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充填天然裂缝对页岩受载过程中渗透率变化规律影响机理分析 预览

THE INFLUENCE MECHANISM OF FILLED NATURAL FRACTURES ON THE VARIATION LAW OF SHALE PERMEABILITY IN LOADING PROCESS
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摘要 页岩气开采需要对储层进行大规模人工水力压裂改造,为了研究压裂过程中页岩渗透率变化规律及其机理,文章通过对含充填天然裂缝和不含天然裂缝两块页岩岩样进行流-固耦合物理模拟实验,并结合样品的全岩X-射线衍射分析,获得以下认识:加卸载过程中,应力-应变曲线中应力小平台的出现可以指示样品中微裂缝的形成与闭合,是渗透率变化的内在机制;当岩样达到破裂条件形成显裂缝后,样品发生永久性变形,从而达到渗透率增大的效果;受载过程中,微裂缝易沿着天然裂缝脆弱面发育,并不断积累连通成裂缝网络,是形成两块岩样渗透率变化差异的机理。 Shale gas exploitation requires large-scale artificial hydraulic fracturing of resevoirs.In order to study the variation law and mechanism of shale permeability during fracturing, fluid-solid coupling physical simulation experiments on two shale samples with and without filled natural fractures were carried out, and combined with the analysis of whole-rock X-ray diffraction of two samples, the following understandings were obtained:(1) During the loading and unloading process, the presence of small stress platforms in the stress-strain curve indicate the formation and closure of micro-fractures in the sample, which is the intrinsic mechanism of permeability change;(2) When the shale sample reaches the fracture condition to form visible fractures, the sample will be permanently deformed to increase the permeability.(3) In the process of loading, micro-fractures tend to develop along the fragile surface of natural fractures and continuously accumulate to form fracture networks, which is the mechanism for the difference of permeability changes between two shale samples.
作者 尚春江 康永尚 邓泽 赵群 王红岩 刘洪林 SHANG Chunjiang;KANG Yongshang;DENG Ze;ZHAO Qun;WANG Hongyan;LIU Honglin(School of Geosciences, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)
出处 《地质力学学报》 CSCD 2019年第3期382-391,共10页 Journal of Geomechanics
基金 国家科技重大专项(2017ZX05035-004-003,2016ZX05041-001)。
关键词 页岩气 流-固耦合 渗透率 天然裂缝 形成机理 shale gas fluid-solid coupling permeability natural fracture formation mechanism
作者简介 尚春江(1992-),男,在读硕士,主要从事非常规油气勘探开发方面的研究。E-mail:893604800@qq.com.
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