摘要
为找出琼东南盆地浅水区与深水区烃源岩有机质热演化差异原因,在综合开展琼东南盆地构造演化、沉积充填与地球化学特征研究基础上,对影响烃源岩有机质成熟度的各要素进行逐一分析。结果表明,深水区高地温梯度、低沉积速率背景对有机质热演化有明显的促进作用,而深水区低海底温度对有机质热演化有一定的抑制作用,超压对有机质热演化作用不明显。综合盆地模拟各要素表明,深水区有机质热演化程度明显高于浅水区,深水区生烃门限浅的特点扩大了深水区烃源岩成熟面积,增加了烃源岩的生排烃量,从而提高了盆地的资源潜力。研究成果对其他深水盆地的烃源岩热演化相关研究有很好的借鉴意义。
In order to find out the reasons for the difference of organic thermal evolution of source rocks in shallow and deep water areas,on the basis of integrated study of tectonic evolution,sedimentary filling and geochemical characteristics of Southeastern Hainan Basin,the factors affecting the maturity of organic matter in source rocks were analyzed one by one. The study results show that the background of high geothermal gradient and low deposition rate in the deep water area can obviously promote the thermal evolution of organic matter,while the low bottom-water temperature in the deep water area has a certain inhibition on the thermal evolution of organic matter,and the overpressure has no obvious effect on the thermal evolution of organic matter. The integrated basin modelling shows that the thermal evolution degree of organic matter in deep water area is obviously higher than that in shallow water area,and the characteristic of shallow hydrocarbon generation threshold in deep water area enlarges the maturation area of source rock in deep water area,increases the hydrocarbon generation and expulsion capacity of source rock,and improves the resource potential of the basin accordingly. The study achievements can be used for reference in the study of thermal evolution of source rocks in other deep water basins.
引文
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