Physical analysis of acoustic characteristics of Cretaceous volcanic rocks in the Songliao basin.
松辽盆地白垩系火山岩储层岩石物理声学特性分析

To obtain rock physical parameters of 57 core samples from 9 different exploratory wells in the Xujiaweizi area of the Songliao basin, the samples are tested in the laboratory under reservoir conditions. The samples are all volcanic rocks from the Yingcheng Formation. The aim of the experiment is to provide the basis to gradually realize direct fluid identification of volcanic reservoirs by geophysical techniques. With the ultrasonic transmission method, acoustic parameters of the samples have been measured with the velocities of compressional and shear waves. The characteristics of rock physics of the samples in different fluid states were also analyzed in detail. Results indicate that the gas- and brine-bearing volcanic reservoirs can be distinguished in dual-parameter domain space, especially in the space of the body parameter and the shearing parameter.