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GeoRef Categories
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Availability
On the symmetry and crystal structure of aguilarite, Ag 4 SeS Available to Purchase
Recent Advances in Near-Surface Organic Geochemical Prospecting for Oil and Gas Available to Purchase
Abstract The field of near-surface organic geochemical prospecting for hydrocarbons is more than a half century old (Laubmeyer, 1933; Sokolov, 1933; Horvitz, 1939; Rosaire, 1940). During this time, much evidence has accumulated to validate its fundamental premise, that hydrocarbons move upward from petroleum accumulations at depth to the near-surface. Reviews of the technique are available in Sokolov (1970), Siegel (1974), Leythaeuser et al. (1980), Philp and Crisp (1982), Saenz (1984), and Horvitz (1985). Prospecting for oil and gas by geochemical means is nonetheless still viewed with skepticism in many quarters despite proprietary successes and published investigations that provide it with a sound scientific basis (e.g., Horvitz, 1954, 1972; Stroganov, 1969; Sokolov, 1970; Leythaeuser et al., 1980, 1982,1983a; Saenz, 1984; Kross et al., 1986). A large-scale project of geochemical exploration undertaken in Mexico during the last decade gave an excellent opportunity to establish the reliability of onshore surface prospecting. About 19,000 soil gas samples were taken in a marshy region over seismolog- ically defined structures at depths from 2175 to 6500 m (7000 to 20,000 ft); sampling depths were 3, 15, and 30 m (10,50, and 100 ft). This database, combined with the results of subsequent drilling of the structures, allowed us to address three important issues. First, is it possible to differentiate barren areas from producing areas reliably on the basis of the surface organic geochemical survey? Second, to what extent is such differentiation a function of sampling depth? Third, what are the respective roles of biogenic and thermogenic gases in
Carbonate Facies of Sierra Gomez, Chihuahua, Mexico: ABSTRACT Free
Uranium Mineralization of Sierra Gomez, Chihuahua, Mexico Available to Purchase
Abstract Uranium and silica were leached from volcanic rock of the Mesa Formation and percolated downward to collect along the generally impermeable Cretaceous limestone. Organic matter and pyrite in the limestone furnished the reducing conditions that precipitated the uranium in a hexavalent state.