(1. State Key Laboratory of Petroleum Resources and Prospecting，China University of Petroleum，Beijing 102249，China；
2. Key Laboratory of Petroleum Engineering of Ministry of Education，China University of Petroleum，Beijing 102249，China；
3. Petroleum Production Engineering institute of PetroChina Huabei Oilfield Company，Renqiu，Hebei 062552，China)
Abstract：Clay-rich shale rock reveals greater compressibility than tight sandstone. Experiments have been conducted on Liupanshan—Yabrai shale core samples to select appropriate correlations to represent permeability as a function of effective stress. Mineralogical，mechanical properties and microscopic pore structure were analyzed by rock dynamics mechanics experiments，X-ray diffraction analysis，field emission scanning electron microscope image analysis and high pressure mercury injection to investigate stress sensitivity mechanism of shale reservoir. The results show that the exponentiation curve fit the relationship of effective stress and permeability well；The core with high clay content，low Young?s modulus present relative high stress-sensitivity and larger stress-sensitivity coefficient；shale reservoirs with nanoslot pores and throats exhibit highly stress-sensitive because of the irreversible deformation of easy-compressed throats. An increase in mesopore permeability contribution is correlated with an increase in stress sensitivity.
邹才能，李建忠，董大忠，等. 中国首次在页岩气储集层中发现丰富的纳米级孔隙[J]. 石油勘探与开发，2010，37(5)：508-509.(ZOU Caineng，LI Jianzhong，DONG Dazhong，et al. Types，characteristics，genesis and prospects of conventional and unconventional hydrocarbon accumulations：taking tight oil and tight gas in China as an instance[J]. Acta Petrolei Sinica，2010，37(5)：508-509.(in Chinese))
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2015, Vol. 34 
