地震资料用于盖层封闭油气的综合定量评价方法

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

Quantitative barrier hydrocarbon sealing evaluation using seismic data

Barrier hydrocarbon sealing mainly results from membrane,water power and pressure. Anyhow, displacement pressure plays an important role in hydrocarbonsealing.The barrier sealing ability is relative jeven the high displacement pressure barrier only stops free hydrocarbon at a certain level,without obstruction to diffuse hydrocarbon and water solution hydrocarbon. Less-poor barrier also stops hydrocarbon when it is very thick or there is abundant hydrocarbon resources. It is theoretically and practically shown that barrier sealing is controlled by many factors. By comprehensively analysing these factors, we can make a reasonable mathematic model to work out fluid flux in unit area/unit time,whose reciprocal is defined as fluid sealing coefficient for sealing ability evaluation of the barrier. The experiment shows the method feasible.