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阿尔伯达Leduc期气藏的天然气产量仍然很高,其原始天然气地质储量(OGIP)超过400×10~9m~3。由于这类底水驱动气藏的可采储量既依赖于圈闭气饱和度又依赖于水体的动态,故计算其采收率十分困难,推广岩心驱替实验及应用有限的油田经验也成问题。 随着一些接近成熟技术的应用,现在有可能综合岩心驱替资料及矿场特性,来阐明控制其天然气采收率的因素。本研究能够证明:圈闭气饱和度依存于许多因素,包括润湿性、原始流体饱和度及渗透率。开发出了一种计算并解释该类气藏降压开采的简单解析模型,并解释了一套Leduc期气藏的实际动态,用以验证模型的适用性。
Natural gas production in the Leduc Period gas reservoirs in Alberta is still high, with an OGIP of more than 400 × 10 ~ 9 m ~ 3. Since the recoverable reserves of such bottom-water-driven gas reservoirs are dependent on the gas saturation of the trap and on the dynamics of the water bodies, it is very difficult to calculate the recovery rate. It is also a problem to popularize core-flooding experiments and apply limited oilfield experience. With the application of some near-mature technologies, it is now possible to clarify the factors that control natural gas recovery by combining core-flooding data and mine properties. This study demonstrates that trap gas saturation depends on many factors, including wettability, initial fluid saturation and permeability. Developed a simple analytical model to calculate and explain depressurization of such gas reservoirs and explained the actual dynamics of a Leduc gas reservoir to verify the applicability of the model.