库车河剖面砾岩层的岩石力学性质

新疆大北-博孜区块为典型的砾岩发育区块,钻井过程中井下事故的频发,对该地区油气储层地的开发产生了很大的影响.开展该区域砾岩岩石力学性质研究是非常有意义的.结合微组构测试与室内岩石力学实验,对大北-博孜地区库车河剖面砾岩开展岩石力学性质分析,并研究了微组构对砾石层力学性质的影响.研究结果表明:库车河剖面砾岩层力学参数同层差距较小,不同层位之间差距较大;在分析影响砾石层力学性质方面,对比发现砾石层的力学性质与粒度组成成反比,与胶结的致密程度成正比,且灰质胶结含量越高、泥质胶结含量越低的地层,弹性模量值、单轴抗压强度值越大,泊松比越小,对应砾岩层越不容易发生破坏.

Study on Rock Mechanical Properties of Conglomerate Layer of Kuchehe Section

The Dabei-Bozi block is a typical conglomerate development block in Xinjiang province. Downhole accidents occur frequently during drilling. It is of great significance to carry out research on the mechanical properties of conglomerate rocks in this area. Combining the microstructure test and the laboratory rock mechanics experiment, the rock mechanical properties of the conglomerate in Kuchehe section of Dabei-Bozi area were analyzed, and the influence of microstructure on the mechanical properties of the gravel layer was studied. The results of the study indicate that the gap between the mechanical parameters of the conglomerate layer in the Kuchehe section is smaller and the gap between different layers is larger. In terms of analyzing the mechanical properties of the gravel layer, it is found that the particle size composition of the gravel layer is inversely proportional to the mechanical properties. The formation with a higher degree of cementation is proportional to the degree of cementation, and the higher the elastic modulus value, the stronger the compression resistance.