Geochemical exploration using isoprenoids

Details Geochemical exploration using isoprenoids Geochemical exploration using isoprenoids

1975-07-21

1976-08-17

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

G01N 3108

Patent

active

039751570

ABSTRACT:
A geochemical exploration technique wherein petroleum source rocks are characterized on the basis of an Isoprenoid Generation Index, IGI, which is the ratio of the relative concentrations of the 20-carbon isoprenoid and the sum of the 18 and 16 carbon isoprenoids. Organic extracts of rocks in which diagenesis has not proceeded far enough to have produced migratable petroleum have an IGI of 3 or greater, whereas crude oils and extracts of source rocks have lower values. The IGI is used to calculate other, origin-diagnostic parameters useful in correlating oils and extracts of marine origin.

REFERENCES:
patent: 2854396 (1958-09-01), Hunt et al.
patent: 3847549 (1974-11-01), Schorno
Bayliss, "Formation of Pristane, Phytane, & Related Isoprenoid Hydrocarbons . . . " Chem. Abstr., vol. 71, 1969, No. 114914x.
Brooks et al., "Isoprenoid Hydrocarbons in Coal & Petroleum," Nature, vol. 222, Apr. 19, 1969, pp. 257-259.

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