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本文介绍利用声波—电阻率交会法、声波—中子寿命交会法、深浅双侧向交会法划分气、水层的原理、方法和实例。这些方法在碳酸盐中划分气、水层取得一定的效果。一、声波—电阻率交会法原理:根据公式(1)(2)在以孔隙为主碳酸岩地层中,我们取:由(1),(2)两式得:(3)(3)式表明在 R_w 和 S_w 不变的情况下,φ与1/(?)有线性关系,我们以φ作纵座标,1/(?)作横座标,相同含水饱和度的点就应落在同一直线上,利用不同的含水饱和度可以区分气、水层。
This paper introduces the principles, methods and examples of using gas-resistivity intersection method, sonic-neutron lifetime intersection method, and shallow-depth two-way intersection method to divide gas and water layers. These methods divide the gas in the carbonate, the water layer to achieve a certain effect. First, the sonic-resistivity cross-law principle: According to the formula (1) (2) in the pore-based carbonate rock formation, we take: from (1), It shows that φ and 1 / (?) Have a linear relationship when R_w and S_w are constant, and we use φ as the ordinate and 1 / (?) As the abscissa, and the same water saturation point should fall on the same Straight line, using different water saturation can distinguish between gas and water layer.