曲方春,李斌会,王青振,佟斯琴,徐喜庆,郑策
QU Fangchun,LI Binhui,WANG Qingzhen,TONG Siqin,XU Xiqing,ZHENG Ce

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:黑龙江省油层物理与渗流力学重点实验室
• 3:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

松辽盆地古龙页岩油藏具有陆相纯页岩型储层，发育纳米级孔隙与页理缝系统，在降压开发过程中，页理缝应力敏感性较强、多相渗流机制复杂，制约了采收率的提升。针对页理缝系统应力敏感性及多相渗流规律等核心问题，开展了系统物理实验与数值模拟研究，通过裂缝闭合物理实验量化了有效应力对页理缝渗透率的损伤效应，并在此基础上建立了流固耦合数值模型，结合相场法揭示了裂缝内油-气-水三相渗流规律。结果表明：页理缝渗透率随有效应力的升高呈指数衰减，应力敏感系数达47.8 GPa~(-1)，当有效应力升至20 MPa时，渗透率损失为83%～94%；基于立方定律建立缝宽-密度-渗透率定量图版，量化不同页裂缝密度和宽度对渗透率的影响；缝宽收缩显著影响多相渗流行为，由于缝宽收缩造成绝对渗透率降低，油相、气相和水相的相对渗透率均增加。研究成果可为古龙页岩油藏能量补充方案设计及开发参数优化提供理论支撑。
Gulong shale oil reservoir in Songliao Basin exhibits continental pure shale reservoir, with nano-pores and a lamination-fracture system developed. During the process of depletion development, strong stress sensitivity of lamination fractures and complex multiphase flow mechanisms significantly constrain oil recovery enhancement. Aiming at the core issues of stress sensitivity and multiphase flow patterns within the lamination fracture system, systematic research is conducted using physical experiments and numerical simulation. Through fracture closure experiments, the damage effect of effective stress on lamination fractures permeabilities is quantified. On this basis, a fluid-solid coupling numerical model is established to reveal the oil-gas-water flow pattern within fractures by using phase-field method. The results show that, the permeability of the lamination fractures decreases exponentially with the increase of effective stress, exhibiting a stress sensitivity coefficient of 47.8 GPa~(-1). When effective stress increases to 20 MPa, the permeability loss reaches 83%-94%. Based on the cubic law, a quantitative chart of fracture width-density-permeability is established, quantifying the impact of fracture density and width on permeability. Fracture width contraction significantly affects multiphase flow behaviour. Due to the fracture width contraction, absolute permeability decreases, while the relative permeabilities of oil, gas and water phases increase. The research provides theoretical support for energy complement scheme design and development parameters optimization in Gulong shale oil reservoir.

关键词(KeyWords)： 多相渗流规律;页理缝;流固耦合;渗透率;应力敏感性;古龙页岩
multiphase flow pattern;lamellation fractures;fluid-solid coupling;permeability;stress sensitivity;Gulong shale

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“中高熟陆相页岩油富集理论与绿色有效开发基础研究”（U24B600404）;; 黑龙江省重点研发计划（创新基地）项目“多资源协同陆相页岩油绿色开采全国重点实验室”（JD2023GJ02）;; 国家科技重大专项“松辽盆地白垩系陆相页岩油勘探开发技术与集成示范”（2024ZD1404904）

作者(Author): 曲方春,李斌会,王青振,佟斯琴,徐喜庆,郑策
QU Fangchun,LI Binhui,WANG Qingzhen,TONG Siqin,XU Xiqing,ZHENG Ce

DOI: 10.19597/J.ISSN.1000-3754.202509045

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