鄂西渝东盖层碳质泥页岩的卸荷力学特性试验研究

doi:10.13722/j.cnki.jrme.2015.0148

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摘要隆升剥蚀过程可能导致鄂西渝东地区油气盖层破裂，油气散失。选取区域盖层碳质泥页岩，开展10，20，30，40，50 MPa五种不同初始围压下的三轴卸荷力学试验，研究隆升剥蚀对不同埋深岩石的影响。结果表明：岩石卸荷破坏时的轴向、径向变形随卸荷初始围压增大而增大；卸围压过程中卸载初始围压较小时，径向应变大于轴向应变，随初始围压增大，径向应变略小于轴向应变；卸荷试验获得到的泥页岩抗压强度与抗剪切参数均比常规三轴压缩试验高；岩石的破裂形式由低卸荷围压下的张性破裂向高卸荷围压下的剪切破坏过渡，在40 MPa时产生纵横切割试样的网状裂纹；提出侧压破裂系数初步评价区域盖层，结合鄂西渝东的抬升剥蚀量数据，推断石柱复向斜北部和方斗山复背斜以西是油气勘探容易取得突破地区，为区域油气勘探提供岩石力学依据。

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	霍亮1
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	袁玉松4

关键词 ：岩石力学, 鄂西渝东, 泥页岩, 盖层, 抬升剥蚀, 三轴卸载

Abstract：Western Hubei-Eastern Chongqing region is a major exploration block of oil and gas. The area has been suffered long term uplift and erosion，which may resulted in cap rock failure. To investigate the sealing effectiveness of cap rock during geological evolution，a series of triaxial unloading tests of shale samples have been conducted under initial confining pressures of 10，20，30，40，50 MPa. The results show that under different confining pressures，the unloading properties of carbonaceous shale are as follows. During unloading process，lateral strains are greater than axial strains under lower confining pressure，with the increase of confining pressure，lateral strains are less than axial strains；Strength values and strength parameters of unloading tests are both higher than those obtained from conventional triaxial compression tests；The fracture modes are obviously affected by the initial confining pressure：under low initial confining pressure，samples split into several large pieces；with the increasing of confining pressure，the fracture modes gradually transfer to main shear failure；under the confining pressure of 40 MPa，the fracture mode is characterized by occurrence of cracks-net；Also，rupture coefficient of lateral pressure is proposed to evaluate sealing effectiveness of cap rock. Based on the results of tests and erosion thickness of Western Hubei Eastern Chongqing area，we could conjecture that north of Shizhu composite anticline and west of Fangdou Mountain composites syncline are favorable place for exploration.

Key words： rock mechanics Western Hubei-Eastern Chongqing region shale cap rock erosion thickness triaxial unloading

引用本文:

霍亮1，杨春和1，2，冒海军2，刘俊新3，袁玉松4. 鄂西渝东盖层碳质泥页岩的卸荷力学特性试验研究[J]. 岩石力学与工程学报, 2016, 35(S1): 2898-2906.
HUO Liang1，YANG Chunhe1，2，MAO Haijun2，LIU Junxin3，YUAN Yusong4. Experimental research on mechanical properties of western Hubei-Eastern Chongqing carbonaceous shale cap rock under unloading stress path. , 2016, 35(S1): 2898-2906.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0148 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/2898

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