METHODS FOR CALCULATING TIME CHANGES TO DETECT MATERIAL CHANGES IN PETROLEUM STRUCTURES DURING PETROLEUM PRODUCTION ACTIVITIES, AND TO DETERMINE OR DETECT A CHANGE IN A GEOPHYSICAL PROPERTY OF A SUBTERRANEAN REGION, AND, APPARATUS

摘要

Methods for calculating time changes to detect material changes in oil -containing strata during oil production activities, and for determining or detecting a change in a geophysical property of an underground region, and, device the invention is a method For reflection time -changing correspondence of a first and a second set of seismic reflection data (1 o, 30),Comprising first and second traces of seismic reflection (1, 3) with series of generically corresponding seismic reflections (11, 31). The first and second seismic data sets (10, 30) are acquired with a time separation extending over months or years. The second seismic data set (30) comprises at least one series extending laterally (40) of new seismic events (4) not present in the first seismic data set (10). Changes in reflection time (22) are calculated as required forEqualize seismic reflections (31) of the second reflections (3) of the second seismic reflection data (11) of the first reflections traits (2). The calculated time changes are conducted in said second reflective traits (3). The time changes (22) calculations are made by calculating the coefficients of the base function estimates.