饱和多孔岩石的衰减与孔隙率和饱和度的关系  

Relation between attenuation and porosity or saturation of rock

作　　者：席道瑛[1] 邱文亮[1] 程经毅[1] 易良坤[1] 张斌[1] 谢端[1] 

机构地区：[1]中国科学技术大学地球与空间科学系

出　　处：《石油地球物理勘探》1997年第2期196-201,共6页Oil Geophysical Prospecting

基　　金：中国科学院固体研究所资助;中国科技大学内耗与固体缺陷开放实验室资助;国家自然科学基金

摘　　要：地震波在岩石中的衰减实际上是指波的振动能量在岩石内部的损耗。本文通过作低频共振实验，获得了不同饱和流体砂岩的衰减与温度关系曲线、衰减与砂岩孔隙率线性关系曲线、以及衰减与饱和度关系曲线。从中可以看出：衰减峰的峰温随砂岩孔隙率的增大向低温方向移动；峰高随砂岩孔隙率的增大而增高；衰减量随砂岩孔隙率的增大而增加，也随砂岩饱和度的增加而增大。当砂岩达到全饱和时，其衰减反而减小。这项实验结果对提高油气田的采收率是有益的。Seismic wave attenuation in rock means wave energy loss in rock. From the low-frequency resonance vibration experiment of sandstones which are filled with different fluids,we can obtain some relations,namely, the relation between attenuation and temperature,the linear relation between attenuation and porosity,and the relation between attenuation and saturation. These relation curves indicate that the sandstone with higher porosity has lower peak-attenuation temperature but higher peak attenuation,and that the attenuation grows with the increase of porosity or saturation of sandstone (note: the full saturation reduces attenuation). The experiment result favours the improvement of oil recovery ratio.

关 键 词：地震波 砂岩 衰减 孔隙率 饱和度 地震勘探 

分 类 号：P631.41[天文地球—地质矿产勘探]