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| Microfabric characteristics of tight sandstone of Xujiahe formation in western Sichuan after high temperature and the effect on mechanical properties |
| ZHANG Yi1，LI Gao1，WANG Xiyong2，CHEN Ze1，LI Ze1，WANG Rui1 |
(1. State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu，Sichuan 610500，China；2. Petroleum Engineering Technology Research Institute，Sinopec Southwest Oil and Gas Company，
Guanghan，Sichuan 618300，China) |
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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.
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2021, Vol. 40 
