Patent ID: 6157195
Filing Date: 2000-12-05
Classification: G01V,Y02A

Abstract:
A method to quantitatively determine the combined amount of oil and gas adjacent to a steel pipe in a geological formation characterized by having a resistivity, a porosity, and a salinity of salt water present comprising the steps of using information obtained from measurements of the resistivity of the geological formation that are obtained from within a steel pipe located in said geological formation in combination with using information obtained from measurement from within the steel pipe of the porosity of the formation and using information obtained from the measurement from within the steel pipe of the salinity of any salt water present in the formation as steps in a process to quantitatively determine the combined amount of oil and gas present adjacent to said steel pipe in the geological formation, whereby said measurements of the resistivity of the geological formation are determined by passing A.C. electrical current from within the cased well to the adjacent geological formation, whereby the frequency of said A.C. current is within the frequency range of 0.1 Hz to 20 Hz.