收稿日期:2013-10-05
基金项目:国家自然科学基金项目(41374124);国家重大科技专项(2011ZX05006-002)
作者简介:孙建孟(1964-),男,教授,博士生导师,从事测井资料处理、解释与岩石物理研究。 E-mail:sunjm@ upc. edu. cn。
摇 摇 文章编号:1673鄄5005(2014)03鄄0039鄄06摇 摇 摇 doi:10. 3969 / j. issn. 1673鄄5005. 2014. 03. 006
一基于数字岩心研究流体性质对裂缝性低渗透
储层弹性参数的影响规律
孙建孟
1
, 闫国亮
2
, 姜黎明
3
, 崔利凯
1
, 赵建鹏
1
, 崔红珠
4
(1. 中国石油大学地球科学与技术学院,山东青岛 266580; 2. 中国石油勘探开发研究院西北分院,甘肃兰州 730020;
3. 中国石油集团测井有限公司技术中心,陕西西安 710077; 4. 中国石油集团测井有限公司长庆事业部,陕西西安 710077)
摘要:为研究裂缝及流体性质对低渗透储层弹性参数的影响规律,采用 X 射线 CT 扫描技术构建低渗透储层岩石的 3
维数字岩心,应用图像处理算法加入定向排列的平行便士状裂缝,形成横向各向同性数字岩心,采用扩展的有限元
方法计算含有裂缝的数字岩心的弹性模量,分析裂缝及流体性质对其弹性模量的影响规律。 结果表明:裂缝纵横比
和密度保持不变,随流体体积模量的增加,纵波各向异性参数呈线性趋势减小;裂缝密度和流体性质不变,随裂缝纵
横比增加,储层岩石的弹性模量均呈线性增加;裂缝纵横比和流体性质不变,随裂缝密度增加,储层岩石的弹性模量
也呈线性减小。
关键词:测井; 裂缝性低渗透储层; 岩石性质; 弹性模量; 数字岩心; 有限元方法
中图分类号:TE 19摇 摇 摇 文献标志码:A
Research of influence laws of fluid properties on elastic parameters
of fractured low permeability reservoir rocks based on digital core
SUN Jian鄄meng
1
, YAN Guo鄄liang
2
, JIANG Li鄄ming
3
, CUI Li鄄kai
1
, ZHAO Jian鄄peng
1
, CUI Hong鄄zhu
4
(1. School of Geosciences in China University of Petroleum, Qingdao 266580, China;
2. Research Institute of Petroleum Exploration & Development鄄Northeast, PetroChina, Lanzhou 730020, China;
3. Technology Center, China Petroleum Logging Company Limited, Xi
謖
an 710077, China;
4. Changqing Division, China Petroleum Logging Company Limited, Xi
謖
an 710077, China)
Abstract: In order to investigate the effects of fracture and fluid properties on the elastic parameters of fractured low permea鄄
bility reservoirs, the digital cores of low permeability reservoirs were constructed by X鄄ray CT. The transversely isotropic dig鄄
ital cores with parallel penny shape cracks were firstly constructed using digital image processing technology, then the elastic
parameters of the cores were calculated by an extended finite element method, and lastly the effects of fracture and fluid prop鄄
erties on the elastic modulus were studied. The results show that with fixed crack aspect ratio and density, the longitudinal
wave anisotropy linearly decreases with the increase of the fluid bulk modulus. With fixed crack density and fluid properties,
the elastic moduli of fractured low permeability reservoir rock show a linear relationship with increasing crack aspect ratio.
And with fixed crack aspect ratio and fluid properties, the elastic moduli of fractured low permeability reservoir rock show a
linear relationship with increasing crack density.
Key words: well logging; fractured low permeability reservoir; rock properties; elastic modulus; digital core; finite element
method
摇 摇 由于定向应力的作用,低渗透储层存在的自然
裂缝或压裂缝通常表现为具有一定取向且相互平行
的裂缝模式,形成裂缝性低渗透储层
[1]
。 裂缝的存
在及裂缝中填充流体的性质对裂缝岩石的弹性性质
有重要的影响,会表现出大的地震各向异性。 定量
研究裂缝岩石弹性性质随所含流体变化的特征对于
2014 年摇 第 38 卷摇 摇 摇 摇 摇 摇 中国石油大学学报(自然科学版)摇 摇 摇 摇 摇 摇 摇 摇 Vol. 38摇 No. 3
摇 第 3 期摇 摇 摇 摇 摇 摇 摇 摇 Journal of China University of Petroleum摇 摇 摇 摇 摇 摇 摇 摇 Jun. 2014