A Low Frequency Seismic Survey in an Exploration Environment

Spectraseis and PETRONAS acquired a low frequency (LF) passive seismic survey over a producing field and a series of leads and prospects in south-Asia. Efficient field operations and close coordination among all involved parties provided a good quality dataset with minimal environmental impact and HSE exposure in only 9 days of recording. Despite the presence of high levels of noise from exploitation activities and interference from a strong near surface effect, detailed analysis and careful processing returned results that are reliable and consistent. The LF results show a good correlation to well results, with both productive and dry areas correctly identified. The survey also extended over undrilled prospects. Good quality results over the known areas extends the usefulness of the survey, adding information to the body of geophysical and geological knowledge for ranking further exploration and appraisal prospects in the area.