FIELD: oil and gas industry.
SUBSTANCE: method consists in measurements of amplitude values of a geophysical parameter along the axis of a cased string of the well and depth H, on which there detected are maximum amplitude values of the measured parameter, as per which depth of the gas-saturated formation is determined. In the well, under action of difference between formation and wellhead pressures, a gas flow of known velocity V is arranged and time distribution of amplitude values of gas humidity in the same flow is measured, and depth of the gas-saturated formation in the well is determined by the following formula: H=V·t, where t - time of occurrence of maximum at time distribution of humidity amplitude values.
EFFECT: simplifying technical implementation of the method due to eliminating the need for geophysical investigations of logging measurements.
2 cl, 2 dwg
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