用孔隙、裂隙介质弹性波理论反演岩石孔隙分布特征  

Inversion for micro-pore structure distribution characteristics using cracked porous medium elastic wave theory

作　　者：唐晓明 王鹤鸣[1,3] 苏远大 陈雪莲[1,3] TANG XiaoMing;WANG HeMing;SU YuanDa;CHEN XueLian(School of Geosciences,China University of Petroleum,Qingdao Shandong 266580,China;Qingdao National Laboratory for Marine Science and Technology,Qingdao Shandong 266580,China;Key Laboratory of Deep Oil and Gas,China University of Petroleum,Qingdao Shandong 266580,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580 [2]青岛海洋科学与技术试点国家实验室,青岛266580 [3]中国石油大学(华东)深层油气重点实验室,青岛266580

出　　处：《地球物理学报》2021年第8期2941-2951,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金(41821002);国家重点研发计划(2019YFC0605504);中石油重大科技项目(ZD2019-183-004)联合资助.

摘　　要：“孔隙、裂隙介质的弹性波动理论”描述了介质中孔隙与裂隙相互作用的弹性波特征,已被广泛用来模拟和解释实际岩石的声学性质.本文将该理论进一步扩展,用以描述孔隙与多形态裂隙体系的相互作用.扩展理论的一个重要应用是模拟实验室流体饱和岩石在压力加载条件下的弹性波速数据,利用不同形态的裂隙在压力作用下产生的波速变化来反演裂隙的纵横比分布谱.对高孔渗砂岩、致密砂岩和花岗岩岩芯数据的反演结果清晰地反映了不同岩性的岩石中裂隙的纵横比分布特征,且与这些岩芯的扫描电镜分析结果一致.本文的研究不仅为扩展理论提供了实验验证,而且给出了一种分析岩石孔隙结构特征的有效方法.The elastic wave theory of cracked porous media describes the wave propagation characteristics due to the pore-crack interaction in the medium,which has been widely used to model and explain acoustic properties of earth formation rocks.This paper further extends the theory to describe the interaction between pores and morphologically distributed cracks.An important application of this extended theory is the modeling and inversion of the laboratory elastic-wave velocity data of fluid-saturated rock samples measured under pressure loading conditions,so as to determine the morphological distribution,or the pore aspect ratio spectrum,of the pore structure.The inversion results of high porosity sandstone,tight sandstone,and granite core samples clearly reflect the pore structure distribution characteristics in different rock lithologies.The results are consistent with those from the scanning electron microscope analysis of these rock samples.This research provides not only the experimental verification for the extended theory,but also an effective method to analyze the pore structure distribution characteristics of rocks.

关 键 词：岩石物理 孔裂隙介质 孔隙分布 孔隙纵横比谱 弹性波传播 

分 类 号：P631[天文地球—地质矿产勘探]