砂岩透镜体“相—势”控藏实验模拟

沉积相和流体势是油气成藏的2个重要因素。通过二维物理模拟实验,分析了不同物性的砂岩透镜体成藏过程中的流体势,探讨了相和势对砂岩透镜体成藏的控制作用，结果表明，油总是从高势区向低势区运移,并在低势区聚集成藏，流体势决定了砂岩透镜体成藏的可能性；砂岩透镜体自身物性的好坏对其成藏过程具有重要的影响，所形成油藏的含油饱和度随着孔隙度、渗透率的增大而增大;相和势共同控制着透镜体成藏及成藏效果,处于低势区的物性好的砂岩透镜体不易成藏,处于高势区的物性差的砂岩透镜体也不易成藏;低势区透镜体与外围流体势差越大,砂体物性越好,透镜体充满度越大。

EXPERIMENTAL SIMULATION OF "PHYSICAL PROPERTY-FLUID POTENTIAL" CONTROLLING THE OIL ACCUMULATION IN SAND LENS

Physical properties and fluid potential are two important factors in the formation of sand lens reservoirs. Based on the two-dimention physical experiment, the paper studies the fluid potential and the interrelations between physical property, fluid potential and accumulation of sand lens. The results of the experiments show that oil always moves from high potential to lower one, and fluid potential determines whether sand lens can be input by oil or not. The oil saturation of sand lens reservoir varies consistently with the change of the porosity and permeability. The sand lens in the lower potential district is more prone to form oil reservoirs than that in high potential district. Moreover, the bigger the fluid potential difference between the sand lens and that of surroundings, the higher the oil saturation of sand lens.