Print this pageDiscovering 25 Million Barrels in a 25 Year Old Field: A Seismic Induced Facelift
FORSTHOFF, HARRY S.
The ability to discover substantial hydrocarbon reserves in a mature province such as on the Gulf of Mexico Shelf can be quite challenging. A logical place to explore is in and around existing oil and gas fields. Utilizing 3-D seismic data for redeveloping these "old" fields continues to evolve technically while offering high potential returns.
Profound impact was realized immediately from acquisition in late 1994 of a 3-D survey over a 25 year old offshore field where only 2-D was previously available. within 2 years, 3-D data interpretation and evaluation culminated in the identification of significant new potential, the drilling of 5 development wells and installation of a platform. An additional 5 wells are planned ultimately accounting for reserve additions of 25 MMBOE potential to a proven fault block within the field.
With renewed emphasis on understanding and reducing risk associated with development drilling, advancing seismic technology and innovative tactics have afforded Chevron the opportunity for improved performance in its "old" fields, both in drainage efficiencies and reduced development costs. Improved seismic resolution, better interpretation methods, and more accurate data manipulation are some of the key components. The investment in 3-D seismic has resulted in the recognition of new opportunities, improved drill locations to maximize recovery, more accurate estimates of hydrocarbon volume and recovery rates, and fewer development dry holes. Therefore, a project's economics are enhanced by optimizing hydrocarbon recovery while minimizing capital investments and operating expenses.