川西须家河组致密砂岩高温后微组构特征及对力学性能的影响

doi:10.13722/j.cnki.jrme.2021.0135

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摘要高温热处理致密砂岩能改善其渗流能力，是致密气开发的潜在技术，但同时会改变岩石力学特性，导致井壁失稳等工程问题。选取川西须家河组致密砂岩试样，对常温及100 ℃～1 200 ℃热处理后的试样开展三轴压缩实验，结合热失重分析、X射线衍射(XRD)、扫描电子显微镜(SEM)获取的微组构特征，探究致密砂岩高温后微组构特征及其对力学性能的影响。研究表明：随温度升高，微裂纹萌生与扩展机制包括黏土失水收缩扩大喉道、片状伊利石剥离、长石解理面分离、微裂纹沿晶间扩展形成网络并逐渐诱导产生更小尺度微裂纹网络、颗粒内部崩裂形成层状裂纹等；在裂纹损伤温度区(400 ℃～1 000 ℃)，试样在外力作用下更易破坏，压密、弹性阶段扩大；在常温～200 ℃，300 ℃～1 000 ℃以及1 100 ℃～1 200 ℃范围，分别由矿物热膨胀、热诱导微裂纹产生与扩展、试样釉化等物理过程主导岩石力学性能的变化，导致抗压强度、弹性模量呈现出先上升，再降低，后回升的趋势；400 ℃热处理后黏土矿物失去层间水，收缩形成绒球状，对孔喉充填作用更强，导致抗压强度、弹性模量呈现异常高值，绿泥石高温(800 ℃)脱水对试样脆性的提高抑制了弹性模量的降低。

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	张毅1
	李皋1
	王希勇2
	陈泽1
	李泽1
	王睿1

关键词 ：岩石力学, 致密砂岩, 热处理, 力学性能, 微组构

Abstract：Heat treatment，as a potential tight gas development technique，can improve the seepage capacity of tight sandstone，while will change the rock mechanical behaviors leading to the instability of well walls. In this paper，triaxial compression experiments were carried out on the tight sandstone samples from the Xujiahe Formation in western Sichuan at room temperature and after 100 ℃‐1 200 ℃ heat treatment，and the effects of the microfabric characteristics of tight sandstone after high temperature on the mechanical properties were explored combined with DTG，XRD and SEM. The results show that with increasing the temperature，the mechanisms of microcrack initiation and propagation present clay contracts due to water lose，lamellar illite dissection，cleavage surface separation of feldspar，microcracks propagation along the intergranular and forming a network，cracking and cambium forming lamellar cracks inside the particles. In the crack damage temperature range(400 ℃‐
1 000 ℃)，the specimen is more prone to failure under external forces，and the compaction and elastic stages expand. In the ranges of room temperature ‐200 ℃，300 ℃‐1 000 ℃ and 1 100 ℃‐1 200 ℃，mineral thermal expansion，thermal induced microcrack generation and expansion，sample glazing and other physical processes dominate the change of rock mechanical properties，respectively，leading to that the compressive strength and the elastic modulus first increase，then decrease and then rise again. After heat treatment at 400 ℃，the clay minerals lose interlayer water and shrink into pongy balls，resulting in abnormally high compressive strength and elastic modulus. The dehydration of chlorite at 800 ℃ increases the brittleness of the samples and inhibits the decrease of the elastic modulus.

Key words： rock mechanics tight sandstone heat treatment mechanical properties microfabric

引用本文:

张毅1，李皋1，王希勇2，陈泽1，李泽1，王睿1. 川西须家河组致密砂岩高温后微组构特征及对力学性能的影响[J]. 岩石力学与工程学报, 2021, 40(11): 2249-2259.
ZHANG Yi1，LI Gao1，WANG Xiyong2，CHEN Ze1，LI Ze1，WANG Rui1. Microfabric characteristics of tight sandstone of Xujiahe formation in western Sichuan after high temperature and the effect on mechanical properties. , 2021, 40(11): 2249-2259.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0135 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I11/2249

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