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Prediction of Hydrocarbon Using 1-D Numerical Modelling of Low Temperature Thermochronology for Various Basin Scenarios
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First EAGE Digitalization Conference and Exhibition, Nov 2020, Volume 2020, p.1 - 5
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Abstract
Thermochronometer age provide time since our temperature thermochronometers have cooled down till present. Degree of maturation of organic matter i.e. kerogen in the rock depends on the maximum temperature it has achieved in its thermal history and the amount of time it has spent in that temperature range. Low temperature thermochronology helps to relate the age of cooling to the oil and gas window and help to identify whether the kerogen has been overcooked or preserved in the rock. As low temperature thermochronometers have low effective closure temperature which is in junction to oil and gas window, AFT have closure temperature ∼120° C while range of oil window lies between 50° – 150°C. Numerical model for predicting the Apatite Fission Track (AFT) age using low temperature thermochronology has been developed using Python under various condition of exhumation and subsidence of a basin in 1-D. The model requires certain material parameters & characteristics such as subsidence and exhumation rate, conductivity, thermal diffusivity, thermal gradient, transition time, specific heat, etc. Model provides with the AFT age along with the fission track length distribution statistics in the mineral at present time and depth history of the rock.