THE MATHEMATICAL SIMULATION OF HYDROCARBON SOURCE ROCK EVOLUTION IN YA'NAN FAULT SAG, QIONGDONGNAN BASIN
Wu Jingfu Chen Rongshu Tao Yichuan (China University of Geosciences, Wuhan 430074)
On the basin of the previous work in the thermal evolution of hydrocarbon source rock, and combined with the practical geologic conditions of Ya'nan fault sag, each coefficient of the thermal evolution mathematical model has been deter-mined in this paper. Some correction of the model has been made, so that it can be applied to the concrete situation in Ya'nan fault sag better. The research we have done is as follows: (l)Since Eogene there have been three tectonic cycles, among them the third cycle is still confined to it's early fault sag stage; (2) The time that hydrocarbon source rock enters mature threshold in this area is different obviously from 5Ma to 20Ma, because there have been different geologic back-grounds in terms of various geothermal fields and tectonic rates of subsidence; (3) The formulation of hydrocarbon source rock mathematical model in this area pro-vides an efficient method for rapid and quantitive assessment of source rock.