Understanding Oil and Gas Shows and Seals in the Search for by John Dolson

By John Dolson

This publication explains intimately the best way to use oil and fuel convey info to discover hydrocarbons. It covers the fundamentals of exploration methodologies, drilling and dirt structures, cuttings and dirt gasoline convey evaluate, primary log research, the pitfalls of log-calculated water saturations, and a whole evaluation of using pressures to appreciate traps and migration, hydrodynamics, and seal and reservoir quantification utilizing capillary strain. additionally integrated are suggestions for speedy producing pseudo-capillary strain curves from basic porosity/permeability info, with examples of the way to construct spreadsheets in Excel, and an entire remedy of fluid inclusion research and fluid inclusion stratigraphy to map migration pathways. moreover, petroleum structures modeling and primary resource rock geochemistry are mentioned intensive, relatively within the context of unconventional resource rock overview and screening instruments for getting into new performs. The e-book is seriously illustrated with quite a few examples and case histories from the author’s 37 years of exploration event. the subjects lined during this publication will provide any younger geoscientist a brief begin on a winning occupation and function a refresher for the more matured explorer.

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Sample text

13a, for instance, is a Cretaceous fluvial reservoir from seismic, while Fig. 13b is an aerial photo of a similar depositional system on the earth’s surface today. Likewise, ancient deep water channels and Miocene and Devonian reef and shelf edges are clear on Fig. 13c–e. When I consult with younger geophysical staff, I am frequently presented with seismic amplitude maps that have no discernable geometry to them. If the geometry isn’t clear, or resembling a modern depositional system, then the imaging is not very good and has limited predictability.

The oil and gas industry has long been focused on developing methods to determine how much oil and gas is left in basins or how well an industry or company is doing finding it (Arps et al. 1971; Arringdon 1960). One of the most influential papers was that of Hubbert (1967), who predicted that US ‘peak oil’ would be reached in the 1970s and then begin a steady decline. Actual US production until the last decade tracked Hubbert’s curve almost precisely, leading many to declare that ‘peak oil’ had been reached and the world would soon run out of oil However, within the last decade, that decline curve has been obliterated.

Where should I drill based on the best map? Quantifying shows is the essence of this book. I was fortunate to start out in a basin where wells were cheap, costing as little at $150,000 per well and taking only about 5 days to drill. In contrast, the last well I drilled for BP, in 2003, found a giant field in the deep water Nile Delta but cost $79 million to drill and was over budget. Last year, BP made another deep discovery in the Nile Delta where the well cost exceeded $300 million dollars. These expensive plays are not a good place to be working for a young geoscientist, as it takes too long to learn how to drill wells (many years).

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