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本文中通过Saskatchewan地区Ross稠油油田已钻井11—25—13—17W3分析了该井的地震衰减及岩石物理之间的关系。通过测井曲线分析得知,该井钻遇的主要岩性为泥岩和泥质砂岩。文中运用近炮检距VSP数据中光谱比值法估算纵波与横波的Q值(垂直和水平可控震源同时使用)。400～1050m估算的P波Q值可靠,225～1050m估算的横波Q值可靠。Q值大小与石油物性关系紧密。纵波Qp值随纵波速度的增加而增加,随vp/vs和孔隙度的减小而减小。泥质砂岩的Qp衰减程度要大于纯泥岩和砂岩的。从Qp和粘土层中水的交汇图中可以看出,泥质砂岩的衰减可能是由于重力水和粘土层中的水相互作用的结果。横波的Q值也显示出类似的关系。从VSP速度和声波速度比较中可以看到速度差异。通常情况下,纵波的声波速度比VSP速度要高3.4%,横波的声波速度比VSP速度高4.8%。
In this paper, the relationship between the seismic attenuation and the rock physics of the well has been analyzed through the Ross heavy oilfield in the Saskatchewan region, 11-25-13-17W3. According to the analysis of well logging curves, the main lithologies encountered by this well are mudstone and shaly sandstone. In this paper, Q ratio of longitudinal and transverse waves is estimated by spectral ratio method in near-offset VSP data (simultaneous use of vertical and horizontal vibrators). The Q value of P wave estimated from 400m to 1050m is reliable, and the Q value of shear wave estimated from 225m to 1050m is reliable. Q value and the physical properties of petroleum closely. The Qp value of the longitudinal wave increases with the increase of the compressional wave velocity and decreases with the decrease of the vp / vs and the porosity. The Qp attenuation of shaly sandstone is greater than pure mudstone and sandstone. As can be seen from the intersection of Qp with the water in the clay layer, the decay of the shaly sandstone may be the result of the interaction of water in the gravity water with the water in the clay layer. The Q value of the shear wave also shows a similar relationship. Speed differences can be seen by comparing VSP speed and sound speed. Normally, longitudinal waves have a sonic velocity 3.4% higher than VSP and sonic waves 4.8% higher than VSP.