KS地区砾岩地层岩石力学特性试验研究  

Experimental Study on the Mechanical Properties of the Rocks in the Conglomerate Formation of the KS Area

作　　者：张重阳 熊健[1] 梁利喜[1] 刘向君[1] 张旭[1] ZHANG Chong-yang;XIONG Jian;LIANG Li-xi;LIU Xiang-jun;ZHANG Xu(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500

出　　处：《科学技术与工程》2020年第27期11038-11044,共7页Science Technology and Engineering

基　　金：国家科技重大专项(2016ZX05051004008,2017ZX05070001-002)。

摘　　要：以KS地区的砾岩研究对象,通过XRD衍射、孔渗测试、岩石力学实验研究了该地区砾岩地层的基础物性、力学特性。研究结果表明:砾岩砾石颗粒主要由泥晶灰岩和灰质云岩组成,基质主要由碳酸盐岩、黏土矿物、石英和长石类矿物组成;砾石和基质强度差异较大,砾石的压入硬度分布在569.39~1379.33 MPa,平均值为973.46 MPa,是基质硬度的2~3倍;砾岩地层的岩石力学参数变化范围大,砾岩未浸泡钻井液条件下,单轴抗压强度分布在59.74~75.5 MPa,而浸泡现场钻进液后砾岩抗压强度下降较明显,下降幅度约为42.7%;砾岩脆性较强,且在浸泡钻井液后脆性更明显。砾岩的非均质性比较强,其力学特性受到砾石和基质影响;钻井液对砾岩的力学性能影响较明显,钻井过程井壁稳定性应考虑砾岩与钻井液间的物理化学作用的影响。The basic physical and mechanical properties of conglomerate formations in the KS Area were studied by the XRD analysis in rock mechanics experiment.The results show that the gravels of the conglomerates are mainly micritic limestone and dolomitic limestone and the matrix is mainly consist of carbonate,clay,quartz,and feldspar.The difference in strength is significant between gravels and matrix.The compressive hardness of the gravels ranged 569.39~1379.33 MPa on average of 973.46 MPa,which is 2~3 times that of the matrix.The rock mechanical parameters of the conglomerate vary widely.The compressive strength of the conglomerate ranged 59.74~75.5 MPa before soaked in drilling fluid.However,the compressive strength of the conglomerates decreased significantly(about 42.7%)after soaked in drilling fluid.The brittleness of conglomerate is relatively high.After being with drilling fluid,the brittleness became more obvious.As the conglomerate is very inhomogeneous,thus,its mechanical properties are affected by internal gravel and matrix.The influence of drilling fluid on the mechanical properties of conglomerate was obvious,and the influence of physical and chemical interaction between conglomerate and drilling fluid should be considered for wellbore stability during drilling.

关 键 词：砾岩 岩石力学实验 基础物性 力学特性 

分 类 号：TD313[矿业工程—矿井建设]