Jump to Rock-Eval Pyrolysis - As TOC is measured in the lab by combustion, a rock can undergo laboratory pyrolysis to measure its total  ‎Overview · ‎Geochemical Evaluation. Among the various techniques available, the geochemical technique involving total organic carbon content (TOC) and rock-eval pyrolysis are. PDF | Kerogen, the major organic component of sedimentary rocks, is commonly analyzed by Rock-Eval pyrolysis. Plotting the data on a graph.


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Source Rock Evaluation

A general risk analysis: The rock eval pyrolysis element in source rock evaluation is the total organic carbon, or TOC, of a rock. TOC is the weigh percent of organic carbon present in a rock which is measured by the amount of CO2 released through combustion.

A potential source rock is considered an effective source rock if it has rock eval pyrolysis hydrocarbons as a result of thermal maturation, or the effect of thermal stress undergone with increasing burial depth.

rock eval pyrolysis Once a rock is determined to have adequate TOC, its thermal maturity determines if the physical conditions required for hydrocarbon generation have been met, and to what extent. The figure demonstrates progression of thermal maturity with respect to temperature and time.

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The timing of a source rocks progression through zones III and IV is critical with regards to exploration and is referred to as the peak oil window. This rock eval pyrolysis represents the maximum generation of liquid hydrocarbons and the most critical timing for pathways of migration and entrapment to be in place.

Geochemical Evaluation Sapropel Index, Bissada Rock-Eval Pyrolysis Petroleum generation is a result of the burial diagenesis of organic rich sediments. Thermal stress without the presence of oxygen is responsible for hydrocarbon generation in rock eval pyrolysis process called pyrolysisas opposed to combustion.

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As TOC is rock eval pyrolysis in the lab by combustion, a rock can undergo laboratory pyrolysis to measure its total generation potential. This type of analysis is conducted after levels of TOC total organic content have been deemed adequate appx.

A rock with insufficient TOC will not generate hydrocarbons. In a pyrolysis analysis, a rock rock eval pyrolysis undergoes increasing temperature in an inert atmosphere where three peaks of released hydrocarbons can be measured.

Source Rock Evaluation - SEG Wiki

The first peak S1 represents the volatilization of any previously generated hydrocarbons present in the rock, given that rock eval pyrolysis has reached adequate thermal maturity.

The second peak S2 is indicative the thermal degradation of any remaining organic material into hydrocarbons.

The final peak S3 is any organic CO2 present in the rock.

In summary, the four basic parameters obtained by pyrolysis Fig. F4; from Tissot and Welte, are rock eval pyrolysis follows: S1 normally increases rock eval pyrolysis depth. Contamination of samples by drilling fluids and mud can give an abnormally high value for S1.

S2 is an indication of the quantity of hydrocarbons that the rock has the potential of producing should burial and maturation continue. S3 is an indication of the amount of oxygen in the kerogen and is used to calculate the oxygen index see below.


Contamination of the samples should be suspected if abnormally high S3 values are obtained. Tmax is an indication of the stage of maturation of the organic matter.

The TOC is then determined rock eval pyrolysis adding the residual organic rock eval pyrolysis detected to the pyrolyzed organic carbon, which in turn is measured from the hydrocarbon compounds issuing from pyrolysis. The type and maturity of organic matter in petroleum source rocks can be characterized from Rock Eval pyrolysis data see Fig.

F5; from Emeis and Kvenvolden,