新场气田须五段岩石力学参数特征及测井解释  

The Rock Mechanics Characteristics and Its Logging Interpretation in the Fifth Member of Xujiahe Formation,Xinchang Gas Field

作　　者：徐浩[1] 谢润成[1,2] 杨松 姚勇[1] 张冲[1] 周文[1] 单钰铭[2] 

机构地区：[1]成都理工大学能源学院,成都610059 [2]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [3]山东省东营市海洋采油厂采油工艺监督中心,东营257237

出　　处：《科学技术与工程》2015年第8期17-22,65,共7页Science Technology and Engineering

摘　　要：针对川西新场气田须五段储层泥页岩与砂岩储层互层,孔隙度、渗透率较低等特点,实验室内选取须五段地层砂/泥岩样式,利用"MTS岩石物理参数测试系统",模拟实际地层条件下岩样的岩石力学特征,结合普通薄片、铸体薄片等方法对砂、泥岩分别进行岩石力学性质的研究。实验研究表明:三轴条件下,砂泥岩的应力-应变曲线有一定差异,岩石总体表现为弹-塑性变形;抗压强度与围压、杨氏模量成正相关;泥岩地层具有较大的塑性,砂岩显示相对刚性。此外,利用测井和薄片数据,区分砂/泥岩提取了须五段测井纵横波时差校对关系,拟合出弹性模量和泊松比的动静转换公式;通过岩石密度、波阻抗和泥质指数得出抗压强度计算公式,抗张强度由抗压强度拟合得出,内聚力和内摩擦角利用修正后的经验公式计算,在此基础上构建了岩石力学参数测井解释剖面。研究成果对今后该地区的页岩气储层裂缝产生原因分析及气田的压裂优化设计提供了重要依据。There exist complicated mixtures of sandstone and shale in the fifth member of Xujiahe Formation.And it has the low porosity and permeability of the reservoir. Based on sampling of the Lower sandstone and shale,MTS petrophysics test system,ordinary thin and casting thin,it analyzed the characteristics of the sandstone and shale. The test indicates that the stress-strain relation is different between sandstone and shale,the rock trends to display to elastic-plastic deformation; the compressive strength has the positive proportion with confinement pressure and elastic modulus; the shale trends to plastic deformation,whereas the sandstone trends to rigid deformation.Based on the thin and logging interpretation,it matches the formula of dynamic Young＇s modulus and Poisson＇s ratio; calculates the compressive strength from density,elastic impedance and shale contents; matches the tensile strength with compressive strength; calculates shearing strength with empirical formula; and finally builds up the rock mechanics logging interpretation sections of the fifth member of Xujiahe Formation. The research provides reference to subsequent engineering research,such as fracture analysis and fracturing treatment.

关 键 词：岩石力学性质 弹-塑性变形 测井解释 须五段 新场气田 

分 类 号：P555[天文地球—构造地质学]