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A Rock-Eval is a device developed by the Institut Francais de Ptrole to perform standard measurements on (bulk) organic material in sediment. From these measurements information can be derived about the type of organic material, the degree of coalification and the potential of the sediment for oil or gas generation. The information is used in oil and gas exploration for the reconstruction of the temperature history of sedimentary basins.

Measurements

S1		quantity of free hydrocarbons (gas + oil), in mg/g of rock
S2		quantity of thermally generated (cracked) hydrocarbons, in mg/g of rock
S3		quantity of CO2 generated during pyrolysis of the sample, in mg/g of rock
S4		quantity of CO2 generated during oxidation of the sample, in mg/g of rock
Tmax		Temperature in °C, at which the largest quantity of hydrocarbons is released upon cracking
PI		Production Index; PI = S1/(S1+S2)
PC		quantity of carbon that can be pyrolysised
RC		quantity of carbon that remains in the sediment following pyrolysis
HI		Hydrogen Index in mg/g of rock, HI = (S2*100)/TOC
OI		Oxygen Index in mg/g of rock, OI = (S3*100)/TOC
TOC		Total Organic Carbon, TOC(%) = PC + RC
MinC		Mineral Carbon, the quantity of C contained in minerals

Description of the method of analysis
The sample is pyrolysised according to a set temperature programme (300°C, 3 min. const. => with 25°C/min. to 650°C) and subsequently oxidised in a second furnace (300°C, 3 min. const. => with 20°C/min. to 850°C). Hydrocarbons that are released are measured using a Flame Ionisation Detector (FID) and form the so-called S1 and S2 peak. In addition, the CO and CO2 generated are measured during the pyrolysis using an Infrared (IR) cell. This provides information on the oxidation status of the organic material. CO and CO2 are measured during the oxidation and that provides information on the TOC and MinC.

Quality
In assessing the reliability of the measurements, it is noted that Rock-Eval data are not reliable if the TOC value <0.5%.
THE TMAX VALUE IS UNRELIABLE IF THE S2 PEAK IS TOO LOW.

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	Exploration and survey data
	Borehole data
	2D and 3D seismics
	Organic geo-chemical data
	Rock-Eval measurements
	Vitrinite Reflectance measurements
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