TECHNOLOGY APPLIED TO SITES: Acoustic Impedance Inversion The inversion of seismic data to acoustic impedance is a geophysical technique emerged as 'theoretical and experimental problem' in the early 80's. In 25 years of development, this technology has positioned itself as an innovative and powerful tool in reservoir characterization. Its boom is mainly due to the ability and exceptional versatility of the mathematical algorithms and computers available today, the added value it provides in understanding the sites and the ease and accuracy in interpretation.
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| Figure 1: Sequence of the replication process 'model of the earth' |
The acoustic impedance is an intrinsic property of the rocks and is defined as the product of the density of basement rocks and the speed of sound waves as they propagate through them. Every rock, according to its mineralogical composition and fluid content, has an acoustic impedance more or less distinct. However, the difference in acoustic impedance in the basement rocks a contrast between them that by introducing an acoustic signal (wavelet) in the basement, through the activation of a sonic energy source, these impedance contrasts produce reflections (all known as seismic reflection) that are representative of the interfaces between the rocks. You could say that the acoustic impedances of the rocks are 'masked' in the seismic data and, through the process of 'investment' of seismic reflection data, recover individual impedances of rock layers through extraction of the seismic component or wavelet which characterize this site being studied more closely. (Figure 1)
From: http://www.petroleum.com.ve/revista/articulos.php?id=536
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