USE OF AVO PROCESSING TECHNIQUES FOR SHALLOW GAS ASSESSMENT

The paper describes the interest of using AVO (amplitude versus offset) processing techniques in offshore drilling site surveys for shallow gas assessment. Presently, shallow gas evaluation is mostly based on the aspects of the amplitude anomalies of seismic reflectors. This practice is undoubtedly conservative as amplitude anomalies may not correspond to gas charged horizons; hence, the need to qualify seismic amplitude anomalies, in particular in environments where such anomalies are numerous. With this objective, AVO processing techniques enable discrimination of events which are gas charged or not. The paper presents results of HR surveys with map and seismic sections for which AVO techniques were used. Examples from Thailand, Tonking Gulf and Indonesia are presented, showing practical consequences for drilling site selection and drilling programs.

• Supplemental Notes:
  • OTC 91, 23rd Annual Offshore Technology Conf; 6-9 May 1991; Houston, Tx, USA. Procs. Vol 1, Ppr OTC 6533, p 297 [12 p, 1 ref, 16 fig]
• Authors:
  • Vallieres, T O
  • des Nicoletis, S A
  • Sullivan, M P
• Publication Date: 1991

Language

• English

Subject/Index Terms

• TRT Terms: Offshore drilling platforms; Offshore oil industry
• Old TRIS Terms: Gas exploration
• Subject Areas: Bridges and other structures; Marine Transportation;

Filing Info

• Accession Number: 00700973
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM