College of Earth Sciences, Jilin University, Changchun 130061, China

In order to study the regularity of hydrocarbon generation of oil shale using convection heating technology and find out the well location suitable for oil shale in-situ exploitation, multi-well heat injection and single well heat injection schemes, in the shapes of regular triangle, square and hexagon, as simplified models, were built to carry out the simulation of temperature field using the ANSYS software. Equations of the chemical reaction kinetics in oil shale hydrocarbon generation were constructed and solved by MATLAB software to obtain the amount of hydrocarbon generated during oil shale in-situ exploitation and compare the input and output results of different well locations. The simulation results show that the amount of hydrocarbon generated from oil shale increases with the heat injection process, it increases significantly first then slows down. After 36 months of heating, the growth is not obviously. The effect of multi-well heating plan is better than that of single-well. The maximum net hydrocarbon generation, occurs in the 20th month is the six well model which is 1 141.85 tons, followed by that in the 25th month of four well model, which is 1 034.63 tons. The last is in the 22nd month of three well model, which is 878.95 tons. In the single-well heating modes, the max hydrocarbon generation is 390.00 tons in the 33rd month. In the multi-well heating modes, the energy return ratios of each mode are 2.73, 1.74 and 2.05, respectively, and the energy return ratio of the single-well heating modes is 1.418.