It has been said that a good definition first throws the thing to be defined into a very large pool (i.e. a very broad category) and then pulls it out again (i.e. describes the unique characteristics that differentiate it from the other members of that category). That is the approach we will use in tackling the question; "What, exactly, is the Fourier series?" <...>

Explicit modelling in geological modelling is essentially akin to an engineering drawing process. The modeller defines geological structures such as veins and faults by explicitly drawing them on regularly spaced sections and joining them. The data may be used by the modeller to constrain where they draw, and there may be tools to accelerate the process, but fundamentally it is a process of drawing. This suits the engineering world where an exact definition of a structure is a precursor to its construction.

Any attempt to summarize 25 years of exploration for petroleum in the UK sector of the North Sea must be a daunting task. The outcome, in terms of the oil and gas fields discovered, is the subject of this volume. This introduction will attempt to outline, very briefly, some of the ups and downs of the exploration history which has led the industry to where it stands today, 25 years on (Fig. 1). <...>

A kick has been taken, the well shut in, and it’s been many months since your last well control school. What do you do now? The following criteria should be used as a guideline for developing a well kill plan and discussed with both field and office personnel before initiating well kill circulation. Operational policy or bridging document may dictate type of well control method to be employed  <...>