Improved method for characterizing oil or gas reservoir evolution over time
A technology for reservoir characterization, applied in seismic signal processing and other directions, which can solve problems such as limiting the effectiveness of reservoir engineers
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[0054] first reference Figure 2a and Figure 2b , shows a reservoir, generally indicated by reference numeral 10 , containing hydrocarbons 12 in the subsurface 14 . A sonar transmitter 18 and receiver array 20 are located on a survey vessel 16 , which is the source of sound, and which surveys by navigating over the reservoir 10 . The first or initial survey ( Figure 2a ) can be referred to as a base survey and is usually carried out during the exploration phase before production begins.
[0055] A base survey of the reservoir 10 provides a collection of seismic traces at a first time T. For a given seismic trace, the base survey provides the amplitude b(t) as a function of time t; where, with the value t i The set (i is the index) samples the digitally recorded and digitally processed traces; a typical trace length corresponds to about 1000 samples. Then, the seismic traces are processed as values b(t i ) or b i collection.
[0056] To extract hydrocarbons 12, one ...
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