砂岩透镜体成藏门限物理模拟实验

利用核磁共振成像技术进行物理模拟实验，能够得到透镜体成藏过程和含油气性的直观、清晰、定量的信息。同一温度、压力、围岩含油饱和度条件下的核磁共振物理模拟实验显示，砂体含油性有随砂体物性增加而变好的趋势，存在一个聚烃门限。当渗透率太低时，围岩中的油不能进入岩心中。同一温度、压力、同一物性的岩心的实验显示，围岩含油气性也是影响岩心含油的重要因素；而且也存在一个临界的围岩含油饱和度下限值即围岩供烃门限，小于这个临界值岩心中无油气的聚集。

Hydrocarbon Accumulation Modeling Experiment of Sand Lens

Clear and quantitative information of hydrocarbon accumulation process and oil-bearing property of sand lens could be obtained by applying nuclear magnet resonance(NMR) to physical modeling experiments. NMR modeling experiment, under condition of the same temperature, pressure and resource rock saturation, showed that, there exist a trending of oil-bearing property of sand body becoming better with the increase of permeability of sand body, and a hydrocarbon accumulation threshold, when the permeability of some sand body is low than the critical value, hydrocarbon can not be accumulated in it. Under the same temperature, pressure and permeability of sand body, NMR modeling experiment showed that oil-bearing property of source rock is also a important factor, and there is also a critical value of source rock oil saturation, that is hydrocarbon supplying threshold, lowing than this value, there is also no hydrocarbon accumulated in sand body.