岩性和孔隙流体性质的弹性模量识别法

IDENTIFYING LITHOLOGICAL CHARACTERISTICS AND THE TYPE OF PORE FLUID IN LINE OF ELASTIC MODULI

石油勘探开发科学研究院,北京100083

Research Institute of Petroleum Exploration and Development, Beijing 100083

基于Gassmann方程.本文研究了岩性和孔隙流体性质对弹性模量的影响,由此形成体积弹性模量和剪切弹性模量的交会图,以该交会图识别岩性和流体性质.文中还提出识别流体性质的特定参数法,即从弹性模量中提取与流体性质密切相关的参数.最后,对这二种方法分别给出相应的分析实例.

Based upon Gassmann equations this paper discusses the contribution oflithological characteristics and the type of pore fluid to elastic moduli. A cross plot of bulk elastic modulus versus shear clastic modulus is thus plotted to identify the lithological charactcrisrics as well as the type of pore fluid. Besides, a so-called "specific parameter mcthod'for identifying fluid types is proposed in the paper which implies that a number of parameters which arc closely related to the fluid's property arc required to be extracted. Examples regarding the application of the two methods arc provided in the end of the paper.