Integrated geophysical exploration in onshore frontier basins
F. Martini, E. Rogers, S. Bennett, R. Davi, J.T. Doherty and J. Mongan
Journal name: Geophysical Prospecting
Issue: Vol 67, No 6, July 2019 pp. 1664 - 1675
Info: Article, PDF ( 34.92Mb )
Faced with the challenge of rapidly screening a huge expanse of frontier explo-ration acreage, often characterized by sparse vintage data, it is our experience that a combination of appropriate air- and ground-based geophysical techniques con-tributes 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 ex-pensive seismic programme. In addition, analysis and inversion of passive seismic data have also proven useful in providing depth to basement estimates, and re-sults derived from all the techniques investigated have been consistent within sev-eral study areas. Following initial tests, where the data were independently analysed and cross-checked for consistency (including comparisons with active source seis-mic data and well data, when available), the company now routinely adopts the integration of these techniques in our frontier exploration acreage to support sedi-mentary basin delineation and mapping. This allows the optimal positioning and fo-cussing of the higher spend and higher footprint programmes, such as active reflection seismic.