Stress sensitivity analysis of the shale reservoir by the quartet structure generation set
Received date: 2019-01-08
Revised date: 2019-04-16
Online published: 2019-10-14
The stress sensitivity of permeability in the shale reservoir is the key factor influencing its later development effect. It is of great significance for shale gas development to deeply understand its stress sensitivity mechanism and its influencing factors from the microscopic point of view. In this paper, core samples with different porosity and pore size distribution are constructed by means of the quartet structure generation set. The variation of pore radius distribution and its influence on intrinsic permeability of cores under different effective stress are simulated by using elasticity theory. The relationship between pore size and shape factor and the above two parameters is deeply analyzed. The results show that the direct cause of shale stress sensitivity is the decrease of pore area and the migration of pore position under effective stress. With the increase of effective stress, the pore radius decreases. The proportion of reduction of pore radius is positively and negatively correlated with the initial pore area and the pore shape factor, respectively. Under the same porosity condition, the more uniform the pore radius, the stronger the stress sensitivity. With the increase of effective stress, the intrinsic permeability of core decreases exponentially, and the smaller the porosity and the lower the intrinsic permeability, the stronger the stress sensitivity of core, and the effect of porosity on intrinsic permeability is obviously greater than that of pore radius uniformity.
Jia-xiang Xu , Li-feng Yang , Yun-hong Ding , Zhe Liu , Rui Gao , Zhen Wang . Stress sensitivity analysis of the shale reservoir by the quartet structure generation set[J]. Natural Gas Geoscience, 2019 , 30(9) : 1341 -1348 . DOI: 10.11764/j.issn.1672-1926.2019.04.014
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