Abstract:
OMV Pakistan operated Miano gas field is located in District Sukkur of Sindh Province - Pakistan and was discovered in 1993, (Fig. 1). The main reservoirs in this field are, the Lower Goru Sands, having thickness of between 5m and 10m, and pinchout up-dip to north and northwest and form structural-cum-stratigraphic traps.
During exploration phases, 3D surface seismic was acquired in the area but the resolution of seismic data is in the order of 25 - 30 m. Conversely, 3D was unable to resolve reservoir sands of 5 - 10 m thicknesses. Even conventional VSPs would not be able to delineate these reservoir sands because they require higher order of frequencies to resolve their thicknesses.
Vibroseis, a seismic energy source, is a nonlinear system and as a result generates energy at higher multiples of the frequency, harmonics, along with the signal at the intended frequency. This higher frequency harmonics content is usually disregarded in conventional vertical seismic profile (VSP) processing. In this case study we have established that this higher frequency content can be recovered as signal to enhance the seismic resolution in order to resolve the target sands of 5 to 10m in Miano field, if uncorrelated raw waveforms are used in deconvolution process.
Page(s):
293-300
DOI:
DOI not available
Published:
Journal: Proceedings SPE-PAPG Annual Technical Conference, Volume: 0, Issue: 0, Year: 2011