首页|储层温度对页岩微观力学性质的影响

储层温度对页岩微观力学性质的影响

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深部页岩气储层温度较高,为了研究地层温度对页岩宏微观力学性质的影响,采用四川盆地长宁区块寒武系龙马溪组井下页岩岩心,开展了 26℃、80℃、150℃条件下的网格式微米压痕实验,分别模拟地表、中深层与深部储层的环境温度.采用去卷积数据统计分析方法量化了温度对页岩微观力学性质的影响,结合能量分析法研究了温度对页岩微观尺度断裂韧性的影响规律,并分析了温度对深部页岩裂缝导流能力影响的作用机制.结果表明,随着深部储层温度的增加,显著削弱了页岩的微观弹性模量、硬度与断裂韧性,而增加了压痕点弹性变形能力;弹性变形能力的增强导致矿物簇受应力作用后具有恢复弹性形变的能力,进一步说明水力裂缝扩展后缝周矿物弹性形变易恢复,压裂裂缝难维持.该研究结果对从岩石微观力学角度理解深部页岩气储层水力裂缝导流能力低提供了理论支持.
The Influence of Reservoir Temperature on the Micromechanical Properties of Shale
The temperature of deep shale gas reservoir is high,in order to study the impact of formation tempera-ture on the macroscopic and microscopic mechanical properties of shale,the grid micro-indentation experiments at 26℃,80℃and 150℃were carried out to simulate surface,middle and deep reservoir temperature for the shale cores of the Cambrian Longmaxi Formation in Changning Block,Sichuan Basin.The influence of temperature on the microscopic mechanical properties of the shale rocks in the Longmaxi Formation was evaluated by using the deconvolution data statistical analysis method.The impact of temperature on micro-scale fracture toughness was illustrated through energy analysis,furthermore,the mechanism of temperature on the conductivity of deep shale fractures was analyzed.The results show that the temperature of deep reservoir significantly weakens the micro-e-lastic modulus,hardness and fracture toughness of shale;from the energy analysis,the proportion of elastic ener-gy in the total energy of the indentation point is positively correlated with the experimental temperature.It is proved that with the increase of the experimental temperature,the proportion of elastic energy in the total energy of the indentation point increases,which promotes the elastic deformation of the point.The enhancement of elas-tic deformation ability leads to the ability of mineral clusters to recover elastic deformation after being stressed,which further explains that the elastic deformation of minerals around fractures is easy to recover after the expan-sion of hydraulic fractures.The hydraulic fracture would be easy to close after opening and difficult to maintain.These research findings offer theoretical support for comprehending the low conductivity of hydraulic fractures in deep shale gas reservoirs from micro rock mechanics perspective.

deep shale gas reservoirreservoir temperaturerock mechanicsmicroindentationhydraulic fracture

程世忠、盛茂、任乐佳、王天宇、田守嶒、李根生

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油气资源与探测国家重点实验室

中国石油大学 北京

深部页岩气储层 储层温度 岩石力学 微米压痕 水力压裂裂缝

国家自然科学基金面上项目国家自然科学基金联合基金项目

52074315U19B6003-5

2024

钻采工艺
四川石油管理局钻采工艺技术研究院,西南油气田分公司采气工程研究院

钻采工艺

北大核心
影响因子:0.634
ISSN:1006-768X
年,卷(期):2024.47(1)
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