil and gas industry we are interested in the fluid content of the (reservoir) rocks. From the behaviour of the reflection amplitude with source-receiver offset we can under favourable circumstances also get an idea of the pore-fluids. But complementary data can be found in potential field (gravity and magnetic) and electromagnetic (the oldest exploration tool) measurements. Especially using Controlled Source Marine Electro-Magnetic methods can we measure the reservoir resistivity directly, a direct indicator that it could contain hydrocarbons. On land in remote areas the Magneto-Telluric Method is an efficient exploration tool. However, none of these methods will solve all problems, but in combining them we gain more than just the sum of the individual benefits.

    Day 1


    • Introduction to Geophysical Methods

    • The role of Non-Seismic Methods in the E& P business

    • Gravity Surveying

    • Determination of contour map anomalies

    • Calculation of gravity responses

    • Determination of Gravity resolution of bodies, anticlines and faults

    • Depth estimation methods: Half-width, Gradient-amplitude

    • Exercises on paper and using computer software

    Day 2

    Magnetics and Electrical Methods

    • Introduction to Magnetic and Electrical methods

    • Gravity and Magnetic signatures

    • (Poisson’s) Relationship between Gravity and Magnetic responses

    • Electrical surveying methods

    • Calculations of resistivity profiles, effective resistivity

    • Exercises on paper and using computer software

    Day 3

    Electro-Magnetics (EM)

    • EM: diffusion or wave-propagation ?

    • Land EM: TEM surveying

    • MT: surveying & modelling

    • Marine EM:CSEM surveying

    • Calculations of E refraction, MT resolution, EM skin depth & velocity

    • Exercises on paper and using computer software

    Day 4

    CSEM Inversion

    • EM Terminology

    • Exercises: CSEM Scripps Modelling: 3 layers

    • Exercises: CSEM Scripps Modelling: 5 layers

    • Joint Inversion TE & TM, CSEM & MT, Gravity & AMT & MT

    Day 5

    Time-Lapse & Joint Inversion

    • Time-Lapse Gravity & Electrical Methods

    • Introduction to Machine Learning

    • Machine Learning Applications in non-Seismic Geophysics

    • How much to spend on new acquisition & Processing


    Geo-scientists, who need to plan multi-geophysical-data acquisition and who need to decide on which data should be acquired for exploration, appraisal and interpretation. Interpreters who need to combine the information contained in the various data sets: seismic, potential field (gravity and magnetic) and electrical and electromagnetic data.

    Emphasis in the course will be on active participation in discussions and interaction between participants and with the course instructor. Participants will be divided into teams. Each team in turn will give a summary of the main learning points of the day and discuss questions raised by the other participants. The non-seismic methods will be applied in exercises, partly paper-based and partly computer-based, to enhance the learning. Also, videos will be shown illustrating the methods. Machine learning for rock classification based on non-seismic measurements will be part of the course.

    Awareness of the exploration and appraisal phases in the search for hydrocarbons and some knowledge of seismic acquisition, processing and interpretation.


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