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Pre-Drill Pay Definition
We are consultants to the fossil energy sector. We specialise in compositional kinetic models, phase prediction and polar compound geochemistry within geological contexts.
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Latest News
Brian Horsfield reelected Europe Region Delegate to the AAPG House of Delegates
September 8, 2019
Brian Horsfield, CEO of GEOS4, has been reelected as Europe Region Delegate to the AAPG House of Delegates (HoD) in September. During his second term as member of the HoD, Brian will be pleased helping to keep AAPG a relevant, useful and energetic association.
The House of Delegates of the AAPG is made up of delegates from affiliated societies and... More
GEOS4 research on oil and gas shales
July 7, 2019
GEOS4 staff has (co)authored several new research papers on oil and gas shales. A book chapter provides an overview of the chemical, physical, and biological processes involved in the formation of shale gas and shale oil and outline how organic geochemistry can be applied to the exploration and production of these resources. Read also about a joint... More
New GEOS4 research presented at URTeC 2019
May 15, 2019
GEOS4, in collaboration with petroleum industry companies, will present two research papers at the Unconventional Resources Technology Conference URTeC 2019, Denver, Colorado, 22-24 July.
We introduce PhaseSnapShots as a quick and low-cost tool for production efficiency assessments in the Permian Basin, US, and describe the effects of production... More
New screening tool for rapid identification of "sweet spots"
February 24, 2019
For the rapid and inexpensive identification of “sweet spots” or heterogeneities within vertical profiles, GEOS4 has developed a new geochemical screening tool. It is based on the evaluation of amount and composition of sorbed gas within source rocks using Thermovaporisation GC-FID. This can be easily run alongside Rock-Eval pyrolysis in high... More
J.C. Cam Sproule Award to GEOS4 co-authored research paper
January 6, 2019
GEOS4's Nick Mahlstedt and Brian Horsfield are co-authors of the paper Han, Y., B. Horsfield, R. Wirth, N. Mahlstedt, and S. Bernard, 2017, Oil retention and porosity evolution in organic-rich shales: AAPG Bulletin, v. 101, no. 6, p. 807-827, that was recently awarded the J.C. "Cam" Sproule Award by the American Association of Petroleum Geologists.... More