Block 404   Target Finders first project in Algeria.....

Our involvement in Block 404 started in 1995 with a feasibility study for the first of Anadarko Algeria's 3D surveys, over the HBNS field. This was largely unknown territory for 3D surveys at the time, and posed an interesting combination of logistical and technical challenges. Fortunately there was a large database of 2D seismic, VSP, log and uphole data in the area, which provided much insight into the seismic mechanisms. These data were used in conjunction with elastic modelling to evaluate the likely performance of different 3D geometries.

The HBNS 3D was acquired in 96/97, and two more 3D surveys were later shot in the same area. We supervised the contractor processing of these surveys in London from late '96 to early '98. This provided our first real example of how 3D geometry can shape the coherent noise into a regular spatial pattern,  which led to the development of our adaptive footprint filter. We applied this process to the Hassi Berkine 3D surveys, together with spectral balancing and dephasing using data from 14 wells.

In addition to the surface seismic activity, we reprocessed, interpreted and analysed the log and VSP data over the Hassi Berkine Fields . An offset source VSP was designed and acquired to evaluate the shear content of the seismic data and to aid in AVO and reservoir studies. A total of eleven technical reports were produced over a period of three years, charting the progress of seismic technology in the area from 2D exploration to 3D reservoir characterisation.

The 3D surveys described in this page were operated by Anadarko Algeria Corporation.

  Target Finders