松辽盆地北部营城组火山岩岩石弹性参数测试及特征分析

火山岩岩性、储层的复杂性，导致火山岩岩石物理基础研究难度较大。为加强火山岩岩石物理基础研究，提高火山岩储层地震预测的精度，本文模拟实际地层温度、压力条件，测量16种岩性、105块岩样在干燥、饱含气和饱含水状态下的纵波速度、横波速度和密度等参数，研究温度、(静岩)压力、孔隙流体压力、不同流体饱和度对波速的影响，并进行不同岩性、含不同流体性质的岩石物理参数特征分析，以期直接进行火山岩岩性、储层的识别。研究结果表明：利用密度和纵波速度交会可以很好地区分基性、中性和酸性火山岩岩性；纵波速度和纵横波速度比交会可以很好地区分火山岩中的水层和气层。

Elastic parameter tests and characteristics analysis of volcanic rocks in Yingcheng Formation,Northern Songliao Basin

Complexity of reservoir of volcanic rocks brings a great difficulty of basic petrophysical study in volcanic rocks. In order to strengthen the basic petrophysical study of volcanic rocks and improve seismic volcanic reservoir prediction, we measures P-wave velocity, S-wave velocity and density of 105 rock samples and 16 kinds of lithologies in the states of dry, full gas and full water saturation under simulating real formation temperature and pressure conditions. Then we study influences of the following factors such as temperature, (static rock) pressure, pore fluid pressure, different fluids' saturations on P-wave and S-wave velocities, analyze petrophysical parameter characteristics of different lithologies and rocks with different fluids for the purpose of direct identification of volcanic lithology and reservoirs. As the result shows, cross plots of density and P-wave velocity can distinguish basic, neutral and acidic rocks, and cross plots of P-wave velocity and S-wave velocity ratio can distinguish water and gas.