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从测井解释概念出发,如果一个油藏(或气藏)的储集层是由同一岩性(如砂岩或石灰岩)所组成,那么在岩石颗粒粗细和孔隙度大小基本相同的情况下,油层(或气层)中的束缚水饱和度保持恒定,而自由水饱和度在毛细管压力作用下,随着油层埋藏深度的增加而增大。也就是说,在构造顶部的油(气)层,只存在束缚水饱和度,无自由水饱和度;在构造翼部的油(气)层,特别是在油水过渡带,除存在束缚水饱和度而外,还存在一部分自由水(可动水)饱和度;而在构造底部,油水过渡带下面,存在束缚水和自由水饱和度。当束缚水饱和度与自由水饱和度相加等于100%时,这就是油(气)藏油水或气水分界面的位置。
Starting from the concept of log interpretation, if the reservoir of a reservoir (or gas reservoir) consists of the same lithology (eg, sandstone or limestone), then with the same rock particle size and porosity, the reservoir (Or gas layer) irreducible water saturation remains constant, while the free water saturation under the capillary pressure, with the reservoir depth increases. In other words, there is only irreducible water saturation and no free water saturation at the top of the oil (gas) layer. In the oil (gas) layer where the wing is constructed, especially in the oil-water transition zone, except for the presence of irreducible water saturation Degree outside, there is still part of the free water (movable water) saturation; and at the bottom of the structure, oil and water transition zone, there is irreducible water and free water saturation. When the irreducible water saturation equals 100% of the free water saturation, this is the location of the oil-water or gas-water interface at the reservoir.