摘要
对济阳坳陷古近系地层87块砂岩样品进行了模拟地层条件(温度、压力)的实验测试,结合岩心薄片分析资料,分析研究了有效压力、岩性对Biot系数和弹性模量的影响。结果表明,Biot系数随着有效压力和钙胶结物增加而减小,随着孔隙度增加而增大;体积模量随着有效压力增加而增大;建立了Biot系数模型和岩石弹性模量与孔隙度关系模型;利用该模型确定的岩石弹性模量或速度上限更接近实验测量数据,可为油田开发提供更合理的岩性模型参数。
The effects of effective pressure and lithology on Biot＇ s coefficient and rock elastic moduli were analyzed through experimental testing at simulated in-situ conditions （including temperature, and confining pressure） upon 87 samples of sandstone from the Palaeogene formation in Jiyang Sag and by combining with the core thin-section analysis results. It is concluded that Biot＇ s coefficient decreases as effective pressure and calcite cement content grow and increases with the increase of rock porosity, while rock elastic moduli become bigger as the effective pressure gets stronger. A Biot＇ s coefficient model and a relational model between rock elastic moduli and porosity are built. The upper limits of bulk modulus or compressional velocity calculated through the models are closer to the measurements of samples, proving that the model may yield more logical parameters for oil field development.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2008年第1期135-140,共6页
Oil & Gas Geology
基金
中国石化重点科技攻关项目(P01062)
关键词
Biot系数
有效压力
弹性模量
孔隙弹性
岩性
Biot＇ s coefficient
effective pressure
elastic modulus
pore elasticity
lithology
