Technical Content

We use a North Sea example to demonstrate that the use of geological constraints in this extended tomography allows improving the focusing of the seismic image and providing a more geologically plausible velocity model also below complex overburdens.

With the new broadband acquisitions, allowing to record frequencies down to 2,5 Hz, and the new tomographic tools, allowing to resolve for vertical velocity components up to 6 Hz, we have moved for velocity model building from the situation of a mid-frequency gap to ...

We present a method to enhance the bandwidth of seismic data in the continuous wavelet transform (CWT) domain. By utilizing the features of CWT in detecting time-variant frequency content and automatically designing band-dependent time window, we can enhance the seismic bandwidth mostly based on ...

This paper is an attempt to fill the technology gap existing between pure P- and PS-wave imaging. Full
wavefield extrapolation techniques are well developed for P-wave and RTM has been now available for
almost a decade. Conversely, ray based migration algorithms are still the ...

Least squares migration (LSM), like interpolation, has the potential to address sampling issues and generate images with better amplitudes than migration. Although both techniques share the same goal and often the same formulation, they differ on the nature of the model that is used ...

Variable-depth streamer acquisition has become a popular solution for marine seismic acquisition to obtain data with both low and high frequencies: the curved cable profile produces notch diversity that minimizes the residual ghosts in stacking and the deep towing nature provides high S/N at ...

Analysis of time-lapse data is performed on migrated seismic images, which represent the spatial and time-lapse variability of the medium’s reflectivity. The process of migration effectively rotates the wavelet so that it is normal to the imaged reflectors. Processes used in 4D reservoir analysis ...

We discuss the problem of creating low frequency models for inversion and suggest a simple facies trend-based method which reduces reliance on prior laterally-varying assumptions about the heterogeneity of native reservoir properties. In our example, we were able to identify key hydrocarbon-bearing facies from ...

A gas field, China, the target reservoirs are mainly delta front depositions, which are tight, thin, and below the tuning thickness. In order to charaterize the thin effective reservoir and porosity distribution in this field, a geostatistical inversion and co-simulation were performed. Using geostatistical ...