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向斜区低-超低渗透油藏油水关系复杂,重力分异作用不明显,由坳陷中心向两侧表现为油藏-油水过渡带-正常油藏的特点.通过对松辽盆地低-超低渗透储层中油气水运移方式、动力学条件和非达西渗流状态三方面的探讨,认为滞留效应是石油在向斜低部位成藏的关键.油气在低-超低渗透储层中运移时,气、水以单个或几个分子结合的状态运移,能够自由通过喉道,而油珠的最小直径一般要大于喉道直径,必须通过变形才能通过,导致气、水优先运移,而油珠运移滞留,聚集成藏;流体压力差和浮力是石油运移的主要动力,毛细管力是石油运移的主要阻力.当动力小于阻力时,石油滞留成藏;向斜油藏内部浮力小于毛细管阻力,油水不能发生正常的重力分异.这种在向斜区成熟烃源岩范围内低-超低渗透储层中形成的油藏属于非常规油藏.
The relationship between the oil and water in the low and ultra-low permeability reservoirs in the syncline area is complex and the gravitational differentiation is insignificant, and the reservoir-oil-water transitional zone-normal reservoir from the center to the both sides of the depression is characterized by low- The discussion of migration mode, dynamic conditions and non-Darcy seepage state in ultra-low permeability reservoirs holds that the retention effect is the key to petroleum accumulation in low-lying syncline reservoirs. In the low-ultra-low permeability reservoir Transport, gas and water in a single or a combination of molecular migration, free to pass through the throat, and the minimum diameter of the oil bead is generally greater than the throat diameter, must pass through the deformation, leading to gas, water priority transport The migration of oil droplets and the accumulation of oil droplets accumulate in the reservoirs. The fluid pressure difference and buoyancy are the main driving forces of petroleum migration, and the capillary force is the main resistance of petroleum migration. When the power is lower than the resistance, The reservoir internal buoyancy is less than the capillary resistance, and the normal gravitational differentiation of oil-water can not occur.These reservoirs formed in low-ultra-low permeability reservoirs in the area of mature source rocks of syncline are unconventional reservoirs.