Elektromagnetisk målesystem og fremgangsmåte som kombinerer målinger fra overflate og borebrønner til bestemmelse av fluidegenskaper for undergrunnsformasjoner

摘要

A method for monitoring a reservoir (12). The method includes making a first set of electromagnetic measurements (30) at locations (22, 26) along the Earth's surface, making a first measurement from at least one sensor disposed proximate the reservoir in a wellbore (18) and determining an initial Earth model (34) from the first electromagnetic and first sensor measurements. The initial Earth model includes a fluid contact (15). At selected times (36, 34A), the sensor and electromagnetic measurements are repeated and a spatial distribution of the fluid contact is determined (38) from the repeated measurements.