论文部分内容阅读
盖层封闭油气的机理主要有薄膜封闭、水力封闭和压力封闭。不管哪种形式的封闭，排替压力对盖层的封闭起着重要的作用。盖层的封闭能力还具有相对性，即使是高排替压力的盖层也只能阻止一定高度的游离相油气通过，而且不能阻止水溶相和扩散相的油气通过。封闭能力较差的盖层，当厚度很大或油气源很充足时，也可起封闭作用。理论和实践证明，盖层的封闭程度受多种因素的影响。综合考虑这些因素，建立相应的数学模型，计算出单位时间内通过盖层单位面积的流体量，以其倒数定义为盖层对流体的封闭指数，用封闭指数对盖层的封闭性进行定量评价。试验证明，这一方法是可行的。
Cover the main mechanism of oil and gas seal closed, closed and pressure closed water. Regardless of the type of closure, displacement pressure plays an important role in the closure of the caprock. The capping ability is also relativistic. Even the high-pressure capping layer can only prevent the passage of a certain degree of free-phase oil gas and can not prevent the passage of oil and gas in the water-soluble phase and the diffusive phase. Closures with poor sealing ability, when the thickness is very large or the source of oil and gas is sufficient, can also play a sealing role. Theory and practice show that the degree of closure of caprock is affected by many factors. Taking these factors into consideration, the corresponding mathematical model is established, and the amount of fluid per unit area through the caprock per unit time is calculated. The closure index of the caprock to the fluid is defined by its reciprocal, and the sealability of the cap is quantitatively evaluated by the closure index . Experiments show that this method is feasible.