Technical Content

In ocean bottom acquisition, receiver side deghosting is normally done by summing together the hydrophone P and geophone Z data. A prerequisite for this method to work effectively is the precise calibration of geophones to hydrophones, so as to compensate for the differences in ...

Low frequency information is required for quantitative reservoir characterization. Because borehole measurements are often (laterally) sparse and preferential towards reservoir locations, there is much uncertainty on the low frequency models away from well control. Methods to improve the reliability of the low frequency data ...

Migration Velocity Analysis in the subsurface-domain measures velocity errors via (extended) image-domain residuals with respect to an ideal reference image and then updates the velocity model in order to minimize those residuals.Because of the similarity between images with similar extension parameter (shot number, offset ...

In 4D land and especially for Permanent Reservoir Monitoring (PRM), changes of the subsurface induce unwanted signal variations that interfere with the 4D signal recorded from the reservoir. A three-month PRM pilot was carried out for Shell on the Peace River heavy oil field ...

In 4D seismic, the velocity model used for imaging and reservoir characterization can change over calendar time as the reservoir is produced. This is particularly true for heavy-oil reservoir produced by steam simulation (EOR). We propose an automatic 4D update of the 3D velocity ...

A new methodology is presented for building near-surface static corrections models consisting on multi-physics measurements integration. The methodology was applied in two geological contexts: presence of a complex, multi-layered sandy overburden on Kahlouche area, and important weathered zone fluctuations due to shallow complex geology ...

The oil-bearing fractured granite basement rocks are a very important and complicated hydrocarbon reservoir in offshore Vietnam. In this paper, we present a case study of improving the fracture imaging in the Cuu Long Basin offshore Vietnam through Broadband technology, which not only provide ...

Model-based water-layer demultiple (MWD) is an effective method for attenuating water-layer-related multiples (WLRMs), especially in shallow water environments. Regular 3D MWD use regularized common-offset cubes for both shot- and receiver-side multiples. We propose a selective-input adaptation of the regular 3D MWD workflow that uses ...

Blended acquisition of ocean bottom node (OBN) surveys may provide important time savings when the survey duration is tightly constrained. We present a method that focuses on the deblending of OBN data recording two simultaneous sources in the Gulf of Mexico. By knowing the ...