Petroleum Science >2012, Issue 1: 31-37 DOI: https://doi.org/10.1007/s12182-012-0179-8
Fluid substitution in a shaley sandstone reservoirat seismic scale Open Access
文章信息
作者：Li Jingye
作者单位：
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China; CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum, Beijing 102249, China
投稿时间：2011-04-06
引用方式：Li, J. Pet. Sci. (2012) 9: 31. https://doi.org/10.1007/s12182-012-0179-8
文章摘要
Shaley sandstone is heterogeneous at a seismic scale. Gassmann’s equation is suited for fluid
substitution in a homogeneous medium. To study the difference between shaley sandstone effective elastic
moduli calculated by mean porosity as a homogeneous medium, and those calculated directly from the
sub-volumes of the volume as a heterogeneous medium, computational experiments are conducted on
Han’s shaley sand model, the soft-sand model, the stiff-sand model, and their combination under the
assumption that the shaley sandstone volume is made up of separate homogenous sub-volumes with
independent porosity and clay content. Fluid substitutions are conducted by Gassmann’s equation on
rock volume and sub-volumes respectively. The computational data show that at seismic scale, there are
minor differences between fluid substitution on rock volume and that on sub-volumes using Gassmann’s
equation. But fluid substitution on sub-volumes can take consideration of the effects of low porosity and
low permeability sub-volumes, which can get more reasonable data, especially for low porosity reservoirs.
substitution in a homogeneous medium. To study the difference between shaley sandstone effective elastic
moduli calculated by mean porosity as a homogeneous medium, and those calculated directly from the
sub-volumes of the volume as a heterogeneous medium, computational experiments are conducted on
Han’s shaley sand model, the soft-sand model, the stiff-sand model, and their combination under the
assumption that the shaley sandstone volume is made up of separate homogenous sub-volumes with
independent porosity and clay content. Fluid substitutions are conducted by Gassmann’s equation on
rock volume and sub-volumes respectively. The computational data show that at seismic scale, there are
minor differences between fluid substitution on rock volume and that on sub-volumes using Gassmann’s
equation. But fluid substitution on sub-volumes can take consideration of the effects of low porosity and
low permeability sub-volumes, which can get more reasonable data, especially for low porosity reservoirs.
关键词
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Fluid substitution, Gassmann’s equation, shaley sandstone, seismic scale