上扬子地区牛蹄塘组黑色页岩的力学性质  

Mechanical property of Lower Cambrian Niutitang Formation black shale in upper Yangtze region,China

作　　者：杨迪[1] 刘树根[1] 单钰铭[1] 孙玮[1] 冉波[1] 罗超[1] 万洪程[2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中国石化华东分公司石油勘探开发研究院,南京210000

出　　处：《成都理工大学学报（自然科学版）》2013年第6期677-687,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：油气藏地质及开发工程国家重点实验室(成都理工大学)开放基金资助项目(PLC201107)

摘　　要：上扬子地区下寒武统牛蹄塘组黑色页岩是一套区域性的富有机质烃源岩。利用MTS岩石物理参数测试系统,通过模拟实际地层条件对研究区内2口钻井和2条地表实测剖面的岩石试样进行岩石力学测试,并与北美典型页岩岩石力学参数进行对比,结果表明:①黑色页岩破裂样式主要有拉伸破裂、单斜剪切破裂和共轭剪切破裂,随着围压的增大,岩石的破裂角度逐渐减小,以脆性-脆塑性变形为主;②页岩类型、埋藏深度、取心方位、地层水和加载条件对页岩的岩石力学参数有较大影响;③岩石抗压强度与剖面沉积背景具有一定的相关性;④岩石矿物组成也是影响抗压强度的另一主要因素。The black shale of the Lower Cambrian Niutitang Formation in the upper Yangtze region is a set of regional hydrocarbon source rocks rich in organic matter.Using MTS Rock Physical Parameter Automatic Testing System,the rock mechanical property of 2 wells and 2 measured sections are researched through simulating actual geological conditions.Then,a comparison between the mechanical parameters of North American typical shales and that of the Niutitang Formation black shale is made.The result shows the following conclusions.（1） The fracture patterns of the black shale are mainly the tensile shear failure,monoclinic shear failure and conjugate shear failure.With the confining pressure increases gradually,the rock rupture angle decrease.The rupture is mainly the brittle to brittle-plastic deformation.（2）The type and burial depth of the shale,the core orientation,formation water and the loading conditions have great influences on the rock mechanical parameters of the shale.（3） The compressive strength of rocks has some relationship with the sedimentary background.（4）The brittle mineral composition is another main factor influencing the compressive strength.

关 键 词：黑色页岩 岩石力学性质 牛蹄塘组 上扬子地区 

分 类 号：P588.22[天文地球—岩石学] TU458.3[天文地球—地质学]