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N. V. Lopatin in the Soviet Union has developed a method for taking both time and temperature into account as factors in thermal maturation of kerogen. Lopatin's time-temperature index of maturity (TTI) values correlate with the thermal regimes corresponding to generation and preservation of hydrocarbons. Because such information is potentially of great interest for oil exploration, a calibration and evaluation have been made of Lopatin's method. Within the limitations of the data presently available the following statements can be made:
1. The rate of the chemical reactions involved in thermal maturation of organic material appears to double with every 10°C (18°F) rise in temperature.
2. Threshold values of Lopatin's time-temperature index of maturity (TTI) are:
15 Onset of oil generation 75 Peak oil generation 160 End oil generation ~500 40° oil preservation deadline ~1,000 50° oil preservation deadline ~1,500 Wet gas preservation deadline >65,000 Dry gas preservation deadline
3. TTI values calculated from Lopatin reconstructions consistently agree with other maturation parameters commonly used by petroleum geochemists.
Potential applications of Lopatin's method for oil exploration include timing of oil generation, calculation of volume of hydrocarbons generated within a basin, and determination of economic deadlines.
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