Integrated geophysical exploration in onshore frontier basins

• Published in: Geophysical Prospecting 2019-07, Vol.67 (6), p.1664-1675
• Main Authors: Martini, F., Rogers, E., Bennett, S., Davi, R., Doherty, J.T., Mongan, J.
• Format: Article
• Language: English
• Subjects: Airborne geophysics; Frontier exploration; Geophysical exploration; Geophysics; Gravitation; Gravity; Integrated geophysics; Magnetic; Magnetic data; Magnetic measurement; Mapping; Optimization; Passive seismic; Screening; Sedimentary basins; Seismic analysis; Seismic data; Seismic surveys; Well data
• ISSN: 0016-8025; 1365-2478
• DOI: 10.1111/1365-2478.12706

ABSTRACT Faced with the challenge of rapidly screening a huge expanse of frontier exploration acreage, often characterized by sparse vintage data, it is our experience that a combination of appropriate air‐ and ground‐based geophysical techniques contributes positively to the exploration value chain. Airborne gravity gradiometry in conjunction with conventional gravity and magnetic data, as well as geological knowledge, add significant value to the screening process. This combination can subsequently assist in optimizing the location of the more time‐consuming and expensive seismic programme. In addition, analysis and inversion of passive seismic data have also proven useful in providing depth to basement estimates, and results derived from all the techniques investigated have been consistent within several study areas. Following initial tests, where the data were independently analysed and cross‐checked for consistency (including comparisons with active source seismic data and well data, when available), the company now routinely adopts the integration of these techniques in our frontier exploration acreage to support sedimentary basin delineation and mapping. This allows the optimal positioning and focussing of the higher spend and higher footprint programmes, such as active reflection seismic.