Mapping Petroluem Migration Pathways Using Magnetics and Seismic Interpretations

Thursday, 17 December 2015
Poster Hall (Moscone South)
Rabiu Abubakar1, Adrian R Muxworthy2, Mark A Sephton3, Alastair Fraser3, David Heslop4, Greig A Paterson5 and Paul Southern6, (1)Imperial College London, London, SW7, United Kingdom, (2)Imperial College London, Earth Science and Engineering, London, United Kingdom, (3)Imperial College London, London, United Kingdom, (4)Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, (5)Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, (6)University College London, Institute of Biomedical Engineering, London, United Kingdom
We report the formation of magnetic minerals in petroleum reservoirs. Eleven wells from Wessex Basin in Dorset, southern England, were sampled from the British Geological Core Store, across the main reservoir unit; Bridport Sandstone and the overlying Inferior Oolite. Sampling was carried out based on visible evidence of oil stain and a high magnetic susceptibility reading. The samples were chemically extracted to determine which were naturally stained with hydrocarbon and which were not. Magnetic analysis was carried out on all the samples: this including hysteresis analysis at low temperatures (5-15K) and room temperature, and low-temperature thermogmagentic analysis. The results indicated a trend based on the migration of hydrocarbons; from the source area, to the reservoir through the carrier beds.