Things that change with time
This section lists and "flags" those reservoir properties that may change with time and result in seismic differences. It also gives insight into the typical extent of the changes that may be experienced. A later section covers predicting possible seismic changes.
During the hydrocarbon extraction process, those primary reservoir properties that change with time include:
Secondary effects of hydrocarbon extraction include compaction, porosity, density, overburden stress, fracturing and chemical changes.
Figures & Tables
“This book, prepared for use with the first SEG / EAGE Distinguished Instructor Short Course, discusses Â"time-lapse seismicÂ" and enables geoscientists to assess the value and risk of this new technology. It covers the rationale and driving forces behind time-lapse seismic by examining the limitations of existing methods of tracking fluid flow between wells. It examines those reservoir properties that change with time and what can be observed on seismic data over elapsed time. The repeatability of seismic data and the use of Â"legacyÂ" data sets are discussed, along with a review of the seismic data acquisition schemes and data processing requirements for time-lapse analysis. The rock-physics foundation for data analysis and interpretation options also are described. A selection of industry case histories illustrates many of these points. The reader will gain an understanding of key success factors, key calibration requirements, and key uncertainties of time-lapse seismic in reservoir management.”