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Hydrocarbon microseepage

The occurrence at surface of hydrocarbon seeps suggests that an oil or gas reservoir leaks even though it acts as a trap for hydrocarbons. Macroseepage is the visible presence of oil and gas seeping to the surface. Macroseeps have been documented in various parts of the world (Davidson, 1963 Sittig, 1980 Hunt, 1981 Davis, 1967 Tedosco, 1995). Microseeps are invisible trace quantities of hydrocarbons seeping to the [Pg.233]

Although microseeps (and macroseeps) represent leakage from a temporarily stationary source of petroleum, they do not necessarily indicate the presence of economically-recoverable hydrocarbons at depth. The economic viability of the underlying reservoir can only be established by further exploration. [Pg.234]

The surface manifestation of hydrocarbon microseepage in not necessarily confined to the presence of trace quantities of hydrocarbons. Schumacher (1996) made a thorough review of the major hydrocarbon-induced changes affecting soils and sediments and their implications for surface exploration. [Pg.234]

Schumacher (1996) contended that long-term leakage of hydrocarbons can establish locally-anomalous redox zones that favour the development of a diverse array of chemical and mineralogical changes. The bacterial oxidation of light hydrocarbons can [Pg.234]

Where such changes can be measured and mapped at surface, they provide the basis for a number of surface exploration methods for petroleum. Some of these changes are in principle amenable to measurement and mapping by remote sensing techniques. [Pg.235]


The main conclusion of this study is that hydrocarbon-based surface geochemical methods can discriminate between productive and non-productive oil and gas reservoir areas. Variables in surface soils that best distinguish productive and non-productive areas are ethane and n-butane and heavy (C24+) aromatic hydrocarbons. Heavy metals (U, Mo, Cd, Hg, Pb) are possibly indirect indicators of hydrocarbon microseepage, but they are more difficult to link with the reservoirs. [Pg.125]

Both direct and indirect methods were tested in the Lisbon area. Direct methods include the assessment of hydrocarbon compositional signatures in surface soils, outcrop fracture-fill soils and mosses, and 6-ft (2 m) deep free-gas samples. Indirect methods pertain to the major and trace element chemistry of soils to look for alteration effects resulting from hydrocarbon microseepage. [Pg.126]

Saunders, D. F., Burson, K.R.,. Thompson, C.K. 1999. Model for hydrocarbon microseepage and related near-surface alterations AAPG Bulletin, 83, 170-185. [Pg.392]

Fig. 7-2. Spectra of minerals associated with hydrocarbon microseepage. Fig. 7-2. Spectra of minerals associated with hydrocarbon microseepage.
Crawford, M.F., 1986. Preliminary evaluation of remote-sensing data for detection of vegetation stress related to hydrocarbon microseepage Mist gas field, Oregon. Proc. Fifth Thematic Conference on Remote Sensing for Exploration Geology, Reno, pp. 161-177. [Pg.477]

Rock, B.N., 1984. Remote detection of geobotanical anomalies associated with hydrocarbon microseepage. Proc. Third Thematic Conference on Remote Sensing for Exploration Geology, Colorado Springs, pp. 183-195. [Pg.500]


See other pages where Hydrocarbon microseepage is mentioned: [Pg.127]    [Pg.127]    [Pg.391]    [Pg.391]    [Pg.233]    [Pg.233]    [Pg.234]    [Pg.238]    [Pg.240]    [Pg.240]    [Pg.241]    [Pg.242]    [Pg.244]    [Pg.244]    [Pg.245]    [Pg.245]    [Pg.339]    [Pg.507]    [Pg.564]   


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Microseepage

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