【摘要】 渤海湾盆地渤中凹陷主要发育有两套烃源岩 :Es3 烃源岩与Ed2 烃源岩。由于该区地处海域 ,埋藏较深 ,对成烃史一直较少涉及。应用生烃动力学方法 ,对该凹陷沉积中心及斜坡带烃源岩生烃史进行了模拟计算。结果表明 ,该凹陷中心Es3 生油岩主生油期出现在 2 0～ 14Ma,主生气期出现在 15～ 10Ma ;Ed2 生油岩主生油阶段出现在 10～ 5Ma,目前仍处在主生气阶段。该凹陷斜坡带Es3 生油岩主生油期出现在 10～ 5Ma ,目前仍处在主生气阶段 ,Ed2 生油岩尚处在主生油阶段。结合渤中凹陷储盖组合及运聚、圈闭条件 ,本研究认为目前在该凹陷及其周围发现的油气藏主要来源于该凹陷 10Ma以后生成的油气 ,油源区主要是斜坡带Es3 与Ed2 生油岩 ,而凹陷中心烃源岩主要对天然气藏有一定贡献。更多还原

【Abstract】 There are mainly two sets of source rocks in the Bozhong Depression of the Bohaiwan Basin: Es 3 source rock and Ed 2 source rock. Since the source rocks in the most area of the depression are buried with a great depth, little work on petroleum generation pattern and history of the source rocks have been done. In this paper, a petroleum generation modeling method which is based on hydrocarbon generation kinetics was applied to investigate petroleum generation history of the source rocks from the depression center and the slope area. The results have shown that the Es 3 source rock from the depression center was matured to the main stage of oil generation and the main stage of gas generation occurred over stage of 20～14 Ma and 15～10 Ma, respectively. The Ed 2 source rock from the depression center passed its oil window during 10～5 Ma, and has a present maturation level of gas peak generation stage. In the slope area of the depression, the situation is quite different. The Es 3 and Ed 2 source rocks entered the main stage of oil generation during 10～5 my and after 2 my, respectively, and the current maturation level of the Es 3 source rock is still in the main stage of gas generation. With the combination of reservoir-cap features, and trapping, migration and accumulation conditions in this depression, it was believed that the oil and gas pools discovered around and inside the depression was related to petroleum generation from the source rocks after 10 my, and the source areas include Es 3 source rocks from the slope area and Ed 2 source rock throughout the depression. The Es 3 source rock from the depression center has a contribution to natural gas accumulation in oil and gas pools.更多还原