Institut Francais Du Pe'trole

Ifp Energies Nouvelles

François Lorant

Françoise Behar

Violaine Lamoureux-Var

Elodie Salmon

Luc Fusetti

The method according to the invention allows modelling of oil and the retention phenomenon in the source rock. Organic matter characterization experiments are used to establish the molecular model (MM) of the initial sample. The thermal cracking reaction of this molecular model is reproduced by dynamic molecular simulation computations with a reactive force field and validated by comparison with experimental data. The reaction mechanism permits a kinetic study by variation of the temperature parameter. The successive phase equilibrium assessments at various progress stages of the cracking reaction allow following the physicochemical evolution of the thermal maturation of the organic sample. The free hydrocarbons are not retained in the solid residue can be quantified throughout numerical modelling of the sample maturation.

Method of quantifying hydrocarbon formation and retention in a source rock

At least one type of carbon material susceptible to generate a gas G is selected. Then, a model is built from the carbon isotopic composition of a gas P generated by thermal degradation of this type of carbon material. The model is calibrated by calibrating the kinetic effect independently of the precursor effect. In order to achieve that, pyrolyses are performed on compounds modeling the type of carbon material, said compounds being synthesized and labeled withC. Using said model, a carbon isotopic composition of gas P generated is estimated. Finally, it is determined whether gas G has been generated from the selected type of carbon material, by comparing a measured isotopic composition of gas G to the estimated isotopic composition.

Method for determining a gas compositional origin from carbon material thermal degradation

The invention relates to a method allowing to determine at least one petroleum characteristic of a geologic sediment sample, wherein the sample is heated in an oxidizing atmosphere, its temperature being successively raised to a first, then to a second value, said first value below 200&#xb0; C. being reached very quickly, then maintained substantially constant for a certain time, said second value ranging between 600&#xb0; C. and 850&#xb0; C. being reached with a temperature gradient ranging between 1 and 30&#xb0; C./min, from said first value. According to the invention, the amount of SOcontained by the effluent resulting from said oxidizing heating is measured continuously, every moment of the heating period of said sample.

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Thiais, France

François Lorant