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<p>Jimsar has good geologic conditions for shale oil development, but its shale oil reservoir mainly has some problems such as strong reservoir heterogeneity, low drilling efficiency, and difficult effective fracturing transformation of the reservoir, so efficient development requires more urgent engineering technology. Formation fracture is the key step of shale oil exploitation. To study the damage law of shale oil reservoir under explosion load, the parameters of Holmquist–Johnson–Cook (HJC) constitutive model of Jimsar shale oil reservoir are calculated by theoretical analysis and numerical simulation, and the coupling model of dynamic and static load of Jimsar shale oil reservoir is established by LS-DYNA software. The impact of load conditions such as explosive design quantity, borehole spacing, and explosion type on oil and gas recovery efficiency was discussed. Numerical simulation results show that when the TNT dosage is 324&#xa0;g and the borehole spacing is 480&#xa0;cm, the rock fragmentation and crack expansion around the boreholes are effective in improving economic benefits. In addition, using Density Functional Theory (DFT) to simulate the decomposition process of explosive molecules in the reservoir reveals that TNT easily undergoes degradation reactions with SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> with minimal pollution to the reservoir.</p>

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Study on Explosive Fracturing Mechanism of Jimsar Shale Oil

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • J. Luo,
  • R. D. Tian,
  • Y. T. Xu,
  • W. C. Yu,
  • D. Xiang,
  • H. R. Liu

摘要

Jimsar has good geologic conditions for shale oil development, but its shale oil reservoir mainly has some problems such as strong reservoir heterogeneity, low drilling efficiency, and difficult effective fracturing transformation of the reservoir, so efficient development requires more urgent engineering technology. Formation fracture is the key step of shale oil exploitation. To study the damage law of shale oil reservoir under explosion load, the parameters of Holmquist–Johnson–Cook (HJC) constitutive model of Jimsar shale oil reservoir are calculated by theoretical analysis and numerical simulation, and the coupling model of dynamic and static load of Jimsar shale oil reservoir is established by LS-DYNA software. The impact of load conditions such as explosive design quantity, borehole spacing, and explosion type on oil and gas recovery efficiency was discussed. Numerical simulation results show that when the TNT dosage is 324 g and the borehole spacing is 480 cm, the rock fragmentation and crack expansion around the boreholes are effective in improving economic benefits. In addition, using Density Functional Theory (DFT) to simulate the decomposition process of explosive molecules in the reservoir reveals that TNT easily undergoes degradation reactions with SiO2 and Al2O3 with minimal pollution to the reservoir.