SIMULATION OF INFLUENTIAL FACTORS OF DISPERSIVE RESOLUBLE ORGANIC MATERIALS RESIDENT IN SOURCE ROCKS

The simulations of marine marl with low organic matter abundance under different fluid pressures were carried out. The results indicated that, the peak time of hydrocarbon generation and expulsion was around 310℃ under the pressure of 10 MPa, with the expulsive oil rate and the total oil yielding rate of 182.5 and 193.4 mg/g, respectively. Under 20 MPa, the temperature corresponding to the hydrocarbon generation and expulsion peak was about 330℃, with the expulsive oil rate and the total oil yielding rate of 92.4 and 111.4 mg/g, respectively. It has been suggested that, the increase of pressure represses the thermal evolution of organic materials. It enlarges the effective hydrocarbon expulsion stage of source rocks in addition to postponing the major expulsion period. As a result, the residence time of resoluble organic materials with large quantity has been enlarged, which provides material basis for the generation of gas during the high evolutionary phase.