![Seismic well tie tutorial hampson russell](https://kumkoniak.com/26.jpg)
![seismic well tie tutorial hampson russell seismic well tie tutorial hampson russell](https://1.bp.blogspot.com/-eYFmi-X2EKU/VtFmigdb4nI/AAAAAAAABkQ/18ihYAn7SJ0/s1600/1438182017458.jpg)
Newrick, 2008, Strange but true stories of synthetic seismograms: CSEG Recorder, 12, December, 51–56. ISIJBC 0020-0255 Crossref Web of Science Google Scholar However, before looking at this process, called AVO, let us consider the more standard seismic process flow, which involves stacking the seismic data. The shot record is then transformed by processing into a common mid-point (CMP) gather, in which the reflection points are grouped around a common midpoint.Īs we will discuss in a later section of this tutorial, the information contained in a CMP gather contains information about all three physical parameters shown in Figure 2: P-wave velocity ( V P ), S-wave velocity ( V S ), and density ( ). Zoeppritz equations, which involve the solution of a 4x4 set of linear equations, allow us to compute the amplitudes of each of these waves.Īlthough we will not give the explicit form of the Zoeppritz equations here (see Aki and Richards, 2002, for the complete derivation) a linearized version of the equations will be discussed later in this tutorial. Zoeppritz (1919) showed mathematically that if a P-wave was incident on the boundary between two elastic media at an angle greater than zero degrees, reflected and transmitted P and S-waves were created by a process called mode conversion, as shown in Figure 2. These early theoretical studies recognized that both compressional waves (P-waves) and shear waves (S-waves) are generated in an elastic earth (along with many other types of waves, such as Rayleigh waves, Love waves, Stonely waves, etc). Seismic amplitude alone is therefore a fairly good indicator that something in the subsurface is anomalous (porosity, hydrocarbon, etc), but is an ambiguous indicator of hydrocarbons. Notice that all three of these wells correlate with amplitude anomaly trends (shown by the brown colour on the map), but only two of the wells are producing gas wells.Īlmost due east of the A1 well are two deviated wells also containing gas but this is not evident from the seismic amplitudes. Well A5 is the downdip delineation well, and encountered no gas sand and 140 ft (33 m) of porous water sand at the reservoir level. Well A6 is the updip delineation well, and encountered 80 ft (25 m) of gas sand and over 60 ft (20 m) of water sand at the reservoir level. Well A1 is the initial discovery well, and encountered 150 ft (40 m) of gas at the reservoir level. This information could be correlated with porosity changes, lithology changes, or even fluid changes within the subsurface of the earth.įor example, Figure 1 shows an extracted seismic amplitude map from a recent 3D survey over the Marlin field from the Gulf of Mexico. However, by the 1970s, geophysicists had begun to realize that information was contained in the amplitudes of the seismic reflections themselves. This article presents both a history of seismic inversion and an overview of the techniques themselves, illustrated by a case study from the Gulf of Mexico. We have now progressed to the point where inversion for P-impedance, S-impedance and density is feasible.
#SEISMIC WELL TIE TUTORIAL HAMPSON RUSSELL FULL#
To perform a less ambiguous interpretation of our inversion results, we must perform full elastic inversion, in which we estimate P-impedance, S-impedance (the product of density and S-wave velocity) and density. Hampson Russell Tutorial Full Elastic Inversion Hampson Russell Tutorial Full Elastic Inversion.
![Seismic well tie tutorial hampson russell](https://kumkoniak.com/26.jpg)