3-D seismic surveys are used in Occidental's producing and exploration operations to generate detailed three-dimensional images of underground structures, which geoscientists analyze to identify reservoir size, shape and depth, as well as porosity and fluid content.

Wide azimuth, high-density seismic surveys onshore and offshore enable Occidental's geoscientists to characterize the highly fractured carbonate reservoirs prevalent in the Middle East. Occidental is a leader in implementing this technology in the Arabian Gulf region.

Occidental geophysicists also use monitoring technologies to detect fluid changes in reservoirs. Occidental is conducting one of the largest 3-D vertical seismic profile (VSP) campaigns in the world. 3-D VSPs combine recording instruments in wells with surface seismic sources to produce local, high- resolution 3-D seismic volumes of the target reservoir, which can detect changes in fluid content. Monitoring fluid movement within oil and gas reservoirs can be critical to the efficient production of hydrocarbons from major fields.