Well Control - Shallow Gas
Some areas are notorious for the presence of hydrostatically pressured gas pockets at relatively shallow depths.
1 Prediction of shallow gas
Although the location of gas pockets is difficult to predict, high resolution seismic data acquisition, processing and interpretation techniques increase the reliability of the shallow gas prognosis and therefore, surveys are to be recommended.
Well proposals should always include a statement on the probability of encountering shallow gas, even if no shallow gas is present. This statement should not only use the "shallow gas survey", but include an assessment drawn . . .