- map at the link: a very, very thin footprint in southern Texas, stretching from the western border with Mexico to Louisiana
- estimate of undiscovered, technically recoverable resources in continuous accumulations
- oil: 8.5 billion bbls (compare with the Bakken; the USGS Bakken survey of 2013 is linked at the sidebar at the right; the USGS is currently re-surveying the Bakken)
- 66 trillion cubic feet of natural gas (compare with other fields here and below)
- 1.9 billion bbls of natural gas liquids
- one of the most prolific continuous accumulations in the United States, and is comprised of mudstone with varying amounts of carbonate
- continuous oil and gas is dispersed throughout a geologic formation rather than existing as discrete, localized occurrences, such as those in conventional accumulations. Because of that, continuous resources commonly require special technical drilling and recovery methods, such as hydraulic fracturing
- the USGS is the only provider of publicly available estimates of undiscovered technically recoverable oil and gas resources of onshore lands and offshore state waters. The USGS assessment of the Eagle Ford Group was undertaken as part of a nationwide project assessing domestic petroleum basins using standardized methodology and protocol
- the new assessment of the Eagle Ford Formation may be found online
66,000,000,000,000 / 6,001 = 10,998,166,972 boe.
If I've done the arithmetic correctly -- disclaimer -- I often make simple arithmetic errors -- the Eagle Ford is about 50/50 crude oil-NGLs / natural gas.
With regard to natural gas, this link (also above). The numbers below come form multiple sources; many data points are old; and many will opine that the Marcellus and Utica are much bigger than currently assessed:
- Russia: 6,000 trillion cubic feet
- Iran: 1,000 trillion cubic feet
- Qatar: 900 trillion cubic feet
- Turkmenistan: 600 trillion cubic feet
- US: 350 trillion cubic feet
- #11: Australia: 152 trillion cubic feet (as of January, 2014). (See this post.)
- that recent huge Mediterranean natural gas find: 30 trillion cubic feet
- Barnett, revised USGS figures: 53 trillion cubic feet
- Utica, newly revised figures: 782 trillion cubic feet
- Marcellus, EIA revised estimates: 65 trillion cubic feet, "proved" reserves
- October 18, 2017: USGS survey -- 300 trillion cubic feet of natural gas, up from roughly 70 trillion cubic feet in its last survey in 2010.
- Bakken/Three Forks, USGS estimate: 7 trillion cubic feet
- Qatar: 800 trillion cubic feet, wiki, conversion
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