砂岩泊松比垂向变化差异分析

Poisson' s Ratios with Depth in Sand Formation

从均匀各向同性完全弹性介质中泊松比与纵横波的关系出发，根据Ｄ地区全波列测井资料建立了该区泊松比随深度变化的关系：浅层泊松比随深度增加而增加，到达一定深度，泊松比随深度增加而逐渐减小，然后达到－稳定值。在此基础上进一步对该区含不同流体砂岩的沮松比特征及其随深度变化规律进行探讨．在浅层，含气、含油、含水砂岩的泊松比差别较大，其中含气砂岩泊松比最小，含水砂岩泊松比最大；在深层，三者之间的差别较小。

Based on the relationship between the poisson's ratio and the velocity ratio of p-wave and S-wave data from full sonic well-logging in uniform isotropic elastic media, the variation of poisson,s ratio versus depth is investigated. Poisson's ratio increaseswith depth in shallow surfaces and decreases under certain depth, then keeps constant.From this, the poisson's ratio of the sandstone with different fluids is given. The difference of poisson's ratio of gas-bearing, oil-bearing and water-beraing sandstone is larger in shallow surfaces, which poisson's ratio of water-bearing sandstone is maxmium, gasbearing minimum. The difference of the three sandstone is smaller under certain depth.