| Guidelines for assessing the petroleum potential of coaly source rocks using Rock-Eval pyrolysis R Sykes, LR Snowdon Organic geochemistry 33 (12), 1441-1455, 2002 | 339 | 2002 |
| Predicting generation and expulsion of paraffinic oil from vitrinite-rich coals SD Killops, RH Funnell, RP Suggate, R Sykes, KE Peters, C Walters, ... Organic Geochemistry 29 (1-3), 1-21, 1998 | 164 | 1998 |
| Prokaryotic populations and activities in an interbedded coal deposit, including a previously deeply buried section (1.6–2.3 km) above∼ 150 Ma basement rock JC Fry, B Horsfield, R Sykes, BA Cragg, C Heywood, GT Kim, ... Geomicrobiology Journal 26 (3), 163-178, 2009 | 110 | 2009 |
| Sequence stratigraphy and controls on reservoir sandstone distribution in an Eocene marginal marine-coastal plain fairway, Taranaki Basin, New Zealand KE Higgs, PR King, JI Raine, R Sykes, GH Browne, EM Crouch, JR Baur Marine and petroleum geology 32 (1), 110-137, 2012 | 97 | 2012 |
| Geology of the Waikato coal measures, Waikato coal region, New Zealand SW Edbrooke, R Sykes, DT Pocknall Institute of Geological & Nuclear Sciences Limited, 1994 | 77 | 1994 |
| Changes in bulk properties and molecular compositions within New Zealand Coal Band solvent extracts from early diagenetic to catagenetic maturity levels TTA Vu, KG Zink, K Mangelsdorf, R Sykes, H Wilkes, B Horsfield Organic Geochemistry 40 (9), 963-977, 2009 | 74 | 2009 |
| Depositional and rank controls on the petroleum potential of coaly source rocks R Sykes Petroleum Exploration Society of Australia (PESA), 2001 | 74 | 2001 |
| Palynofacies, organic geochemistry and depositional environment of the Tartan Formation (Late Paleocene), a potential source rock in the Great South Basin, New Zealand P Schiøler, K Rogers, R Sykes, CJ Hollis, B Ilg, D Meadows, L Roncaglia, ... Marine and Petroleum Geology 27 (2), 351-369, 2010 | 67 | 2010 |
| Marine influence helps preserve the oil potential of coaly source rocks: Eocene Mangahewa Formation, Taranaki Basin, New Zealand R Sykes, H Volk, SC George, M Ahmed, KE Higgs, PE Johansen, ... Organic Geochemistry 66, 140-163, 2014 | 55 | 2014 |
| Petroleum potential and oil‐source correlation in the Great South and Canterbury Basins SD Killops, RA Cook, R Sykes, JP Boudou New Zealand Journal of Geology and Geophysics 40 (4), 405-423, 1997 | 52 | 1997 |
| Influence of in-situ bitumen on the generation of gas and oil in New Zealand coals TAT Vu, B Horsfield, R Sykes Organic Geochemistry 39 (11), 1606-1619, 2008 | 46 | 2008 |
| Water extraction of coals–potential for estimating low molecular weight organic acids as carbon feedstock for the deep terrestrial biosphere A Vieth, K Mangelsdorf, R Sykes, B Horsfield Organic Geochemistry 39 (8), 985-991, 2008 | 44 | 2008 |
| Diagenetic quartz and amorphous silica in New Zealand coals R Sykes, JK Lindqvist Organic Geochemistry 20 (6), 855-866, 1993 | 40 | 1993 |
| The structural evolution of organic matter during maturation of coals and its impact on petroleum potential and feedstock for the deep biosphere TTA Vu, B Horsfield, N Mahlstedt, HJ Schenk, SR Kelemen, CC Walters, ... Organic geochemistry 62, 17-27, 2013 | 39 | 2013 |
| Interpretation of source rock depositional environment and age from seep oil, east coast of New Zealand ZFM Burton, JM Moldowan, LB Magoon, R Sykes, SA Graham International Journal of Earth Sciences 108, 1079-1091, 2019 | 38 | 2019 |
| Depositional controls on coal distribution and quality in the eocene Brunner Coal measures, Buller Coalfield, South Island, New Zealand RM Flores, R Sykes International Journal of Coal Geology 29 (4), 291-336, 1996 | 37 | 1996 |
| Unraveling petroleum degradation, maturity, and mixing and addressing impact on petroleum prospectivity: Insights from frontier exploration regions in New Zealand ZFM Burton, JM Moldowan, R Sykes, SA Graham Energy & Fuels 32 (2), 1287-1296, 2018 | 35 | 2018 |
| Timing and depth of maturation in southern Taranaki Basin from reflectance and Rank (S) R Sykes, RP Suggate, PR King 1991 New Zealand Oil Exploration Conference proceedings, 373-389, 1992 | 35 | 1992 |
| Peat biomass and early diagenetic controls on the paraffinic oil potential of humic coals, Canterbury Basin, New Zealand R Sykes Petroleum Geoscience 10 (4), 283-303, 2004 | 34 | 2004 |
| Cretaceous carbonaceous rocks from the Norfolk Ridge system, Southwest Pacific: implications for regional petroleum potential RH Herzer, R Sykes, SD Killops, RH Funnell, DR Burggraf, J Townend, ... New Zealand Journal of Geology and Geophysics 42 (1), 57-73, 1999 | 34 | 1999 |
